Wiring circuit

Showing posts with label audio. Show all posts

Showing posts with label audio. Show all posts

Thursday, October 30, 2014

LED Audio Level Meter Circuit

This circuit uses two quad op-amps to form an eight LED audio level meter. The op-amp used in this particular circuit is the LM324. It is a popular IC and should be available from many parts stores.

LED audio level meter schematic

The 1K resistors in the circuit are essential so that the LEDs turn on at different audio levels. There is no reason why you cant change these resistors, although anything above 5K may cause some of the LEDs to never switch on. This circuit is easily expandable with more op-amps, and is not limited to use with the LM324. Pretty much any op-amp will work as long as you look up the pinouts and make sure everything is properly connected.

The 33K resistor on the schematic is to keep the signal input to the circuit at a low level. It is unlikely you will find a 33K resistor, so the closest you can get should do. The value of this resistor may need to be changed, so it is best you breadboard this circuit before actually constructing it on PCB. The circuit in its current form will accept line level inputs from sources such as the aux out on a Hi-Fi, all though could be easily modified to accept speaker inputs.

The audio + is connected to the main positive rail, while the audio - is used for signal input. The 50k pot can be used to vary the sensitivity of the circuit.

Sunday, October 26, 2014

25W Hi Fi Audio Amplifier LM1875

This circuit is the audio amplifier circuit has a very all the rage single.This is a down-to-earth circuit. miniature pieces of equipment. And Watt are climax.The circuit uses IC figure LM1875, which is under the protection circuit IC output before Too tiny circuit. And a important distortion because low as 0.015% on a frequency of 1kHz.

25W Hi-Fi Audio Amplifier Circuit Diagram

This circuit uses helpful, unconstructive ground power supply to move the audio show with both halves of the signal swing, positive and negative halves,The sound so as to came not permitted rock apparent.production is. as soon as paying into the audio input. Audio is through R1, R2, C1 and R3 to limit the audio sign appropriately.And limit the racket to the input signal assorted down to the ground.next sends a signal to racket to the input pin of IC 1.A noninterting pin, amplifier non-return time.Out of the 4 output pins to access the speakers.The R6 and C4 eliminate racket miscellaneous with the output down to the ground.And a new part of the audio output pin 4 of integrated circuit bidding befall fed back into place through R5 to pin 2, which R4 and R5 determines the rate of boost up, can be calculated from R5/R4,will expansion equal to 15 era, With a C2 to experience high-pitched frequencies better.

Antenna Input Audio Lineout Adaptor For Portable Radios

Here is an idea for a simple low-cost adaptor that allows a portable FM radio (or MP3 player with FM tuner) to be connected to an external antenna and to audio equipment such as a hifi system or PC sound card. Portable FM radios and some MP3 players typically provide a 3.5mm stereo jack socket for the headphone connection, with the shield conductor of the headphone cable doubling as an antenna.

The problem:

Recently, the author bought a cheap FM radio with a USB connector, designed to be operated with a PC. The package included an audio cable with a 3.5mm stereo phone plug at each end. The plug that goes into the radio has an additional wire (about 2m long) hanging out of it, which is meant to serve as an indoor antenna. When using the supplied cable, the system suffered from poor radio reception (too much interference), and poor audio quality (lack of bass). The first problem was easily explained, as the radio was used in a marginal TV/FM reception area. When the cable was "buzzed out", the reason for the second problem became apparent.

There was no audio ground connection, as the cable screen is not connected to anything at the radio end! As mentioned, the antenna wire in these units is connected to the "common" terminal of the 3.5mm socket, which normally doubles as the audio signal return path. If this terminal were to be connected to the ground of external audio equipment, the antenna signal would be clobbered. Perhaps the designer of this cable assumed that an adequate audio ground connection would be made indirectly via the USB cable – a poor assumption!

Circuit diagram:

The challenge:

The challenge then was to provide a good antenna signal for the radio while at the same time making a good audio ground connection to external equipment. Preferably, this was to be achieved without relying on the USB connector (because not all FM radios have one) and without having to mess with the radio’s internal works. The accompanying circuit diagram shows how this can be achieved. The radio-frequency choke (L1) has a low impedance at audio frequencies, thereby making an audio ground path to the line output sockets from the radio’s antenna input ("common" terminal).

Conversely, the RFC presents a high impedance to the RF antenna signal, so preventing it from being shorted to ground. The antenna signal is coupled to the radio via two 220pF polystyrene (or ceramic) capacitors, which also block low-frequency interference (eg, mains hum). Note that the design relies on the capacitance in the audio cable to couple the antenna "ground" (cable shield) to the radio’s internal "ground".

Building it:

To build the adaptor, simply mount the parts in a small plastic box and wire up as shown. A suitable choke is available from Jaycar (Cat. No. LF-1534). The leads going to the 3.5mm plug should be no longer than about 100mm and need not be shielded. With a good TV/FM antenna, the author’s unit performed remarkably well, even in a poor FM reception area. The audio frequency response and signal-to-noise ratio were surprisingly good considering the low cost of the radio (about $40).
Author: Michael Bauer - Copyright: Silicon Chip Electronics

Saturday, October 25, 2014

25 Watt Audio Amplifier Circuits Diagram

25 Watt Audio Amplifier Circuits Diagram

25 Watt Audio Amplifier Circuits Diagram

Parts:

R1,R4_________47K  1/4W Resistors

R2____________4K7  1/4W Resistor

R3____________1K5  1/4W Resistor

R5__________390R   1/4W Resistor

R6__________470R   1/4W Resistor

R7___________33K   1/4W Resistor

R8__________150K   1/4W Resistor

R9___________15K   1/4W Resistor

R10__________27R   1/4W Resistor

R11_________500R   1/2W Trimmer Cermet

R12,R13,R16__10R   1/4W Resistors

R14,R15_____220R   1/4W Resistors

R17___________8R2    2W Resistor

R18____________R22   4W Resistor (wirewound)

C1___________470nF  63V Polyester Capacitor

C2___________330pF  63V Polystyrene Capacitor

C3,C5________470µF  63V Electrolytic Capacitors

C4,C6,C8,C11_100nF  63V Polyester Capacitors

C7___________100µF  25V Electrolytic Capacitor

C9____________10pF  63V Polystyrene Capacitor

C10____________1µF  63V Polyester Capacitor

Q1-Q5______BC560C   45V 100mA Low noise High gain PNP Transistors

Q6_________BD140    80V 1.5A PNP Transistor

Q7_________BD139    80V 1.5A NPN Transistor

Q8_________IRF530  100V 14A N-Channel Hexfet Transistor

Q9_________IRF9530 100V 12A P-Channel Hexfet Transistor

Power supply circuit diagram

Parts:

R1____________3K3 1/2W Resistor C1___________10nF 1000V Polyester CapacitorC2,C3______4700µF 50V Electrolytic CapacitorsC4,C5_______100nF 63V Polyester Capacitors D1__________200V 8A Diode bridgeD2__________5mm. Red LED F1,F2_______3.15A Fuses with sockets T1__________220V Primary, 25 + 25V Secondary 120VA Mains transformer PL1_________Male Mains plug SW1_________SPST Mains switch

Notes:

Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log potentiometer (dual gang for stereo) and a switch to cope with the various sources you need.
Q6 & Q7 must have a small U-shaped heatsink.
Q8 & Q9 must be mounted on heatsink.
Adjust R11 to set quiescent current at 100mA (best measured with an Avo-meter connected in series to Q8 Drain) with no input signal.
A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of R1, R4, R9, C3 to C8. Connect C11 to output ground. Then connect separately the input and output grounds to power supply ground.
An earlier prototype of this amplifier was recently inspected and tested again after 15 years of use.

Technical data:

Output power:

well in excess of 25 Watt RMS @ 8 Ohm (1KHz sine wave)

Sensitivity:

200mV input for 25W output

Frequency response:

30Hz to 20KHz-1dB

Total harmonic distortion @ 1KHz:

0.1W 0.014% 1W 0.006% 10W 0.006% 20W0.007% 25W 0.01%

Total harmonic distortion @10KHz:

0.1W 0.024% 1W 0.016% 10W 0.02% 20W0.045% 25W 0.07%

Unconditionally stable on capacitive loads

Friday, October 24, 2014

25 Watt Audio Amplifier Circuits Diagram

25 Watt Audio Amplifier Circuits Diagram

25 Watt Audio Amplifier Circuits Diagram

Parts:

R1,R4_________47K  1/4W Resistors

R2____________4K7  1/4W Resistor

R3____________1K5  1/4W Resistor

R5__________390R   1/4W Resistor

R6__________470R   1/4W Resistor

R7___________33K   1/4W Resistor

R8__________150K   1/4W Resistor

R9___________15K   1/4W Resistor

R10__________27R   1/4W Resistor

R11_________500R   1/2W Trimmer Cermet

R12,R13,R16__10R   1/4W Resistors

R14,R15_____220R   1/4W Resistors

R17___________8R2    2W Resistor

R18____________R22   4W Resistor (wirewound)

C1___________470nF  63V Polyester Capacitor

C2___________330pF  63V Polystyrene Capacitor

C3,C5________470µF  63V Electrolytic Capacitors

C4,C6,C8,C11_100nF  63V Polyester Capacitors

C7___________100µF  25V Electrolytic Capacitor

C9____________10pF  63V Polystyrene Capacitor

C10____________1µF  63V Polyester Capacitor

Q1-Q5______BC560C   45V 100mA Low noise High gain PNP Transistors

Q6_________BD140    80V 1.5A PNP Transistor

Q7_________BD139    80V 1.5A NPN Transistor

Q8_________IRF530  100V 14A N-Channel Hexfet Transistor

Q9_________IRF9530 100V 12A P-Channel Hexfet Transistor

Power supply circuit diagram

Parts:

R1____________3K3 1/2W Resistor C1___________10nF 1000V Polyester CapacitorC2,C3______4700µF 50V Electrolytic CapacitorsC4,C5_______100nF 63V Polyester Capacitors D1__________200V 8A Diode bridgeD2__________5mm. Red LED F1,F2_______3.15A Fuses with sockets T1__________220V Primary, 25 + 25V Secondary 120VA Mains transformer PL1_________Male Mains plug SW1_________SPST Mains switch

Notes:

Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log potentiometer (dual gang for stereo) and a switch to cope with the various sources you need.
Q6 & Q7 must have a small U-shaped heatsink.
Q8 & Q9 must be mounted on heatsink.
Adjust R11 to set quiescent current at 100mA (best measured with an Avo-meter connected in series to Q8 Drain) with no input signal.
A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of R1, R4, R9, C3 to C8. Connect C11 to output ground. Then connect separately the input and output grounds to power supply ground.
An earlier prototype of this amplifier was recently inspected and tested again after 15 years of use.

Technical data:

Output power:

well in excess of 25 Watt RMS @ 8 Ohm (1KHz sine wave)

Sensitivity:

200mV input for 25W output

Frequency response:

30Hz to 20KHz-1dB

Total harmonic distortion @ 1KHz:

0.1W 0.014% 1W 0.006% 10W 0.006% 20W0.007% 25W 0.01%

Total harmonic distortion @10KHz:

0.1W 0.024% 1W 0.016% 10W 0.02% 20W0.045% 25W 0.07%

Unconditionally stable on capacitive loads

Low distortion audio amplifier

This is an unusual circuit for an ultra-low distortion power amp. According to my original notes the circuit is dated January 1977 so the circuit is not exactly modern but it is still sufficiently different to be interesting. The circuit was designed and sold as a card by a purveyor of surplus components but, even using mostly manufacturers rejected transistors, we managed to get about 0.02% total harmonic distortion at 30 watts with a ±25v power supply into 8 ohms.: no bad figure even in these days of MOSFET and ICs. In 1977 anything below 0.1% was considered excellent. And this figure was pretty repeatable without doing much selection.
The problem of course is that since I havent touched this amplifier for many a year I have absolutely no idea what modern transistor types one should use for it but they are not critical: output transistors and drivers need to be the correct type but the other transistors can be small signal types - as long as they can handle the full voltage between + and - supplies.
Circuit: pwramp.gif

Circuit: pwramp.gif

Tr1 and Tr2 are a long-tailed pair (LTP to save typing). It is quite common to have a LTP in an audio amp but this is different: this is a complimentary LTP. As far as I am aware no one else had used a complimentary LTP at the time, though I have since seen it used in one other circuit. So I guess the circuit is unique to the author. One of the things that limits the performance of a conventional LTP is that the tail source loads the common emitters. In a complementary LTP this cant happen as there is no tail current source so that all the current of one transistor has to flow through the other.

Tr2s collector current flows into D1 and D2 which develop a voltage: this is used to bias Tr8 as a constant current source for Tr4s collector. The fact that Tr4 is working at a constant current defines its base-emitter voltage which must be developed across R4. This defines a current in R4 and this is the current that the LTP must operate at - so the ring of four transistors (Tr1, 2, 3, & 4) is self biasing and all transistors work at their best with minimum unwanted loads and biasing detracting from the performance. Tr4 is actually one of the most critical transistors: in the original circuit it was selected for Vce greater than 75v. Most Texas BC212s passed easily. Lower voltage transistors caused an increase in distortion level.

There is always a down side to any circuit: in the conventional LTP the base-emitter voltages tend to cancel each other out. In the complimentary LTP they add so there is a drop of about 1.2v between the two bases: this must be cancelled in the biasing chain and, since this circuit was designed for operation over a wide range of supply voltage, I had to be a little clever. Because of the constant current operation of the LTP and the constant voltage drop across D1 & D2, there is also a constant voltage across R14. This drop is used to lift up the bottom of the biasing chain (R1 and R11) so that the output sits at around half supply voltage, over a wider supply range.

D3 and D4 develop a bias voltage so that the output transistors are at the correct point, slightly conducting, to minimise crossover distortion.

The output transistors are complimentary (the original design used MJE2011 and MJE2021) and are driven by complimentary drivers: PNP driving NPN and vice versa. This arrangement is not only pleasingly symmetrical but gives better performance that the more common Darlington arrangement - the full gain of all the transistors is used and there is more internal feedback and less voltage drop.

The output current is monitored in the two resistors R7 and R22 (180 milliohms). The current limiting is unusual in that it works inside the input ring at an earlier stage than normal. This has an advantage that the current limiting transistors do not load the drive circuitry - which will introduce distortion. The slight down side is that there may be a slight tendency to oscillation when in current limit. R3 and R14 are necessary to restrict the current availability when the current limit engages. R5 and R19 are present to make the current limit vary with the voltage across the power transistors to avoid the second breakdown region of power transistors.

The points shown connecting terminals 1-2 and 6-7 are scratch-through tracks. 1 and 2 are the power and signal earths: to keep distortion in a stereo system to a minimum the currents in these must never share the same path so in a stereo system four earth wires are run to the systems common earth point - a spider common earth - and this means breaking the link. The link between 6 & 7 is in the feedback path and there are times when this can usefully be broken - one cheapskate was to fit a tone control circuit here (see below). It works fine but is a bit of an insult to such a low-distortion design!. A third break point is in the collector of Tr2. Breaking this shuts down the amplifier completely and safely. Is a thermal switch is to be fitted, this is the place.

Overall negative feedback is in two parts: D.c. is fed back via R13: there is 100% d.c. feedback. A.c. feedback is via R12 and R17. Note the output capacitor is inside this feedback loop (speaker connects between terminal 5 and negative) which extends the low frequency response.

Another feature is the accessibility of both ends of the output coupling capacitor: being designed for a junk shop, they didnt want to use expensive capacitors! So for extra bass performance an additional capacitor can easily be connected.

The circuit can also be driven as a low input impedance: break 6-7, short pin 8 to C4s positive and apply input to pin 6. In this mode the input distortion is actually better: my original notes show as low as 0.01%!

When building a low-distortion amplifier, layout is vital. In fact to get distortion around 0.02% requires a lot of skill and experience. The problem is that the current in the output stage alternates between the two power transistors so is a rectified version of the input. Now there is no such thing as a wire. Any real piece of wire or copper track is a resistor with associated inductance and capacitance. If the high current, rectified output signal mixes in the same piece of wire with the input signal the distortion in the rectified output current will feed into the input and cause the overall distortion to rocket. This is something which cannot properly be taught but has to be experienced. A skilled audio engineer will spend his lifetime learning about it.

Source by : http://www.4qdtec.com/pwramp.html

Thursday, October 23, 2014

Build a 18W Audio Amplifier Circuits Diagram

18W Audio Amplifier Circuits Diagram

Amplifier parts:

P1_____________22K  Log. Potentiometer (Dual-gang for stereo)

R1______________1K  1/4W Resistor

R2______________4K7 1/4W Resistor

R3____________100R  1/4W Resistor

R4______________4K7 1/4W Resistor

R5_____________82K  1/4W Resistor

R6_____________10R  1/2W Resistor

R7_______________R22  4W Resistor (wirewound)

R8______________1K  1/2W Trimmer Cermet (optional)

C1____________470nF  63V Polyester Capacitor

C2,C5_________100µF   3V Tantalum bead Capacitors

C3,C4_________470µF  25V Electrolytic Capacitors

C6____________100nF  63V Polyester Capacitor

D1___________1N4148  75V 150mA Diode

IC1________TLE2141C  Low noise, high voltage, high slew-rate Op-amp

Q1____________BC182  50V 100mA NPN Transistor

Q2____________BC212  50V 100mA PNP Transistor

Q3___________TIP42A  60V 6A    PNP Transistor

Q4___________TIP41A  60V 6A    NPN Transistor

J1______________RCA  audio input socket

Power supply parts:

R9______________2K2 1/4W Resistor

C7,C8________4700µF 25V Electrolytic Capacitors

D2_____________100V 4A Diode bridge

D3_____________5mm. Red LED

T1_____________220V Primary, 15 + 15V Secondary, 50VA Mains transformer

PL1____________Male Mains plug

SW1____________SPST Mains switch

Notes:

Can be directly connected to CD players, tuners and tape recorders.
Do not exceed 23 + 23V supply.
Q3 and Q4 must be mounted on heatsink.
D1 must be in thermal contact with Q1.
Quiescent current (best measured with an Avo-meter in series with Q3 Emitter) is not critical.
Adjust R3 to read a current between 20 to 30 mA with no input signal.
To facilitate quiescent current setting add R8 (optional).
A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of J1, P1, C2, C3 & C4. Connect C6 to the output ground.
Then connect separately the input and output grounds to the power supply ground.

Technical data:

Output power:

18 Watt RMS into 8 Ohm (1KHz sine wave)

Sensitivity:

150mV input for 18W output

Frequency response:

30Hz to 20KHz-1dB

Total harmonic distortion @ 1KHz:

0.1W 0.02% 1W 0.01% 5W 0.01% 10W0.03%

Total harmonic distortion @10KHz:

0.1W 0.04% 1W 0.05% 5W 0.06% 10W0.15%

Unconditionally stable on capacitive loads

Audio Peak Indicator Circuit

The existence of the peak indicator "Audio Peak Indicator" in an audio device is needed. Audio Peak indicator is a simple circuit to detect the peak level of audio signal. Audio Peak indicator circuit is built with duabuah transistor and LED indicator as peak level detection of audio signals.

The main function of a series of Audio Peak indicator is to determine the occurrence of the peak level of audio signal that is more than +4 dB, equivalent to 1.25 V rms. If the received audio signal Audio Peak Indicator more than +4 dB was the LEDs in series Peak Audio This indicator will light. Audio Peak indicator circuit is mounted on the output audio system.

Audio Peak Indicator Component List:
R1 = 10Kohm
R2 = 1.2Kohm
R3 = 220Kohm
R4-5 = 4.7Kohm
C1 = 47uF 25V
C2 = 2.2uF 25V
Q1-2 = BC550C
D1 = LED RED

We hope to form the reference materials in the manufacture of circuit pernagkat Audio Peak Indicators in the audio readers.

Monday, October 20, 2014

Simple 8 Watt Audio Power Amplifier Schematic

Here is the schematic for an 8 watt audio power amplifier. This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp. It is very small and portable unit and can be powered through 12V battery. I built the circuit on a Vero Board and had to add extra inductors, capacitors and resistors to prevent oscillation.

Circuit diagram:

8 Watt Audio Power Amplifier Schematic Circuit Diagram

8 Watt Audio Power Amplifier Circuit Diagram

Parts:

R1 = 47K
R2 = 2.2R/1W
R3 = 220R/1W
R4 = 2.2R/1W
C1 = 100nF-63V
C2 = 10uF-25V
C3 = 470uF-25V
C4 = 2000uF-25V
C5 = 100nF-63V
IC1 = LM383
SPKR = 4ohm/8W

Notes:

IC1 must be installed on a heat sink.
C1 is for filtering and to prevent oscillation and should not be omitted.
The circuit can be built on a Vero Board, universal solder board or PC board, the PC board is preferred.
The circuit draws about 880Ma at 12 V.
By swapping the values of R2 and R3; you can turn this amplifier into a guitar amp with no preamp required.
If you cant find 2000uF, then replace C4 with a 2200uF unit.
If you add a 0.2uF capacitor in series with a 1 ohm resistor to the output you can prevent oscillation of the circuit under certain conditions.

Audio Lm 3909 IC conduction tester

This tiny conductivity tester works with LM 3909. The tester makes a beeping sound if the resistance between the test probes between 0 and 100 O lies. Due to the volume of the beep, the resistance between the test probes can be determined.

Parts List

     R1 = 1 k
     C1 = 10 uF
     C2 = 100 nF
     LS = Loudspeaker 12 to 16 Ω
     IC1 = LM 3909

Friday, October 17, 2014

Using IC LA 4440 Laptop Audio Amplifier Circuit Diagram

This is the best IC LA 4440 Laptop Audio Amplifier circuit diagram, the audio output from the laptop’s built-in loudspeakers is low. A energy amplifier is needed to obtain a high volume. This is a simple circuit to amplify the laptop’s audio output. The circuit is made around energy amplifier IC LA 4440 (IC1) along with a couple of other components. LA4440 is really a dual funnel audio energy amplifier.

Using IC LA 4440- Laptop Audio Amplifier Circuit Diagram

Laptop-Audio-Amplifier-IC-LA-4440

Laptop Audio Amplifier Circuit Diagram

It’s low distortion over an array of low to high wavelengths with good funnel separation. Built-in dual channels enable it for stereo system and bridge amplifier programs. In dual mode LA4440 gives 6 w per funnel as well as in bridge mode 19- watt output. It’s ripple rejection of 46 dB. The audio result can be recognized by utilizing two 6-watt loudspeakers.

Connect hooks 2, 6 and ground of IC1 towards the stereo system jack which is combined with laptops. Assemble the circuit on the general-purpose PCB and enclose inside a appropriate cabinet. The circuit works off controlled 12V power supply. It’s suggested to make use of audio input socket within the circuit board. Make use of a proper warmth-sink for LA4440.

Wednesday, October 15, 2014

Audio Power Amplifier for AM Radio Circuit Diagram

This is an AM radio power amplifier circuit. What is different with other general amplifier is that this circuit has a low-pass filter (passive type), built using R1C1 to limit the input-output frequency response. Additionally, a ferroxcube K5-001-001/3B with 3 turns of wire is used as ferrite bead at output filter. All components should be spaced very close to the IC.

The ground and speaker lead must be twisted tightly. The supply lead and supply ground also must be twisted very tightly. Here is the schematic diagram of the circuit.

Audio Power Amplifier for AM Radio Circuit Diagram

Audio

Sunday, September 21, 2014

Audio Amplifier 1000W

Amplifier description:

I think youve seen or even have an active speaker and there is written 1500 watts PMPO (Peak Music Power Output), make no mistake this is different from Power Amplifier Active Speaker, I often dismantle such Active Speaker in it only a power with power no more than 150 watts by using the transformer 2-3 Ampere. PMPO is not a real power which is issued by the Power Amplifier, but counting all the speakers that there is, for example: if there are 5 pieces of speakers on each channel and each speaker has a power of 10 W then it is 100 W PMPO.

Amplifier circuit diagram:

While this 1000 Watt Power Amplifier minimal use transformer 20 Ampere. And the output of Power AmplifierDC voltage contains approximately 63 volts, with currents and voltages of this magnitude, this 1000 Watt Power Amplifier will not hesitate hesitate to destroy your woofer speakers to connect. To overcome that then before the speaker on connects to 1000 Watt Power Amplifier must be in pairs Speaker Protector.

Actually if you want to create a Power Amplifier with great power does not have to make a Power Amplifier with great power. Example: you want to create a Power Amplifier with 10 000 Watt power. You do not have to assemble a Power Amplifier with power of 10,000 watts, but you assemble the power Power Amplifier Small but many, such as you assemble the Power Amplifier with 1000 Watts of power for as many as 10 pieces, it will produce 10 000 Watt Power Amplifier helpless.

Amplifier circuit diagram:

Circuit uses power transistors pair of 5 x 5 x 2SA1216 and 2SC2922 and 2SC1583 use a differential amplifier that actually contains 2 pieces of transistors that are in containers together. Why use such built-in amplifier differental its for so identical / similar, could have uses 2 separate transistors but can result in amplifier so it is not symmetrical.

Saturday, September 20, 2014

5 Watt Class A Audio Amplifier Circuit diagram

This solid-state push-pull single-ended Class A schema is capable of providing a sound comparable to those valve amplifiers, delivering more output power (6.9W measured across a 8 Ohm loudspeaker cabinet load), less THD, higher input sensitivity and better linearity. Voltage and current required for this schema are 24V and 700mA respectively, compared to 250V HT rail and 1A @ 6.3V filament heating for valve-operated amplifiers. The only penalty for the transistor operated schema is the necessity of using a rather large Heatsink for Q2 and Q3 (compared to the maximum power delivered).In any case, the amount of heat generated by this schema can be comparable to that of a one-valve amplifier. An optional bass-boost facility can be added, by means of R5 and C5.

5 Watt Class-A Audio Amplifier Circuit diagram

Parts:

P1 = 47K
R1 = 100K
R2 = 12K
R3 = 47K
R4 = 8.2K
R5 = 1.5K
R6 = 2.7K
R7 = 100R
R8 = 100R
R9 = 560R-1/2W
R10 = 1R-1/2W
Q1 = BC560
Q2 = BD439
Q3 = BD439
C1 = 10uF-63V
C2 = 10uF-63V
C3 = 47uF-25V
C4 = 100uF-35V
C5 = 150nF-63V
C6 = 220uF-25V
C7 = 220uF-25V
C8 = 1000uF-25V
SPKR = 5W-8R Speaker

Notes:

If necessary, R2 can be adjusted to obtain 13V across C8 positive lead and negative ground.
Total current drawing of the schema, best measured by inserting the probes of an Avo-meter across the positive output of the power supply and the positive rail input of the amplifier, must be 700mA. Adjust R8 to obtain this value if necessary.
Q2 and Q3 must be mounted on a finned Heatsink of 120x50x25mm. Minimum dimensions.
Add R5 and C5 if the bass-boost facility is required.

Audio Amplifier 10W TDA1042

Features:

VCC MIN. V - 9
VCC NOM. V - 9
VCC MAX. V - 18
P. OUT W - 10
RL OHM - 2

Circuit Diagram:

Audio Amplifier 10W TDA1042

Thursday, September 18, 2014

Touch Select Audio Source

Often you need to connect output from more than one source (preamplifier) such as tape recorder/player and CD (compact disc) player to audio power amplifier. This needs disconnecting/connecting wires when you want to change the source, which is quite cumbersome and irritating. Here is a circuit that helps you choose between two stereo sources by simple touch of your hand. This circuit is so compact that it can be fixed within the audio power amplifier cabinet and can use the same power supply source. The circuit uses just two CMOS ICs and a few other componenets. The ICs used are MC14551/CD4551 (quad 2-channel analogue multiplexer) and CD4011 (quad 2-input NAND gate).

Touch-Select

Touch-Select

When touch-plate S1 is touched (its two plates are to be bridged using a fingertip), gate N1 output (IC1, pin 3) goes high while the output of gate N2 at pin 4 goes low. This causes selection of CD outputs being connected to the power amplifier input, which is indicated by lighting of LED1. When touch-plate S2 is touched, the outputs of gates N1 and N2 toggle. That is, IC2 pin 3 is pulled ‘low’ while its pin 4 goes ‘high’. This results in selection of tape recorder outputs being connected to the input of power amplifier. This is indicated by lighting of LED2. Pin 9 is the control pin of IC2.

In the circuit, the state of multiplexer switches is shown with pin 9 ‘high’ (CD source selected). When pin 9 is pulled ‘low’, all the switches within the multiplexer change over to the alternate position to select tape player as source. Note. Although one can connect pin 7 (VEE) of IC2 to ground, but for operation with preamplifier signals going above and below ground level, one must connect it to a negative voltage (say, –1V to –1.5V) to avoid distortion.

Sunday, September 14, 2014

Simple Audio Clipper Wiring diagram Schematic

Simple Audio Clipper Circuit Diagram for use with headphones, this schema sets the audio clipping level via a 5-KOhmhm pot. This type of noise clipper works best for pulse-type noise of low duty cycle, such as ignition noise. Rl sets the bias on the diodes for the desired limiting level.

Simple Audio Clipper Circuit Diagram

Simple

Saturday, September 13, 2014

140W audio amplifier with IC STK070

By using the above amplifier circuit you can hear the sound quality is quite good by a high output power. Maximum voltage circuit pa approximately 55Volt DC. 70-140W output power with impedance 8Ohm.

power

Part List
R1 = 10K
R2 = 1K
R3 = 0.4R
R4 = 0.4R
R5 = 4.7R
C1 = 0.015
C2 = 10uF
C3 = 220uF
C4 = 0.15uF
C5 = 220uF
C6 = 47uF
C7 = 0.047uF
U1 = STK050 , STK070

Friday, September 12, 2014

6 12 Volt audio amplifier circuits

The above is an amplifier circuit using supply voltages from 6 volts DC to 12 Volt DC. Power output of the amplifier is quite low with only 1 Watt 8 ohm impedance. You can apply this to the audio signal amplifiers that require strengthening are not so large as in the pocket radio.

Part List :
R1 = 100K
R2 = 39R
R3 = 100R
C1 = 100nF
C2 = 100uF
C3 = 100uF
C4 = 100uF
C5 = 470uF
C6 = 100nF
C7 = 68pF
C8 = 1nF
C9 = 47uF
IC = SFC2790C

Wednesday, September 10, 2014

LED Audio Level Meter Circuit

This circuit uses two quad op-amps to form an eight LED audio level meter. The op-amp used in this particular circuit is the LM324. It is a popular IC and should be available from many parts stores.

LED

LED audio level meter schematic

The 1K resistors in the circuit are essential so that the LEDs turn on at different audio levels. There is no reason why you cant change these resistors, although anything above 5K may cause some of the LEDs to never switch on. This circuit is easily expandable with more op-amps, and is not limited to use with the LM324. Pretty much any op-amp will work as long as you look up the pinouts and make sure everything is properly connected.

The 33K resistor on the schematic is to keep the signal input to the circuit at a low level. It is unlikely you will find a 33K resistor, so the closest you can get should do. The value of this resistor may need to be changed, so it is best you breadboard this circuit before actually constructing it on PCB. The circuit in its current form will accept line level inputs from sources such as the aux out on a Hi-Fi, all though could be easily modified to accept speaker inputs.

The audio + is connected to the main positive rail, while the audio - is used for signal input. The 50k pot can be used to vary the sensitivity of the circuit.

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