Showing posts with label stereo. Show all posts
Showing posts with label stereo. Show all posts
Tuesday, November 4, 2014
Stereo Power Amplifier Circuit based on BA5417
BA5417 is a stereo amplifier IC with a lot of good features like thermal shut down, standby function, soft clipping, wide operating voltage range etc. The IC can deliver 5W per channel into 4 ohm loud speakers at 12V DC supply voltage. The BA5417 has excellent sound quality and low THD (total harmonic distortion) around 0.1% at F=1kHz; Pout=0.5W.
Stereo Power Amplifier Circuit diagram :
Setup and working of this stereo power amplifier circuit is somewhat similar to the BA5406 based stereo amplifier circuit published previously. C10 and C11 are DC decoupling capacitors which block any DC level present in the input signals. C2 and C6 couples the amplifiers left and right power outputs to the corresponding loud speakers. C1 and C5 are bootstrap capacitors.
Bootstrapping is a method in which a portion of the amplifiers is taken and applied to the input. The prime objective of bootstrapping is to improve the input impedance. Networks R1,C3 and R2,C7 are meant for improving the high frequency stability of the circuit. C4 is the power supply filter capacitor. S1 is the standby switch. C8 is a filter capacitor. R3 and R4 sets the gain of the left and right channels of the amplifier in conjunction with the 39K internal feedback resistors.
Note :
- Supply voltage range of BA5417 is from 6 to 15V DC.
- The recommended supply voltage for this circuit is 12V DC.
- The power supply must be well regulated and filtered.
- BA5417 requires a heatsink.
- The circuit can be assembled on a perf board without much degradation in performance.
Monday, October 27, 2014
60W Dual Stereo Power Amplifier
A portion of electronic circuits into the domain of audio amplifiers are already been available at this juncture. This circuit is a hardly singular for the reason that it is a four channel amplifier. each one channel of this amplifier can furnish with an output of 15Watts into a 4 ohm amplifier. The amplifier can subsist operated from a single 12V DC supply and this makes it likely to spend this amplifier happening car audio applications too.
The circuit is based on the 15W BTL X 2 channel audio power amplifier IC TA8215 from Toshiba. Even though whittle is specifically designed designed for car audio applications it can stay and used for to your place audio applications. Two TA8215 ICs are used now in order to gain a 4 channel amplifier practice. The circuit is designed almost exactly in the role of for each the use diagram within the ICs datasheet. Pins 7 and 19 are the Vcc pins of the ICs inner integrated power amplifier stages and these pins are connected to the optimistic supply. Pin 9 is the Vcc pin in lieu of ICs interior preamplifier and it is additionally connected to the positive supply.
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| 60W Dual Stereo Power Amplifier |
Pins 13 and 14 are the domestic power amplifiers ground pins and they are fixed cool and connected to the ground. The in-house preamplifier’s ground pin (pin5) is connected to the regular ground through a 10 Ohm resistor which makes the input ground separated from the common ground by a resistance of 10 ohms and this improves the sound rejection. The 100uF capacitor workings in the function of a power supply de-coupler. The resistor networks connected to the output defenses of both amplifier improves the far above the ground frequency stability. The movable resistors (R3, R4, R12 and R13) facility as the volume controller intended for the corresponding channels.
Wednesday, October 15, 2014
Simple Stereo Indicator Detects L R Signal Difference
This true stereo indicator is different from what we usually find on FM radio receiver, which is usually a pilot tone detector. A stereo broadcast from FM radio station contain pilot tone, but a presence of pilot tone doesn’t necessarily a stereo broadcast signal since a mono FM transmitter ca broadcast pilot tone as well. Since this circuit detect the difference between left and right channel, this circuit can detect a real stereophonic programs.
When there is no difference between R and L input signals, the output A1 and output A2 is at the same potential. That will make a a virtual ground rail at half the supply voltage. Here is the schematic diagram of the circuit. The A1 will supply a negative or positive voltage when A1 detects a difference between R and L input signals with respect to the virtual ground rail.
The C4 will be charged via D2 an C3 via D1. The LED is turned on by the comparator A3/A4 via OR circuit D3/D4. The input signal level should be greater than 100mV to compensate for the drop across D2 or D1. P1 is used to adjust the sensitivity of stereo indicator.
Stereo Indicator Detects L-R Signal Difference Circuit Diagram
Friday, September 19, 2014
100W LM3886 Parallel Stereo Power Amplifier
This amplifier is based on the PA100 parallel amplifier detailed in National Semiconductors application note - AN1192. Since my DIY speaker is 4-ohm and somewhat difficult to drive, I want to have a more powerful amplifier to match with it. Therefore I designed this amplifier which uses two LM3886 per channel, in parallel circuit. This amp can deliver about 50W into a 8-ohm speaker and 100W into a 4-ohm speaker. This is a stereo amplifier and therefore 4 LM3886s are used.
The LM3886 circuit is in a non-inverted configuration, so the input impedance is determined by the input resistor R1, i.e. 47k. The 680 ohm and 470pF resistor capacitor filter network is used to filter out the high frequency noise at the RCA input. The 220pF C4 and C8 capacitors are used to shot out the high frequency noise at the LM3886 input pins. I used high quality audio grade capacitors at several locations: 1uF Auricap at the input for DC blocking, 100uF Blackgate for C2 and C6, and 1000uF Blackgate at the supply filter.
The LM3886 circuit is in a non-inverted configuration, so the input impedance is determined by the input resistor R1, i.e. 47k. The 680 ohm and 470pF resistor capacitor filter network is used to filter out the high frequency noise at the RCA input. The 220pF C4 and C8 capacitors are used to shot out the high frequency noise at the LM3886 input pins. I used high quality audio grade capacitors at several locations: 1uF Auricap at the input for DC blocking, 100uF Blackgate for C2 and C6, and 1000uF Blackgate at the supply filter.
The PCB is designed in a way that the power ground is separated from the signal ground, as you can see from the below layout. The signal ground is located in the middle and surrounded by the power ground. There is a thin trace near C5 connecting them. The PCB layout is done by using PADS PowerPCB 5.0. I think it is a powerful layout software. After finished the layout, I send it to a PCB manufacturer in HK to make the PCB. After the PCB is made, I found some of the drill holes are not large enough.... I have to make it bigger manually.
Finished PCB.
The 20k and 1k resistors are hand matched to 0.1%. For the output resistors, I used six 0.5W 1% 1ohm resistors in parallel per 3886 output instead of one 3W resistor because 3W 1% resistors are hard to find.
I used the insulated version - LM3886 TF, so that I can mount it directly to the case and heat sink with thermal compound.
Coupling capacitor is Auricap 1uF 450V. I used this high quality capacitor because it is in the main signal path.
The HF filter capacitors are Silver Mica 47pF and 220pF.
The power supply filter used is Blackgate 1000uF 50V.
C2 and C6 are Blackgate 100uF 50V. For better result, the bi-polar version should be used. However I am not using it because the bi-polar blackgate is too big to fit into my PCB.
The 680 ohm + 470pF filter network is installed at the RCA. This help filtering the high frequency noise before it gets onto the board.
The WIMA 0.1uF supply decoupling capacitors are soldered directly on the pins of LM3886 at the back of the PCB. This helped to remove some high frequency noise.
The 3886 are mounted on a 3/8 inch aluminum plate then to the case. Outside of the case I used 3 PC CPU heatsinks. I used Arctic Silver thermal compound between the aluminum layers to improve heat conductivity.
With all these big heatsinks, it only get slightly warm when listen at normal volume.
The power supply used is a regulated power supply. I used 10000uF per rail before the LT1083 regulator. After the regulator, I have 100uF on the regulator board. The advantage of using regulator is that the power supply ripple voltage is removed. If power regulation is not used, I can hear very little 50/100Hz hum from the speaker.
Power Supply Schematic :
The high current MUR860 diode is used to ensure high current flow.
The voltage regulator used is LT1083, it can provide about 8A of current.
Transformer used here is a 500VA 2x 25V. The power supply is then regulated by 2 LT1083, after the regulation, the voltage is 30V.
Will consider to use this supply circuit instead, the TIP2955 is capable of providing 15A of current:
I did some DC measurement and the result is quite good, I got 7 mV of DC offset at the speaker terminal. The voltage difference between the output of the 2 chips is less then 1 mV.
The sound of this amplifier is similar to my LM3875 amplifier, which is very clean and detail. It has no hum, no hiss and no noise. Compared to the LM3875 Gainclone, this amp can deliver twice the power to my 4-ohm speaker, and it improves the dynamics and bass punch a lot.
Finished PCB.
The 20k and 1k resistors are hand matched to 0.1%. For the output resistors, I used six 0.5W 1% 1ohm resistors in parallel per 3886 output instead of one 3W resistor because 3W 1% resistors are hard to find.
I used the insulated version - LM3886 TF, so that I can mount it directly to the case and heat sink with thermal compound.
Coupling capacitor is Auricap 1uF 450V. I used this high quality capacitor because it is in the main signal path.
The HF filter capacitors are Silver Mica 47pF and 220pF.
The power supply filter used is Blackgate 1000uF 50V.
C2 and C6 are Blackgate 100uF 50V. For better result, the bi-polar version should be used. However I am not using it because the bi-polar blackgate is too big to fit into my PCB.
The 680 ohm + 470pF filter network is installed at the RCA. This help filtering the high frequency noise before it gets onto the board.
The WIMA 0.1uF supply decoupling capacitors are soldered directly on the pins of LM3886 at the back of the PCB. This helped to remove some high frequency noise.
The 3886 are mounted on a 3/8 inch aluminum plate then to the case. Outside of the case I used 3 PC CPU heatsinks. I used Arctic Silver thermal compound between the aluminum layers to improve heat conductivity.
With all these big heatsinks, it only get slightly warm when listen at normal volume.
The power supply used is a regulated power supply. I used 10000uF per rail before the LT1083 regulator. After the regulator, I have 100uF on the regulator board. The advantage of using regulator is that the power supply ripple voltage is removed. If power regulation is not used, I can hear very little 50/100Hz hum from the speaker.
Power Supply Schematic :
The high current MUR860 diode is used to ensure high current flow.
The voltage regulator used is LT1083, it can provide about 8A of current.
Transformer used here is a 500VA 2x 25V. The power supply is then regulated by 2 LT1083, after the regulation, the voltage is 30V.
Will consider to use this supply circuit instead, the TIP2955 is capable of providing 15A of current:
I did some DC measurement and the result is quite good, I got 7 mV of DC offset at the speaker terminal. The voltage difference between the output of the 2 chips is less then 1 mV.
The sound of this amplifier is similar to my LM3875 amplifier, which is very clean and detail. It has no hum, no hiss and no noise. Compared to the LM3875 Gainclone, this amp can deliver twice the power to my 4-ohm speaker, and it improves the dynamics and bass punch a lot.
NJM2035 High Quality Stereo Encoder
High Quality Stereo Encoder with NJM2035
![NJM2035]()
![NJM2035]()
Technical Specifications:
Supply Voltage: 1.2V - 3.6V MAX
Current Draw:> 3mA
Channel Separation: <25 dB
Signal to Noise Ratio: 67 dB
Operation Temperature: -20 - 75 ° C
Frequency Range: 20Hz - 15KHz
Component List:
R 2x 47K
R 1x 10K
R 1x 82K
VR 1x 50K POT
C 1x 33uF
C 1x 10uF
C 3x 100nF (104)
C 1x 100pF (101)
C 1x 10pF (10)
1x IC IC NJM2035
1x XT 38 KHz Crystal
Read More..
This stereo encoder is the perfect solution for those looking for transmitting high quality stereo sound with low cost. This stereo encoder produces crystal clear stereo sound very good and very good channel separation that can match many more expensive stereo encoders that are available in the market.
Its all possible thanks to 38KHz quartz crystal that controls the 19kHz pilot tone, so youll never go back to calibrate or adjust sirkuit.NJM2035 offer superb quality and manufactured by NJR CORPORATION (JRC), a subsidiary of New Japan Radio, a company known as the worlds best manufacturers of high end professional audio semiconductors. This transmitter will work with mono FM transmitter including the TX300 and TX500 are available on our website. The entire series can easily fit on a small "x 1.5" printed circuit board that allows to adjust in a place where space is limited. While building your stereo encoder please take your time and always check with the scheme to ensure that all connections are done correctly.
Technical Specifications:
Supply Voltage: 1.2V - 3.6V MAX
Current Draw:> 3mA
Channel Separation: <25 dB
Signal to Noise Ratio: 67 dB
Operation Temperature: -20 - 75 ° C
Frequency Range: 20Hz - 15KHz
Component List:
R 2x 47K
R 1x 10K
R 1x 82K
VR 1x 50K POT
C 1x 33uF
C 1x 10uF
C 3x 100nF (104)
C 1x 100pF (101)
C 1x 10pF (10)
1x IC IC NJM2035
1x XT 38 KHz Crystal
How it Works
Stereo encoder consists of three main stages, pre-emphasis, digital encoder and mixer stages.
Pre-emphasis stage is achieved by using two 47K resistors and two capacitors 1NF. This helps to eliminate noise generated during the FM transmission of your audio signal.
The second stage is built around NJM2035 is a digital encoder. All internal blocks except for two audio amplifiers (pins 1 & 14) which acts as a separator made using digital circuits. The first digital circuit is a 38KHz oscillator generated by using external 38KHz crystal (pin 7), 10pF capacitor (pin 6) and 100pF bypass capacitor (pin 5). After 38KHz frequency generated is then buffered and divided into two 19KHz signals with a 180 degree phase difference. Once it is done two frequencies associated with two time division switching MPX digital alternating, one for each audio channel. Heres the audio channel is switched between each other with a total frequency of 38KHz. If you will be able to slow this frequency to 1Hz per second you will be able to hear that this trick is all but. During the first half of the two you will hear the left audio channel and in the second half the second you hear the right audio channel. Due to the fact that the channels are activated by a rapid frequency of 38KHz per second our brain can not recognize that this channel is really switched on and accept this as a continuous audio signal. At the same time another signal from the 38KHz oscillator is divided half to 19KHz. This signal is called a PILOT tone because it will help the stereo decoder in the receiver to slice MULTIPLEX signal (mixed L and R audio channels) and separate them back to the left and right channel audio.
The third stage is a mixer which consists of 33uF and 100nF capacitors and resistors are 82K and 10K. The role of this circuit is to mix the multiplex subcarrier and pilot signals together. The subcarrier multiplex signal coming out of Pin 9 of IC NJM2035 is the sum and difference of both left and right audio channels are activated at 38Khz. PILOT signal coming out of the pin 8 is the frequency of 19KHz that is used to distinguish what channel is currently switched on and without decoding stereo that will not be possible.
Sunday, September 7, 2014
Stereo 9 Volt power amplifier circuit
Here I will explain about the necessary voltage and power amplifier output. The voltage should have at least approximately 9Volt 30Volt voltage and maximum voltage on the DC current. For maximum output of 2 X 2Watt with impedance 8-16 ohm. Because this amplifier circuit using ic and ic is used have the equation, so that if used different ic, then the required output voltage and also differ depending ic respectively.
Part List :
Resistor
R1 = 1M
R2 = 1M
R3 = 1K
R4 = 1K
R5 = 100K
R6 = 100K
R7 = 1R
R8 = 1R
Capacitor
C1 = 1uF
C2 = 220uF
C3 = 1uF
C4 = 100uF
C5 = 5uF
C6 = 5uF
C7 = 0.1uF
C8 = 220uF
C9 = 220uF
C10 = 0.1uF
IC
U1 = ULN2274B , ULN2277 , ULN2278B
Friday, September 5, 2014
Power Amplifier Circuit 2 x 20 W stereo with IC AN7156N
This circuit operate with IC AN7156N . You just can use this IC , because havnt similarity it. In this Circuit have 2 input IN R and IN L and have Output R and L . Voltage supply require 15 V , minimum voltage 9 V and maximum voltage 24V . And the voltage must DC voltage , and better the DC voltage filtering .
Maximum Output for 1 speaker 25 W , so this circuit have maximum output 2 X 25 W with minimum impedance 4 ohm. See this circuit schematic below :
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| Click image to view enlarge |
Sunday, August 31, 2014
Find the best stereo for your car
You can find out how to choose the best stereo for your car by reading this informative article!
The first thing to do is to check with your family members and friends to see what kind of stereo equipment they have in their vehicles. Referrals are sometimes the best way to find a reliable brand. The next step is to start shopping around in electronic stores to see what brands there are, what kinds of stereos are available for purchase, and what options are available. Be sure to check on what kind of a warranty that each stereo carries. Decide at this point what you want in a stereo and what you do not want. Decide what you would like to have, but what you can live without. For example, do you really need twenty radio preset buttons or can you live with only six? Beware of the extras that you may not need. If you are not going to use them, then do not buy a system with them on it. The more the gadgets, the higher the cost of the stereo, of course. Decide on how much money you can possibly spend. Talk to sales clerks and ask their opinions about the different kinds of stereos. Ask what kind they have in their own vehicles. Ask at each store whether-or-not they are authorized dealers of the products that they recommend. If your stereo needs repaired, can you take it back there and have it fixed?
Ask each sales clerk if they can demonstrate each of the models they carry? Obviously you will want to hear the differences in the stereos before you finally choose one and buy it. Find out if they will install the stereo too. Ask them the exact steps that they would take in order to accomplish the task. Find out if they have any pictures of their work. This especially pertains to the installation of the stereos speakers ans subwoofers. If you purchase a stereo and speakers that are the same size as what you currently have, then the new equipment can simply be put into the same spaces that your current equipment is in. But, if you purchase bigger speakers that will need more space to accomodate them, then these units need to be enclosed first, and then covered with carpet to match your car, truck, or van.
Stereos for your vehicle usually start out with the basic AM/FM radio unit. That is the most basic stereo you can get. Then, there are models that also have cassette players and CD players, etc. Name brand stereos and speakers are probably the better route to take when choosing. You will undoubtedly get a better sound and performance from a name brand that you can trust. Stay away from cheap models that probably sound tinny, muffled, or otherwise unnatural. The cheaper brands tend not to hold up as well as the name brands too.
Finally, the sales people will probably try to talk to you about woofers and tweeters and frequencies, etc. To put it in plain English, the woofer handles the bass frequencies and the tweeter handles the treble frequencies. If you are really interested in this, that is fine. But, if you are not, then that is all you need to know. If you dont understand the lingo of the stereo world, dont let them baffle you with foreign sounding words, technical terms, and other information that you really dont need to know.
Read More..
The first thing to do is to check with your family members and friends to see what kind of stereo equipment they have in their vehicles. Referrals are sometimes the best way to find a reliable brand. The next step is to start shopping around in electronic stores to see what brands there are, what kinds of stereos are available for purchase, and what options are available. Be sure to check on what kind of a warranty that each stereo carries. Decide at this point what you want in a stereo and what you do not want. Decide what you would like to have, but what you can live without. For example, do you really need twenty radio preset buttons or can you live with only six? Beware of the extras that you may not need. If you are not going to use them, then do not buy a system with them on it. The more the gadgets, the higher the cost of the stereo, of course. Decide on how much money you can possibly spend. Talk to sales clerks and ask their opinions about the different kinds of stereos. Ask what kind they have in their own vehicles. Ask at each store whether-or-not they are authorized dealers of the products that they recommend. If your stereo needs repaired, can you take it back there and have it fixed?
Ask each sales clerk if they can demonstrate each of the models they carry? Obviously you will want to hear the differences in the stereos before you finally choose one and buy it. Find out if they will install the stereo too. Ask them the exact steps that they would take in order to accomplish the task. Find out if they have any pictures of their work. This especially pertains to the installation of the stereos speakers ans subwoofers. If you purchase a stereo and speakers that are the same size as what you currently have, then the new equipment can simply be put into the same spaces that your current equipment is in. But, if you purchase bigger speakers that will need more space to accomodate them, then these units need to be enclosed first, and then covered with carpet to match your car, truck, or van.
Stereos for your vehicle usually start out with the basic AM/FM radio unit. That is the most basic stereo you can get. Then, there are models that also have cassette players and CD players, etc. Name brand stereos and speakers are probably the better route to take when choosing. You will undoubtedly get a better sound and performance from a name brand that you can trust. Stay away from cheap models that probably sound tinny, muffled, or otherwise unnatural. The cheaper brands tend not to hold up as well as the name brands too.
Finally, the sales people will probably try to talk to you about woofers and tweeters and frequencies, etc. To put it in plain English, the woofer handles the bass frequencies and the tweeter handles the treble frequencies. If you are really interested in this, that is fine. But, if you are not, then that is all you need to know. If you dont understand the lingo of the stereo world, dont let them baffle you with foreign sounding words, technical terms, and other information that you really dont need to know.
Friday, August 29, 2014
Stereo tone control with loudness and filter
Tone control circuit is used to adjust the tones before entering the amplifier. Tone control over equipped with a loudness and filter directly without using the switch to disconnected or connected. Part of his filter that is C1 and R1 from ground to input , and for his loudness on the R4 and C3 are connected to the input and then go to VR1. C2 and R3 go from ground to the input . After the input is set by volume or VR1 then procesed again by treebel ie C8 , R13 , R14 , and VR2 . Bass on R10 , R11, R12 , C7 ,C8 , and VR3. For supply voltages has been given a stabilization in Q3. See schematic below :
| Click to view larger |
Part list :
R1 = 100K
R2 = 50K trim
R3 = 22K
R4 = 15K
R5 = 1K
R6 = 4K7
R7 = 330K
R8 = 330K
R9 = 3K3
R10= 5K6
R11= 8K2
R12= 5K6
R13= 1K
R14= 1K
R15= 50K TRIM
R16= 50K TRIM
R17= 330K
R18= 4K7
R19= 47K
R20= 1K
R21= 4K7
R22= 2K2
R23= 100R
R24= 22K
C1 = 15n
C2 = 15n
C3 = 560p
C4 = 4u7
C5 = 33u
C6 = 4n7
C7 = 39n
C8 = 39n
C9 = 4u7
C10=4u7
C11=470u
C12=100u
Q1 = C1815
Q2 = C828
D1 = Green Led
This tone control is suitable with 150W OCL power amplifier type 036.But the schematic is mono, if you need a stereo tone control you must duplicate the components and circuit.
| Installation the stereo tone control |
2 X 30 Watt stereo amplifier by TDA1510
This power amplifier can use IC TDA1510 or TDA1515, minimum voltage require 6 volt and maximum voltage require 18 Volt, Voltage with DC supply voltage.Power output 2x 30 Watt stereo amplifier , with 2 ohms impedance , its is low impedance . You can use the fullrange or woofer speakers. see schematic below :
Wednesday, August 27, 2014
20 20W STEREO AMPLIFIER WITH STAND BY
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| Circuit diagram TDA7262 20+20W STEREO AMPLIFIER WITH STAND-BY |
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