Wiring circuit

Showing posts with label 18w. Show all posts

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

Monday, October 20, 2014

18W TDA2003 bridge Circuit Diagrams

TDA2003 is a cheap amplifier that is designed to run on single rail power supplies (unipolar). It provides a high output current capability (up to 3.5A), very low harmonic and cross-over distortion.

18W TDA2003 bridge Circuit Diagram

TDA2003 bridge 18W amplifier
TDA2003 can be used as an BCL (bridge amplifier) and car deliver up to 18W.

Thursday, September 11, 2014

18W amplifier circuit based on IC HA13118

Here the 18W audio amplifier schema which powered by IC HA13118 as the main component.The type of this amplifier is bridge amplifier since the output line does not grounded.

18W

The supply voltage required for this schema is 8 – 18V DC, at least 1 to 2 Amps. Maximum output power will only be obtained with a power supply of 18V at greater than 2 A, using a 4 ohm speaker. The power supply should be well filtered to reduce mains hum, a regulated supply will reduce noise even further. Extra filtering is unnecessary if operating from a battery supply.

View more explanation about this 18W audio amplifier schema HERE.