This is a class AB audio power amplifier circuit which built using a TDA2002 or TDA2003 power amplifier IC module. These are replacements for the original LM383 which is no longer available. It is easy to build and has a minimum of external components. The module has both short circuit protection and thermal protection. It can drive loads as low as 1.6 ohm and is capable of delivering over 10 watts from a 16 V supply.
The TDA2002 and TDA2002A are integrated circuit amplifiers specially designed for use in car radios, where the adverse electrical environment places great demands upon the reliability of circuits.
The supply voltage may be anywhere between +8 and +18V, and the IC will accept transient voltage peaks of up to 28V without damage. The IC can supply a short-circuit output current of 3.5 A and 15W of power at a case temperature of 90°C. At a supply voltage of 14.4V (fully-chargerd battery ) the maximum output power isat least 4.8W, and typically 5.2W into a 4Ω load.
The IC will, in fact, drive load impedances as low as 2Ω, in which case the maximum output power is at least 7W and typically 8W. The above power are all measured at 10% distortion, but obviously at lower output powers the distortion is much less (Typically 0.2% ).
- C. Input: 8 – 18V, 10 – 20 VA min.
- Power output:
- > 10 W RMS, 2 ohm load, 16V DC supply.
- > 6W RMS, 4 ohm load, 16V DC supply.
- > 4W RMS, 4 ohm load, 12V DC supply.
- THD: < 0.2% (1W, 4 ohm load) Gain: 40 dB maximum. S/N ratio : > 80 dBA. (G = 20 dB) > 60 dBA (G = 40 dB)
- Frequency response: < 20 Hz to > 40 kHz (-3dB, 4 ohm load)
- Input level:
- < 100 mV for full output (G = 40 dB)
- < 1V for full output(G = 20 dB)
Schematic diagram of the audio power amplifier tda2002
Layout component side
List of components for the amplifier
|C1||10 µF 25V Electrolytic Capacitor|
|C2||1000 µF 25V Electrolytic Capacitor|
|C3||470 µF 25V Electrolytic Capacitor|
|C1 , C3||100 nF Polyester or ceramic capacitor – 100n, 0.1, .1, or 104|
|C2||39 nF Polyester or ceramic capacitor – .039, 39n or 393|
|IC1||TDA2002 or TDA2003|
|IN||Two-terminal connector signal input|
|OUT||Two-terminal connector Audio Output|
|PWR||Two-terminal connector Power Supply|
|Resistors 1/4 watts 5 %|
|R1||220 Ohms – Red, Red, Brown, Gold|
|R2||39 Ohms – Orange, White, Black, Gold|
|R3||1 Ohm – Brown, Black, Gold, Gold|
|R4||2.2 Ohms – Red, Red, Gold, Gold|
|P1||100k -Ohms Potentiometer to adjust the volume|
|Others||Heat-sink, power supply, wires, pcb, etc.|
Circuit power supply for use with tda2002 – 15 volts / 1.2 amps
Layout component side
List of components for assembly of the power supply
|C1||100nF 100 nF Polyester Capacitor – 100n, 0.1, .1, or 104|
|C2||4700µF 35V Polyester Capacitor|
|C3 ,C4, C5, C6||10nF Polyester or ceramic capacitor – 10n, 0,01, or 103|
|D1, D2, D3, D4||1N4004|
|LED1||Led 5mm any color|
|Resistor 1/4 watt 5%|
|R1||10k Brown, Black, Orange, Gold|
|T1||Transformer – Primary according to the network and secondary 12-volt / 1.5 amps|
|AC||Connector for transformer|
|VCC||Output Connector VCC|
|Other||Wire, Plugs, box, pcb, etc.|
For more information on the integrated circuit tda 2002 datasheet see!
Download the PDF for the PCB for circuit and power amplifier
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