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 charged battery ) the maximum output power is at least 4.8W, and typically 5.2W into a 4Ω load.
The IC will, in fact, drive load impedance’s 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% ).
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- 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
Suggestion for PCB amplifier circuit TDA2002
List of components for the amplifier
|C1||10µF 25V Electrolytic Capacitor|
|C2||1000µF 25V Electrolytic Capacitor|
|C3||470µF 25V Electrolytic Capacitor|
|C1 , C3||100nF Polyester or ceramic capacitor – 100n, 0.1, .1, or 104|
|C2||39nF 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|
|R1||220 Ohms – Red, Red, Brown, Gold|
|R2||39 Ohms – Orange, White, Black, Gold|
|R3||1 Ohm / 1Watt – Brown, Black, Gold, Gold|
|R4||2.2 Ohms – Red, Red, Gold, Gold|
|P1||50k -Ohms Potentiometer to adjust the volume|
|Others||Heat-sink, power supply, wires, PCB, etc.|
For more information on the integrated circuit tda2002 see datasheet!
Download the PDF for the PCB for circuit power amplifier