Description
Here is a simple and humble 2 Watts mini audio amplifier circuit suitable for small pocket radios and
other portable audio gadgets.The circuit is based on Phillips
Semiconductors IC TDA 7052.The amplifier can be run even from a 3V
Mercury button cell.This makes it ideal for battery operated gadgets.
The IC TDA7052 is a mono output
amplifier coming in a 8-lead DI package (DIP). The device is mainly
designed for battery-operated portable audio circuits. The features of
TDA 7052 include ,no external components needed, no switch-on or
switch-off click sounds , great overall stability ,very low power
consumption(quiescent current 4mA) , low THD, no heat sinks required
and short-circuit proof.
The gain of TDA 7052 is fixed
internally at 40 dB. . To compensate the reduction of output power due
to low voltage supply the TDA7052 uses the Bridge-Tied-Load principle
(BTL) which can provide an output of around 1 to 2 W Rms(THD = 10%)
into an 8 Ohm load with a power supply of 6 V.
In the circuit the potentiometer
can be used to control the volume. Capacitor C1 and C2 are meant for
filtering the supply voltage if a battery eliminator is used as supply
source. For operations using a battery C1 and C2 are not necessary.
Mini Audio Amplifier Circuit Diagram with Parts List:
Notes.
- Assemble the circuit on a good quality PCB or common board .
- If you are a little expert, you can assemble the circuit in a match box including the speaker.
