The circuit diagram of Mini 2 W amplifier has been published here. The core part of this circuit is the IC TDA 7052 from Philips Semiconductors. The IC TDA7052 is a mono output amplifier. This IC has some features like 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. This amplifier IC has an internally fixed gain of 40 dB. Bridge-Tied-Load principle (BTL) is used by TDA7052 to compensate the reduction of output power due to low voltage supply.
The IC TDA7052 is an 8-lead DIP and is mainly designed for battery-operated portable audio circuits. Volume control in this circuit is done by potentiometer R1 (4.7 K). Capacitors C1 and C2 are used for supply voltage elimination when supply source is battery eliminator.
- Use a good quality PCB or common board to assemble this circuit
- For operations using a battery C1 and C2 are not necessary
- IC TDA 7052 can provide an output of around 1 to 2 W into an 8 Ohm load with a power supply of 6 V
- This amplifier can operate even from a 3V Mercury button cell and this makes it ideal for battery operated gadgets.