Here is the circuit diagram of super mini 3 watt audio power amplifier, That can be powered with 4.5 volt dc to 18 volts dc (maximum). This amplifier is based on TDA1015, Product of PHILIPS Semiconductors. The TDA1015 is a monolithic integrated audio amplifier circuit in a 9-lead single in-line (SIL) plastic package. The device is especially designed for portable radio and recorder applications and delivers up to 4 watt in a 4 ohm load impedance. The very low applicable supply voltage of 3,6 V permits 6 V applications.
Parts:
R1-330K
R2-5.6K
R3-4.7R
C1-1uF-25V
C2-1uF-25V
C3-100pF
C4-100nF-63V
C5-182pF
C6-224pF
C7-100uF-25V
C8-100nF-63V
C9-10uF-25V
C10-1KuF-25V
IC1-TDA1015
Applications
In-car use
Your own unique application
Power amplifier for audio projects
For use with portable audio equipment
Small but powerful multi-purpose amplifier
Special features:
Low current drain
High output power
Thermal protection
High input impedance
Separated preamplifier and power amplifier
Limited noise behaviour at radio frequencies
Single in-line (SIL) construction for easy mounting
Specification:
Quiescent current : 12mA
Thermal and short circuit protection
Frequency Response : 60Hz - 15Khz
Max. output power : 3W (4ohm/12V)
Input sensitivity : 20-15mV selectable
Power supply : 4.5 - 15V DC @ 400mA