This is the mini audio amplifier circuit which built using power IC AN7115 as the main part. Tipically, with 9VDC supply and 4Ω loudspeaker, this amplifier will deliver about 2.1W. When the supply voltage (Vcc) is 9.0VDC , THD = 10% , RL = 8Ω, the output power of AN7114 can be up to 1.4W, the noise output is 3mV.

Limiting parameters: Vcc = 13V, power dissipation (without heat sink ) is 1.2W and 2.25W with radiator. Operating temperature: -20 to 70 ℃. It is suitable for small audio video application such mp3 player, mp4 player, ipods, smart phone, tablets, etc.

The following image is the PCB design layout for above circuit:

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Here are the parameters of the device:
6 – 12 VDC
Output power 1 W, 8 Ohm
Indicator of the circuit – LED
Small size – only 44 mm x 44 mm

Parts list :
R1:2k2
R2 : 1K
R3 : 22
C1 : 10uF/50V
C2 : 2.2uF/50V
C3 : 470uF/25V
C4 : 220uF/25V
C5, C6 : 0.1uF
C7 : 0.22uF
D1 : Red LED
PR1 : 10K preset
U1 : LM358
SW1 : Slide switch

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