Circuit power amplifier stereo audio chip lm1875 – 2 x 20 watt and power supply circuit

This is an audio amplifier circuit using integrated LM1875 stereo to 2 x 20 Watts. With power supply for ease of assembly for any hobbyist. With a power of up to 20 Watts stereo amplifier that is suitable for use as power audio amplifier in various applications such as power amplifier for PC audio, FM radio, MP3 speaker, finally you’re sure to find great uses for this amplifier with LM1875 easy to assemble.

 

Diagram of stereo power amplifier lm1875 – click to enlarge

Suggested printed circuit board for mounting the amplifier chip LM 1875

Part List for assembly of a stereo amplifier with LM1875

Parts	Value
Capacitors
C1	100nF/63 V Polyester film or ceramic capacitor
C2, C3	3300µF/35V Polarized electrolytic capacitor
C4, C5, C12, C13	2.2µF/25V Polarized electrolytic capacitor
C6, C9	220nF/63V Polarized electrolytic capacitor
C7, C14	10µF/25V Polarized electrolytic capacitor
C8, C11	2200µF/35V Polarized electrolytic capacitor
Semiconductors
D1, D2, D3, D4	1N4004
B1	KBL406 4A Bridge Rectifier or equivalent
LED	Red LED for mounting on the front panel
IC1, IC2	LM1875T
Connectors
IN-L	Connector Left channel audio input
IN-R	Connector Right channel audio input
OUT-L	Connector Left Channel Audio Output
AC	Connector to the transformer
OUT-R	Connector Right channel audio Output
Resistors 1/4 watt 5%
R1, R6, R12	10k Brown, Black, Orange, Gold
R2, R3, R4, R8, R9, R10	22k Red, Red, Orange, Gold
R5, R11	220K Red, Red, Yellow, Gold
R7, R13	1R Brown, Black, Gold, Gold
Several
J1 – Jumper – piece of wire
Heat sink for the IC, printed circuit board, solder, Box to the amplifier, speakers, 30 watts 4 ohms
Transformer – 12 to 18 VAC / 2A to 3A

Download PDF Files Mounting amp with LM1875

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