Schematic Power Amplifier and Layout

This is a simple circuit which I built to one of my audio amplifier projects to control the speaker output relay. The purpose of this circuit is to control the relay which turns on the speaker output relay in the audio amplifier. The idea of the circuit is wait around 5 seconds ofter the power […]

Amplifier Auto Power ON Signal detecting auto power-on unit, audio signal controlled relay switch module, amplifier auto power on, audio sensing power switch, audio detector switch, audio signal detector circuit, line level audio detection circuit, audio triggered power switch part : BC547 , BC557, LM358, Relay

PCB Solder Mask

Amplifier 30W circuit diagram with STK465 parts R1 = 1K C1 = 1uF/35V R2 = 3,3K C2 = 470pF R3 = 100 C3 = 100uF/60V R4 = 330 C4 = 100uF/60V R5 = 3,3K C5 = 10uF/60V R6 = 1K C6 = 47uF/60V R7 = 0,33 C7 = 8,2pF R8 = 33k C8 = 0,1uF […]

Audio Amplifier Circuit Using STK439

Best portable headphone amp circuit using LM833 or NE5532 High impedance headphones using : P1          22K R1         560R R2,R3 10K R4        12K R5,R6 2R2 R7        22R C1                   1µF 63V C2,C3,C4     100µF 25V C5                  22pF 63V C6                  22µF 25V IC1                LM833 or NE5532 Q1,Q3           BC337 Q2,Q4           BC327 Power supply parts: R8                                  2K2 C7,C8                            2200µF 25V D1                                   […]