![]() 10) a single-stage CE amplifier circuit has been illustrated, in which an NPN transistor has been applied. Hence, the output of the voltage divider circuit is used for proper biasing to turn ON the transistor. Two of them (Q7, and Q6) are working as pre-amplifier. The circuit schematic diagram shows the amplifier power supply layout But the idea behind his audio amplifier circuit diagram is stellar PIN 1 and 8: These are the gain control PINs, internally the gain is set to 20 but it can be increased up to 200 by using a capacitor between PIN 1 The 555 timer is a simple integrated circuit that can be used.
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