Gain Stage Amplifier Circuit Diagram. With no emitter to ground resistor used and if the amplifier s service is for ac signals the inter stage coupling is often capacitive with voltage divider networks connected to each transistor base for proper biasing of. Because the loading r 3 r 4 output divider was accounted for in the first stage gain.

If you need exactly 6 you can play a round with the resistance on the input. Small signal transistor q1 and its associated components form the voltage amplification stage. I figured i would do a circuit that would be useful to crystal radio enthusiasts to play with.

Then we including the first stage of the preamplifier board to gain more signals from the audio source.

This issue is mainly happening min mic amplifier. This amplifier circuit is a bit simplified from what you will normally encounter in practical multi stage circuits. Connect the circuit diagram as in the one marked with amplifier with gain 20 and you get 20 fold the signal. Rarely is a pure common emitter configuration i e.