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Adjustable Pre-Amplifier
8 Watt Audio Amplifier

References


The audio pre-amplifier is patterned after the excellent web pages of N1HFX. N1HFX has excellent tutorials on audio amplifier design. His idea of not including an emitter bypass to stabilize an audio amplifier circuit and including it as a gain booster was incorporated into this circuit.

Audio Amplifier Modifications

Note: The following changes were suggested by Dan McCabe, WA8YYE, who has worked with audio circuits for many years.

Note the audio gain adjust connections. The output of the pre-amp must be tied to the top of the potentiometer or the impedance of the output of the pre-amp will vary with the result that the volume of the audio will stop increasing at a halfway turn of the pot. This way the audio smoothly increases from minimum to maximum with turning of the audio pot.

If you have a Board 2 built before 7/11/2020, you will need to change the connections from the pot to the Audio Control square as shown below. (1 -> 2, 2 -> 1)

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