Thursday, October 24, 2019

DC receiver preamp

The antenna is 200 ohm so the common base is a good Z match.

I set the generator at 200 ohms with 1 mv out. The input is 500uv. The generator internal Z is dropping half the input.

The bias is eating up 2ma. With the collector current so low the bias circuit current could be lowered.

I increased the bias resistor X100.

The amp output is close to the same. 

The question is, "How much current should the bias network draw?".

Next post we can add the second stage.

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