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Old 16th April 2013, 04:08 AM   #1
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Default minimum inout circuit for testing

I am experimenting with IPS and VAS circuits, using a function generator and o-scope.

my question is, using a very simple LTP IPS feeding a single transistor VAS, with the feed back loop being the same as it would be in a full amp, except for takeoff point being at the VAS collector, what is the minimum circuitry I can get away with to feed the function generator signal to the IPS.

I was thinking a large coupling cap, followed by a 1 meg resistor to ground for reference purposes, and then straight into the IPS. Other than maybe some sort of RF shunting cap, would this be fine? I just want bare bones so I can concentrate on the VAS and IPS. Obviously a more developed input circuit would be used in a working amp.

Any problem here? I assume I can't get by with less than that.
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Old 16th April 2013, 04:36 AM   #2
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That sounds right. The collector of the single transistor VAS would be the correct polarity for giving negative feedback to inverting input of the LTP.
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