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My attempts at a design of a 3 stage amplifier
My attempts at a design of a 3 stage amplifier
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Old 16th January 2019, 07:33 PM   #321
edbarx is offline edbarx  Malta
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Default Negative voltages?

I am analysing the attached circuit to determine the sign of the voltage at the input, and at the large feedback capacitor terminal that is not connected to ground. LTSpice is telling me the small voltages are NEGATIVE with respect to ground. This means, the large capacitor should be soldered with its cathode to the resistor and the anode to ground. The input capacitor should be connected with its cathode to the base of the input transistor.

Am I right?
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Old 16th January 2019, 07:46 PM   #322
R Dijk is offline R Dijk  Norway
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c3 and c4 bipolar.
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Old 16th January 2019, 08:03 PM   #323
Mooly is offline Mooly  United Kingdom
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My attempts at a design of a 3 stage amplifier
That scenario is pretty normal. I would advise actually measuring the voltage across the real caps and rotate them accordingly to suit the actual polarity.
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