How do you go about calculating Zout for a phono stage? - diyAudio
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Old 28th September 2012, 12:32 AM   #1
andyr is offline andyr  Australia
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Default How do you go about calculating Zout for a phono stage?

EDIT: actually, I should have said "calculating or measuring the Zout".

Can anybody tell me how I go about finding out what the output impedance of my JFET-based phono stage is? It has a BC547 as the output buffer, if that is relevant.

Thanks,

Andy

Last edited by andyr; 28th September 2012 at 04:29 AM.
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Old 28th September 2012, 04:46 AM   #2
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Measuring is easy: put a largish known resistor in series between the output of the stage and the output of a signal generator. Short the input of the stage, turn the signal generator up enough to get say 1 mA across your known resistor and measure the voltage to ground at the output (of the stage, not the generator). The output Z is the residual voltage at the stage output divided by the resistor current.

Calculating is easy if you post the schematic.
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Old 28th September 2012, 04:54 AM   #3
andyr is offline andyr  Australia
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Thanks, Mark, I'll email you the schematic this evening.

Regards,

Andy
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