Any common cathode (grounded grid) schematics? - diyAudio
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Old 23rd February 2006, 10:14 PM   #1
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Default Any common cathode (grounded grid) schematics?

Before you say "use the Search button" or "try Google" let me explain. I am interested in designs of what Broskie calls "common cathode" as shown here
Click the image to open in full size.
not just a plain grounded cathode stage which many also refer to as common cathode. It's very similar to the Rosenblits grounded grid minus 1 triode I guess. I think the terminology is tripping up my attempts to research. Any help appreciated.
The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts. Bertrand Russell
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Old 24th February 2006, 06:49 AM   #2
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What you have there is a "long tail pair" with the output taken from only one anode (if you took the output from both anodes, it would be a phase splitter).

I have never tried the (non-splitter) version of this circuit that you show; however, from memory, it's highly regarded by those who would know, presumably for its power supply rejection ratio (PSRR - posh way of saying low hum), low distortion and stable gain. It also gives a non-inverted output, unlike the more conventional common cathode amplifier, if that's important to you.
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Old 24th February 2006, 07:29 AM   #3
hacknet is offline hacknet  Singapore
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but this one looks different huh.. the first triode's anode is bypassed to ground by a 100uf cap... and there seems to be a feed back network on the 2nd triode..!
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