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The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 22nd September 2018, 08:47 PM   #941
silasmellor is offline silasmellor  Denmark
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Join Date: Nov 2016
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The Kuartlotron - keantoken's simple error-correction superbuffer
Yeah I think it’s at min value, so essentially r9 is jumpered. Not sure what to make of it. On start up, tp slowly goes to 5v and offset to1-2mV.
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Old 22nd September 2018, 08:48 PM   #942
silasmellor is offline silasmellor  Denmark
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The Kuartlotron - keantoken's simple error-correction superbuffer
Quote:
Originally Posted by silasmellor View Post
Ok, using the 1M trimmer without the series 1.8M also works, so I suspect I’m just at the end of the travel for the pot, probably at low R. Would it make sense to try something even higher, like 2.2M for the Series resistor to R9? Is Avery low resistance for R9 a problem?
Sorry, that post should have said “without the 1.8M series resistor...”
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Old 22nd September 2018, 10:22 PM   #943
silasmellor is offline silasmellor  Denmark
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The Kuartlotron - keantoken's simple error-correction superbuffer
Ok I think my benchtop psu might have been the issue. I switched over to the intended psu, 10v bipolar using Nisbeths standalone whammy psu boards. Added another 500k in series with the 1.8M one and offset is only a few mV without any trimming. I can play music through it so I guess it works, but I will try the fft to check distortion (though I doubt I can trim much as my interface won’t go below 0.006%.

Sorry for the confusion, not sure why the benchtop psu was giving odd results, it has +/- and gnd taps, but measuring gnd to either + or - showed 0V so something must have been off there...
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Old 12th November 2018, 09:59 PM   #944
Zoran is offline Zoran  Serbia
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Join Date: Jan 2004
Location: Belgrade
Hi Ken. Could You transcribe superbuffer to Germanium transistor version?
(I have one full Ge amp and it need buffer to drive input transformer...)
I know that old Ge-s are maybe inferior against contemporary Si BJTs but I just dont like idea to mix...
thanks
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