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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 25th December 2018, 01:55 PM   #951
Zoran is offline Zoran  Serbia
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Originally Posted by keantoken View Post
Try it with the AC187/188. The 2G339 is fast but the Vce limit is not quite where I would like it to be.
OK thanks.
But is there some resistor value to correct?
Should R1=R2 be lower values?
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Old 26th December 2018, 12:44 AM   #952
keantoken is offline keantoken  United States
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I think it will actually work fine with the circuit as it is. Try it and report the voltages at each transistor pin, then we can make some adjustments if necessary.
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Old 27th December 2018, 03:38 PM   #953
Zoran is offline Zoran  Serbia
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I think it will actually work fine with the circuit as it is. Try it and report the voltages at each transistor pin, then we can make some adjustments if necessary.
OK
I will do it this way
thanks
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Old 6th June 2019, 07:22 AM   #954
keantoken is offline keantoken  United States
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I am about to order a new batch of PCBs. The new PCBs will have curved traces but other than that will not be any different.
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Old 7th June 2019, 07:10 PM   #955
Bigun is offline Bigun  Canada
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The Kuartlotron - keantoken's simple error-correction superbuffer
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The new PCBs will have curved traces
I like that idea
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Old 17th June 2019, 06:57 PM   #956
keantoken is offline keantoken  United States
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The new PCBs are in.
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Old 23rd August 2019, 10:56 PM   #957
JasonB299 is offline JasonB299
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Default Push-Pull Kuartlotron

Hi Kean,

A young starting DIYer here. I am intrigued by your circuit. Have you ever tried a push-pull buffer like in the attachment? I guess referring to the enumeration from your site, the different Vce of Q1 and Q3 in this arrangement could be suboptimal for the error correction, because for transistors with limited VA the current through R1 and R2 and hence the Vbe of Q2 and Q4 would be different and signal dependant. But on the other hand the input capacitance of Q1 is now bootstrapped, which might help with high frequency linearity, when a high impedance source (read pot) is used. In any case, the buffer can now source and sink high currents by transitioning in class AB and - if I see it correctly - when Q2 and Q4 are thermally coupled as intentioned, the bias can be set by the current through the new input resistors and the ratio between input and output resistors plus, importantly, the bias is temperature stable. The only downside I can see in this regard, is that we will likely suffer from gm-doubling in the class A region due to the new output resistors, since the output impedance of each kuartlotron half is probably near zero from the error correction scheme.
What do you think about it?

Many greetings,
Jason
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