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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 21st April 2017, 01:25 AM   #851
keantoken is offline keantoken  United States
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As long as the Kuartlotron input has a DC path through the 50k pot to ground which doesn't get disconnected, you will be fine. 500k alone could cause a lot of offset. But with the 50k pot there, you don't really need the 500k unless you plan to disconnect the two circuits.
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Old 21st April 2017, 05:41 AM   #852
RCruz is offline RCruz  Switzerland
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The Kuartlotron - keantoken's simple error-correction superbuffer
Ok, perfect.

What about the 1k resistor at the input of the kuartlotron, is it beneficial ?
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Old 21st April 2017, 06:17 AM   #853
keantoken is offline keantoken  United States
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It may help with ESD, but in general it will just increase noise (although noise is probably not a problem here).
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Old 21st April 2017, 07:26 AM   #854
RCruz is offline RCruz  Switzerland
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The Kuartlotron - keantoken's simple error-correction superbuffer
Thank you again
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Old 5th June 2017, 04:38 AM   #855
Richidoo is offline Richidoo  United States
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Can kuartlotron be used in Sallen-Key type crossover filters which have a feedback loop around the buffer? I mean C1 and R1 - not the opamp FB loop, which I know is unnecessary.
Thanks!

The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 5th June 2017, 05:55 AM   #856
keantoken is offline keantoken  United States
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It may have too high output resistance for this application. It should be tested in simulation. I tried it with a notch filter topology which is similar.

EDIT: Nevermind, it seems to work fine.
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Old 5th June 2017, 06:21 PM   #857
Richidoo is offline Richidoo  United States
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Thank you so much for simulating it! There are many line level filters like this that your buffer could drive. Active Filters

Are those Kuartlotron boards from dirtyPCBs licensed/legit?
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Old 5th June 2017, 09:27 PM   #858
keantoken is offline keantoken  United States
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They will work, but I designed my own boards which I sell with a better layout.
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Old 9th June 2017, 05:32 PM   #859
BRN is offline BRN  United States
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I have the new Kuartlotron Superbuffer boards and want to set the DC trim but it does not indicate the value. If I remember correctly the value was 2.7M ohms, but want to make sure.

Thanks,
Brad
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Old 9th June 2017, 10:01 PM   #860
keantoken is offline keantoken  United States
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That is correct, there should be text on the board.
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