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-   -   The Kuartlotron - keantoken's simple error-correction superbuffer (https://www.diyaudio.com/forums/analog-line-level/251413-kuartlotron-keantokens-simple-error-correction-superbuffer.html)

keantoken 21st April 2017 02:25 AM

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.

RCruz 21st April 2017 06:41 AM

Ok, perfect.

What about the 1k resistor at the input of the kuartlotron, is it beneficial ?

keantoken 21st April 2017 07:17 AM

It may help with ESD, but in general it will just increase noise (although noise is probably not a problem here).

RCruz 21st April 2017 08:26 AM

Thank you again :)

Richidoo 5th June 2017 05:38 AM

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!


keantoken 5th June 2017 06:55 AM

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.

Richidoo 5th June 2017 07:21 PM

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?

keantoken 5th June 2017 10:27 PM

They will work, but I designed my own boards which I sell with a better layout.

BRN 9th June 2017 06:32 PM

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

keantoken 9th June 2017 11:01 PM

That is correct, there should be text on the board.


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