The Kuartlotron - keantoken's simple error-correction superbuffer - Page 20

keantoken · 19th March 2015, 09:34 AM

I would not increase the voltage, because self-heating effects are proportional to Vce. All the resistor values would also need changed. The transistors here have exceptional low-Vce behavior, so the input voltage should not be more than necessary.

A resistor and TL431 shunt regulator would be the simplest way to reduce the rails and fully meet the Kuartlotron's needs.

derekr · 19th March 2015, 01:30 PM

Quote:

Originally Posted by keantoken

I would not increase the voltage, because self-heating effects are proportional to Vce. All the resistor values would also need changed. The transistors here have exceptional low-Vce behavior, so the input voltage should not be more than necessary.

A resistor and TL431 shunt regulator would be the simplest way to reduce the rails and fully meet the Kuartlotron's needs.

Okay, shall look at doing it that way - thanks all.

formantjim · 24th March 2015, 01:51 AM

Followed the thread and your website fascinating circuit so simple and low component count great stuff!.
You make mention the max output current is -10mA but the "positive has no definite maximum" not sure what you mean by this.
Another point in the thread you mention this circuit is fast and suitable possibly for oscilloscope inputs any idea of the slew rate?
Going to be building this next!

keantoken · 24th March 2015, 02:01 AM

The slew rate is naturally extreme if unloaded but in practice it's limited by the load capacitance for negative pulses, so putting it in the specifications isn't much use.

sikahr · 31st March 2015, 04:35 PM

Hi,

Kean or somebody else,

can You please confirm this is correct schematics for Kuartlotron.

Ignore values at the moment, check connections and polarities.

Thanks

keantoken · 31st March 2015, 05:07 PM

The polarity is correct, although R10 is the wrong value.

sikahr · 31st March 2015, 05:21 PM

Work in progress, more or less finished...

Kean, please take a look & comment

I'll continue tomorrow, must to go...

MisterRogers · 31st March 2015, 05:27 PM

Nice work Sikahr Layout is rational.

keantoken · 31st March 2015, 05:31 PM

I think this will be okay.

sikahr · 1st April 2015, 10:22 AM

Only cosmetic changes, if there are no compalints I'll post this to dirty tommorow...

19th March 2015, 09:34 AM	#191
keantoken diyAudio Member Join Date: Aug 2006 Location: Texas	I would not increase the voltage, because self-heating effects are proportional to Vce. All the resistor values would also need changed. The transistors here have exceptional low-Vce behavior, so the input voltage should not be more than necessary. A resistor and TL431 shunt regulator would be the simplest way to reduce the rails and fully meet the Kuartlotron's needs. __________________ The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do!

24th March 2015, 02:01 AM	#194
keantoken diyAudio Member Join Date: Aug 2006 Location: Texas	The slew rate is naturally extreme if unloaded but in practice it's limited by the load capacitance for negative pulses, so putting it in the specifications isn't much use. __________________ The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do!

31st March 2015, 05:07 PM	#196
keantoken diyAudio Member Join Date: Aug 2006 Location: Texas	The polarity is correct, although R10 is the wrong value. __________________ The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do!

31st March 2015, 05:31 PM	#199
keantoken diyAudio Member Join Date: Aug 2006 Location: Texas	I think this will be okay. __________________ The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do!

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24th March 2015, 01:51 AM	#193
formantjim diyAudio Member Join Date: Oct 2013	Followed the thread and your website fascinating circuit so simple and low component count great stuff!. You make mention the max output current is -10mA but the "positive has no definite maximum" not sure what you mean by this. Another point in the thread you mention this circuit is fast and suitable possibly for oscilloscope inputs any idea of the slew rate? Going to be building this next!

31st March 2015, 05:27 PM	#198
MisterRogers diyAudio Member Join Date: Aug 2011 Location: Aurora, Colorado	Nice work Sikahr Layout is rational.

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