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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 19th March 2015, 09:34 AM   #191
keantoken is offline keantoken  United States
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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.
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Old 19th March 2015, 01:30 PM   #192
derekr is offline derekr  Barbados
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Quote:
Originally Posted by keantoken View Post
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.
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Old 24th March 2015, 01:51 AM   #193
formantjim is offline formantjim  Canada
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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!
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Old 24th March 2015, 02:01 AM   #194
keantoken is offline keantoken  United States
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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.
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Old 31st March 2015, 04:35 PM   #195
sikahr is offline sikahr  Croatia
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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
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Old 31st March 2015, 05:07 PM   #196
keantoken is offline keantoken  United States
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The polarity is correct, although R10 is the wrong value.
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Old 31st March 2015, 05:21 PM   #197
sikahr is offline sikahr  Croatia
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Work in progress, more or less finished...

Kean, please take a look & comment

I'll continue tomorrow, must to go...
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Old 31st March 2015, 05:27 PM   #198
MisterRogers is offline MisterRogers  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
Nice work Sikahr Layout is rational.
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Old 31st March 2015, 05:31 PM   #199
keantoken is offline keantoken  United States
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I think this will be okay.
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Old 1st April 2015, 10:22 AM   #200
sikahr is offline sikahr  Croatia
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Only cosmetic changes, if there are no compalints I'll post this to dirty tommorow...
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