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Old 31st December 2005, 01:39 AM   #1
CBS240 is offline CBS240  United States
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Default Voltage reg for front end.

I needed a circuit that takes in +/- 75V, HW rectified, and output a clean +/- 60V DC with good load rejection and PS rejection. I suppose this is the purpose of a regulator circuit.

Anyway, so I have come up with a circuit that seems to do just that. Another good thing is it has less like only 50uV noise. This circuit can be switched on and off with a logic +5V. +5V turns on +/- 60V, 0V turns both sides off. A darlington output stage cannot conduct if the front end and bias is cut from 60V to 0V in about 1.5uS. BTW, this is all for the new "Circuit" I'm making.


So here is +/- 60V (20V/div) Ch1 is +60V, Ch2(bottom) is -60V. The + side seems to be slightly slower to turn off, but is still small at about 2uS. This is the two outputs switch on and off with a timer at about 13Khz. Current out is about 8mA. The more current the faster Toff. This circuit will not be turned on or off like this, but I just wanted to show the slew rate of the logic operated +/- 60V regulated switch.

Now, to proceed with the amp circuit....
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Old 31st December 2005, 02:32 AM   #2
CBS240 is offline CBS240  United States
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This is the Ch1 input sw set to gnd, 0.5mV/div.
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Old 31st December 2005, 02:38 AM   #3
CBS240 is offline CBS240  United States
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And then CH1 excactly 60.5V, set to measure AC 0.5mV/div. It doesn't matter where I set the time sweep, same result...very, very almost Nothing!!
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Old 31st December 2005, 03:39 AM   #4
lineup is offline lineup  Sweden
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It is a nice circuit.

I built it, too.
I get same results as you.
Very good!
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Old 31st December 2005, 03:46 AM   #5
poobah is offline poobah  United States
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CBS240,

I have a small concern... have you broken-in your scope probes... it looks like you might have some grainy-ness.

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Old 31st December 2005, 04:01 AM   #6
CBS240 is offline CBS240  United States
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Quote:
Originally posted by lineup
It is a nice circuit.

I built it, too.
I get same results as you.
Very good!

This one?


work in progress...
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Old 31st December 2005, 04:22 AM   #7
lineup is offline lineup  Sweden
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Quote:
Originally posted by CBS240
This one?
Yes, of course.
I built same circuit and my results are exactly the same.

Very Good!
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Old 31st December 2005, 09:04 AM   #8
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Have you considered a LM317, a very easy way to get a high voltage regulator.
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