Voltage reg for front end.

CBS240 · 31st December 2005, 12:39 AM

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....

CBS240 · 31st December 2005, 01:32 AM

This is the Ch1 input sw set to gnd, 0.5mV/div.

CBS240 · 31st December 2005, 01:38 AM

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!!

lineup · 31st December 2005, 02:39 AM

It is a nice circuit.

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

poobah · 31st December 2005, 02:46 AM

CBS240,

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

CBS240 · 31st December 2005, 03:01 AM

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...

lineup · 31st December 2005, 03:22 AM

Quote:

Originally posted by CBS240
This one?

Yes, of course.
I built same circuit and my results are exactly the same.

Very Good!

peranders · 31st December 2005, 08:04 AM

Have you considered a LM317, a very easy way to get a high voltage regulator.

31st December 2005, 02:39 AM	#4
lineup diyAudio Member Join Date: Dec 2005 Location: the north	It is a nice circuit. I built it, too. I get same results as you. Very good! __________________ lineup

31st December 2005, 08:04 AM	#8
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Have you considered a LM317, a very easy way to get a high voltage regulator. __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

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31st December 2005, 02:46 AM	#5
poobah diyAudio Member Join Date: Nov 2005	CBS240, I have a small concern... have you broken-in your scope probes... it looks like you might have some grainy-ness.