My new bench power supply

Circlotron · 27th April 2003, 02:52 PM

For years and years I have been doing all kinds of experiments without the luxury of having a proper bench power supply. I always got by with small lead acid batteries or a transformer with some diodes and caps hanging off it. You know the story...

Well the time had come to finally bite the bullet and build something useful. So here it is. First six pots (locking, 10 turn) are for 1.25 to 20v,1 amp all floating wrt to each other. Next one is 1.25 to 140v at 1 amp or less depending on output voltage. Last 2 pots are for + / - 1.25 to 40v 1 amp with a common earth. Also the full 40v at several amp unregulated is available. That sould be enough I think. The thing is mostly based on LM317 regs; the 140v output has a mosfet source follower that feeds the LM317 20 volts higher than whatever the output voltage is. Looks just like a cascode cct actually. As usual, made almost entirely of second hand junk. This is such a shock, me making somethng useful and almost tidy. Next thing you know I'll be digging the garden.

Circlotron · 27th April 2003, 03:10 PM

The guts. There are three 15 + 15 volt transformers hidden behind the aluminium heatsink bar.

Da5id4Vz · 27th April 2003, 04:02 PM

Digging in the garden!

SHHH!

Dont say that too loud, my wife might hear.

Its a great looking box. Will you add binding posts and metering in the future?

davesaudio · 27th April 2003, 06:07 PM

top pic:
what's on the left side middle (front to rear)?

JOE DIRT® · 27th April 2003, 07:36 PM

Circ you did a nice Job!!!!....the pots and knobs are worth a small fortune!!!....the p/s deserves some binding posts or a nice barrier strip

Circlotron · 28th April 2003, 12:32 PM

Quote:

Originally posted by davesaudio
top pic:
what's on the left side middle (front to rear)?

I will eventually

put some binding posts on the thing. It will probably go through a process of refinement. For example, I am already thinking of making the +/- 40v rails properly current limited and higher rating too.

davesaudio · 28th April 2003, 01:57 PM

must be some new kind of mapingo(sic?) disk....

Da5id4Vz · 28th April 2003, 04:29 PM

Where did you snag all those vernier pots? Did you salvage some old test gear or do you have a greatr surpluss store?

Speaking of spy sattelites, please stay out of site while in the garden. Wives have resources you know.

27th April 2003, 06:07 PM	#4
davesaudio diyAudio Member Join Date: Feb 2003 Location: GTA	top pic: what's on the left side middle (front to rear)? __________________ intentionally blank

28th April 2003, 01:57 PM	#7
davesaudio diyAudio Member Join Date: Feb 2003 Location: GTA	must be some new kind of mapingo(sic?) disk.... __________________ intentionally blank

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27th April 2003, 04:02 PM	#3
Da5id4Vz diyAudio Member Join Date: Feb 2003 Location: lost in america...	Digging in the garden! SHHH! Dont say that too loud, my wife might hear. Its a great looking box. Will you add binding posts and metering in the future?

27th April 2003, 07:36 PM	#5
JOE DIRT® diyAudio Member Join Date: Apr 2003 Location: Brantford, ON	Circ you did a nice Job!!!!....the pots and knobs are worth a small fortune!!!....the p/s deserves some binding posts or a nice barrier strip

28th April 2003, 04:29 PM	#8
Da5id4Vz diyAudio Member Join Date: Feb 2003 Location: lost in america...	Where did you snag all those vernier pots? Did you salvage some old test gear or do you have a greatr surpluss store? Speaking of spy sattelites, please stay out of site while in the garden. Wives have resources you know.

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