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Old 27th April 2003, 02:52 PM   #1
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Default My new bench power supply

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.
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Old 27th April 2003, 03:10 PM   #2
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The guts. There are three 15 + 15 volt transformers hidden behind the aluminium heatsink bar.
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Old 27th April 2003, 04:02 PM   #3
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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?
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Old 27th April 2003, 06:07 PM   #4
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top pic:
what's on the left side middle (front to rear)?
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Old 27th April 2003, 07:36 PM   #5
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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
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Old 28th April 2003, 12:32 PM   #6
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Default Spy satellite photo.

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.
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Old 28th April 2003, 01:57 PM   #7
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must be some new kind of mapingo(sic?) disk....
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Old 28th April 2003, 04:29 PM   #8
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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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