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Sub-$50 bench power supply?


guzziguy

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I suppose tracking isn't 100% necessary, I was just hoping that it would allow for the supply to maintain a balanced + and - rail but if it's a stable supply that isn't really a concern. I did some more digging this morning and I think this is what I'm looking for, just a bit on the expensive side of what I'd want to spend.

MASTECH VARIABLE DC POWER SUPPLY (HY3003F-3) 0-30V/0-3A - eBay (item 380190160888 end time Dec-30-09 14:42:05 PST)

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I suppose tracking isn't 100% necessary, I was just hoping that it would allow for the supply to maintain a balanced + and - rail but if it's a stable supply that isn't really a concern. I did some more digging this morning and I think this is what I'm looking for, just a bit on the expensive side of what I'd want to spend.

MASTECH VARIABLE DC POWER SUPPLY (HY3003F-3) 0-30V/0-3A - eBay (item 380190160888 end time Dec-30-09 14:42:05 PST)

Nate , that supply looks very similar to the one stocked by circuit specialists.

3506.jpg

Schematic and Product link

..dB

....similar price however too :(

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I've bought an HP oscillator from that seller before. They are as honest as they can be (too low prices to really test something). Their shipping costs are also reasonable. Note the meter defect they mention. Don't know anything about that specific meter, but it's nice that it has a triple supply where all three appear to be variable (most have a fixed 5V and two variable).

My best luck has been with craigslist buying old HP supplies, which are bulletproof. They are heavy and not easy to ship carefully and cheaply. However, outside of Silicon Valley, these are not so easy to come by locally.

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