Electronics > Beginners

Benchtop Power Supply

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ECEdesign:
Take a look on eBay for some of the older HP E series power supplies.  They are really great supplies and you can snag them for pretty cheap.

LabSpokane:

--- Quote from: ECEdesign on May 23, 2016, 03:41:10 pm ---Take a look on eBay for some of the older HP E series power supplies.  They are really great supplies and you can snag them for pretty cheap.

--- End quote ---

I just bought two E3610As for $50 each off eBay. They are in near perfect condition. That's a rare deal, but it is possible to snag a good power supply cheap.

10101:
If you still want a diy design, idk if these two are good (they look awesome though  ;D) but i'm going to let more experienced people comment on that  :-+

1-2 amps versions:

https://www.eevblog.com/forum/projects/diy-bench-power-supply-psl-24012/

4 amps version:

https://www.eevblog.com/forum/projects/diy-bench-power-supply-psl-3604/

Blisk:
Can anyone help me calculating how to get 12V out of XL7005A input voltage is 60V.
I have calculated 30Kohm and 3Kohm resistors but I get 2V output!

mvs:

--- Quote from: Blisk on January 15, 2019, 02:55:49 pm ---Can anyone help me calculating how to get 12V out of XL7005A input voltage is 60V.
I have calculated 30Kohm and 3Kohm resistors but I get 2V output!

--- End quote ---
With 3K and 30K you should have either 1.25*(1+3/30)=1.375V or 1.25*(1+30/3)=13.75V, depending on the positions of your resistors.
For 12V, you may choose 3.9K and 33K  1.25*(1+33/3.9)=11.82V

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