Electronics > Beginners
Transformer voltage for dual power supply (+12V / -12v)
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Ian.M:

--- Quote from: belzrebuth on August 26, 2018, 01:22:07 pm ---Could you recommend a particular schottky package that would fit my needs?

I've never used those so I'm a bit clueless on what to get.
I've only seen them on SMPS power supplies I think..

--- End quote ---

This looks good: https://www.tme.eu/gb/details/stps1045fp/tht-schottky-diodes/st-microelectronics/
45V 10A Schottky in a two pin Iso-TO-220 package.

Bend their legs up at right-angles just beyond where they neck down, bolt four down on a smear of heatsink compound using a plain washer + a thin belleville or crinkle washer on top for even clamping pressure (a spring washer is a poor but usable substitute) and wire up as follows:



Use solid wire for the links and sleeve the +DC and -DC ones.  It should be reasonably neat.
David Hess:
Something like a 1N5822 which is 3 amps would be my first choice.  Use a terminal strip to wire the diodes in the air and mount them to the chassis.
belzrebuth:
Thanks Ian.Much appreciated :)
Ian.M:

--- Quote from: belzrebuth on August 26, 2018, 02:20:04 pm ---I've just discovered that I also have two identical toroids (also 12V).
These output 13.8V unloaded.

They're 50VA each so I could maybe try those two for a 2x12V substitute.
I think I have other transformers laying around too but they're not toroids..

I really need to get the psu board populated in order to perform some hands-on tests (I could monitor the voltage while turning the air conditioner on for example).
Getting a new transformer is not that expensive but I wouldn't mind trying if what I've already have works..

--- End quote ---
Time to do some load testing.  12V 20W G4 halogen bulbs will do nicely for test loads assuming you are shooting for 1A DC out from the finished PSU.   You can hook them up with croc clip leads and put them on a ceramic tile if you are only doing a short test, but its worth buying some ceramic G4 bulb sockets  if you want to do a longer test or for future use.
belzrebuth:
First thing tomorrow I'm off to buy those bulbs.
It's Sunday I won't be finding any shops open today..
And I've loaned most of my high wattage resistors to a friend that needed to load-test some PSUs so I only have a 100W 20Ω here ::)
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