Electronics > Beginners
DIY power supply
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MarkF:
can i put n led on a negative volt rail?
   Yes.  But you need to reverse the polarity of the LED.

what about the polyswitch?
   Do you mean polyfuses?
   These:  https://www.mouser.com/ProductDetail/Littelfuse/60R065XPR?qs=sGAEpiMZZMsxR%252bBXi4wRUCTGuoKQj3D%2fWlrADHdQXLA%3d

This diagram might help (Again you may not need the load resistor for the supply to turn on):

   
havewattwilltravel:
One thought: You can get really cheap low voltage digital voltmeter+ammeter boards on Ebay, which allows you to watch several channels simultaneously and still have a meter free.
Pirateguy:

--- Quote from: MarkF on August 24, 2018, 01:09:00 am ---can i put n led on a negative volt rail?
   Yes.  But you need to reverse the polarity of the LED.

what about the polyswitch?
   Do you mean polyfuses?
   These:  https://www.mouser.com/ProductDetail/Littelfuse/60R065XPR?qs=sGAEpiMZZMsxR%252bBXi4wRUCTGuoKQj3D%2fWlrADHdQXLA%3d

This diagram might help (Again you may not need the load resistor for the supply to turn on):

   

--- End quote ---

ahh thanks :)


--- Quote from: havewattwilltravel on August 24, 2018, 01:55:34 am ---One thought: You can get really cheap low voltage digital voltmeter+ammeter boards on Ebay, which allows you to watch several channels simultaneously and still have a meter free.

--- End quote ---

yeah mean the panel mount ones?
yeah i got 2 of those, but for the fixed outputs i don't really need one i think.
anyways i'd have to either have 3 of them or have a switch for it, and i have no room for that.
i did put in a temp display though, and the variable psu ill make after this will have a meter in it.
MarkF:
I missed the 3.3V Sense wire (Brown).
It needs to be tied to one of the 3.3V Output wires (Orange).

   
Pirateguy:
lol no worries. my atx has neither 3.3v nor 3.3v sense wires :P
i added a step down module to get the 3v.

i also don't have a power on wire that i can see...

so it looks like my first planned upgrade will be a double pole version of the power switch :P
hopefully the chinese won't make me wait too long...

in any case here she blows:


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