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dual power supply for +v &-v generation
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hussamaldean:
Hi all
I hope you are ok
anyway, I have lab bench power supply and I need to generate positive voltage rail and negative power rail for OP-AMP and I have also 24V power supply which I will step down converter to step the voltage to 12V
how shall I connect these two power supplies in order to get both positive and negative power rail ?
I hope you can help me though
MarkF:
If you just want to split the 24V supply and don't need a lot of power, you could do something like this:

   
hussamaldean:

--- Quote from: MarkF on October 24, 2018, 06:36:19 am ---If you just want to split the 24V supply and don't need a lot of power, you could do something like this:

   

--- End quote ---
is there any other way ?
because there is holiday here and no shop will be open for the next week
MarkF:
Do you have a MC7812 or MC7912 three terminal (positive or negative) voltage regulator to step-down the 24V?  You would then just wire the two supplies in series.

Depending on your voltage requirements, you could just wire a few batteries in series until you can get parts.
hussamaldean:
I just remembered that I made this power supply which I build like a year ago but I have not use it fir a while and I forgot it


it doesn't look the best but functionality is flawless ;)
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