My bench power supply.. - Page 8

deepanger · 18th February 2003, 04:43 PM

well, about the filter capacitance.. ive read achapter in a good
book (its about linear IC circuits) in a chapter dealing with the
powersupplies. that i only need about 1000uF of filter capacitance
and it recommends 2000uF per 1A !!
so am in confusion

anyway ive found a good brand of 50V 10,000uF capacitors ,so
ithink ican put about 30,000uF into each rail so when mesured
ill get about 1.6V ripple at 5A ,ithink its acceptable..

and sure to get the 5A output ill use the pass transistor (2N2955)
and substitute the 2 transformers with a more powerful ones (maybe 10A ratings)..

so anything iforgot before buying the new items?!

traderbam · 18th February 2003, 07:56 PM

Sounds good. You might want to add a couple of 1W, 1kohm resistors to your shopping list. Put one across each bank of 30mF caps to ensure their energy is drained away safely after the supply has been switched off.

18th February 2003, 04:43 PM	#71
deepanger diyAudio Member Join Date: Nov 2002 Location: Egypt	well, about the filter capacitance.. ive read achapter in a good book (its about linear IC circuits) in a chapter dealing with the powersupplies. that i only need about 1000uF of filter capacitance and it recommends 2000uF per 1A !! so am in confusion anyway ive found a good brand of 50V 10,000uF capacitors ,so ithink ican put about 30,000uF into each rail so when mesured ill get about 1.6V ripple at 5A ,ithink its acceptable.. and sure to get the 5A output ill use the pass transistor (2N2955) and substitute the 2 transformers with a more powerful ones (maybe 10A ratings).. so anything iforgot before buying the new items?! __________________ ((DeepBass = DeepAnger))

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18th February 2003, 07:56 PM	#72
traderbam diyAudio Member Join Date: Jan 2002 Location: Earth	Sounds good. You might want to add a couple of 1W, 1kohm resistors to your shopping list. Put one across each bank of 30mF caps to ensure their energy is drained away safely after the supply has been switched off.