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Old 7th June 2011, 07:07 PM   #1
us3rx is offline us3rx  United States
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Join Date: Jun 2011
Default capacitor value help

Hello all,
I'm needing some input on possible replacement values for an Arp pro/dgx bipolar power supply.
Can I use a different value than the 250mf cap spec'd for C5 and C1?
It seems to me that I could go higher without adverse effects, possibly might improve ripple?
I would also like to change out C6 and C7. I have a variety of caps available other than the ones on the power supply.
Currently only the +15v seems defective only outputting +6.25v dc.
When I set my VOM to auto it fluctuates between the ac and dc scales. AC reads 7.5v and then jumps to dc.
Is this a possible symptom of unfiltered output coming from bad cap (C1)?
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Old 8th June 2011, 10:38 PM   #2
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Location: Carlisle, England
I wouldnt venture too far from the recommended capacitor values.

The noise on the output could be a capacitor.
There arent many I would change all electrolytics if it is an old power supply.
Murton-Pike Systems PCBCAD51 pcb design software.
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Old 9th June 2011, 12:24 AM   #3
BZed is offline BZed  United States
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Check the doides. It sounds like you may have a bad one.
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Old 12th June 2011, 11:47 AM   #4
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It is a ua723 voltage Ic regulator .

So you have to check first the input input voltage accros Ci, I think some 20V DC,

After that, check the reference voltage of the ua723 = 7,23V , pin 5. If it is OK

Check the voltage accros the current limiting resistor , much lower than 0,6V, if not lower than 0,6V , than disconnect the output capacitor C4 is may be a short circuited and replace it
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