Hi,
I hope you don't mind a non-audio question...
I'm repairing an SMPS from a PC for a friend in which an electrolytic cap had bulged. It's a 2200uF 10V jobby which is quite narrow. I can only easily get 'normal ESR' caps that will fit in the tiny space available without having to mail order. (the main failure is just a broken solder join in the main 240V power circuit).
In your opinions, will the additional ESR really make a noticeable difference in one cap out of about 20 on the board? I know you guys don't know where it is in the circuit, but generally what do you reckon?
Cheers
Stuey
I hope you don't mind a non-audio question...
I'm repairing an SMPS from a PC for a friend in which an electrolytic cap had bulged. It's a 2200uF 10V jobby which is quite narrow. I can only easily get 'normal ESR' caps that will fit in the tiny space available without having to mail order. (the main failure is just a broken solder join in the main 240V power circuit).
In your opinions, will the additional ESR really make a noticeable difference in one cap out of about 20 on the board? I know you guys don't know where it is in the circuit, but generally what do you reckon?
Cheers
Stuey
Stuey,
I suspect that the 2200mF 10V cap is at the +5V output, possibly accompanied by a twin 2200mF 10V cap. (Most likely, the +3.3V output is filtered by 6.3VDC caps). Since this is the highest current output of the power supply, ESR is critical here, else the manufacturer would have opted for the cheaper normal-ESR units. Stick with the low-ESR units.
From DigiKey, try either of the following Panasonic FC-series Low-ESR electrolytic Caps:
DigiKey Part # Description
1) P10230-ND 2200mF, 10V, 12.5mm x 20mm. $0.90 each, $5.90 for 10
2) P11189-ND 2200mF, 10V, 10mm x 30mm. $1.20 each, $7.60 for 10.
If the 12.5mm (0.5 inch diameter) unit doesn't fit, then the 10mm unit definitely should.
Hope this helps,
Steve
I suspect that the 2200mF 10V cap is at the +5V output, possibly accompanied by a twin 2200mF 10V cap. (Most likely, the +3.3V output is filtered by 6.3VDC caps). Since this is the highest current output of the power supply, ESR is critical here, else the manufacturer would have opted for the cheaper normal-ESR units. Stick with the low-ESR units.
From DigiKey, try either of the following Panasonic FC-series Low-ESR electrolytic Caps:
DigiKey Part # Description
1) P10230-ND 2200mF, 10V, 12.5mm x 20mm. $0.90 each, $5.90 for 10
2) P11189-ND 2200mF, 10V, 10mm x 30mm. $1.20 each, $7.60 for 10.
If the 12.5mm (0.5 inch diameter) unit doesn't fit, then the 10mm unit definitely should.
Hope this helps,
Steve
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