I zapped my subwoofer with static electricity
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Posted by Hangglider on February 6, 2006, 10:04 am
Please log in for more thread options I was at my office and a small spark of static electricity from my hand has killed my subwoofer. The unit is UNGROUNDED...I can hardly believe it, but it is. It has it's own power supply and a relatively simple amplifier. I intend to add a ground to the unit! If I plug in the unit, I get a hum and that's it. It doesn't matter if there is an input plugged in or not. Does anyone have any recommendations as to which components I should try replacing first? Here is a listing of the components on the board: Transistors: TRANS PWR NPN 10A 60V TRANS PWR PNP 10A 60V TRANS PNP GP 800MA 45V TRANS NPN GP 800MA 45V Capacitors: CAP 4700UF 25V ALUM ELECTROLYTIC RADIAL (2 for the power supply) CAP .47UF 50V ELECTROLYTIC KMG RAD CAP 470UF 25V ELECTROLYTIC SMG RAD CAP 10UF 25V ELECTROLYTIC SMG RAD CAP .0012UF 50V POLYESTER CAP .0027UF 50V POLYESTER CAP .1UF 50V POLY B SERIES Resistors: RES 4.7K OHM 1/4W 5% CARBON FILM RES 47K OHM 1/4W 5% CARBON FILM RES 220K OHM 1/4W 5% CARBON FILM RES 150 OHM 1/4W 5% CARBON FILM RES 100 OHM 1/4W 5% CARBON FILM IC: IC OP AMP HI PERFORMANCE 8-DIP Any advice is greatly appreciated! Thanks, Joe | ||||||||||||||||
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Posted by John Popelish on February 6, 2006, 11:33 am
Please log in for more thread options Hangglider wrote: (snip) > If I plug in the unit, I get a hum and that's it.
(snip)
> Here is a listing of the components on the board:
> > Transistors: > TRANS PWR NPN 10A 60V > TRANS PWR PNP 10A 60V > TRANS PNP GP 800MA 45V > TRANS NPN GP 800MA 45V > > Capacitors: > CAP 4700UF 25V ALUM ELECTROLYTIC RADIAL (2 for the power supply) > CAP .47UF 50V ELECTROLYTIC KMG RAD > CAP 470UF 25V ELECTROLYTIC SMG RAD > CAP 10UF 25V ELECTROLYTIC SMG RAD > CAP .0012UF 50V POLYESTER > CAP .0027UF 50V POLYESTER > CAP .1UF 50V POLY B SERIES > > Resistors: > RES 4.7K OHM 1/4W 5% CARBON FILM > RES 47K OHM 1/4W 5% CARBON FILM > RES 220K OHM 1/4W 5% CARBON FILM > RES 150 OHM 1/4W 5% CARBON FILM > RES 100 OHM 1/4W 5% CARBON FILM > > IC: > IC OP AMP HI PERFORMANCE 8-DIP The only one of those components likely to be damaged by static is the op amp. But you are going to need more information than you have given us to find a replacement. | ||||||||||||||||
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Posted by Hangglider on February 6, 2006, 12:20 pm
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I actually looked up the part number and it is DigiKey part number LM741CNNS-ND. It's pretty cheap. Actually, all the parts on that listing I looked up using various online sources and found all the parts at DigiKey. They are all pretty cheap. I actually thought about just buying all the parts and building a new one for the heck of it. I can get most of it for about 20 bucks. The only thing that was difficult to figure out was the "green" capacitors. They were marked 104J. I determined that this meant they were .1 microF with a +/- tolerance of 5%. I think they are "Polyester Film" because through all the digging and scrounging, they seem to be one of the few capacitors that have that tight tolerance and physically look like the ones on my board. Thanks for taking the time to reply! Joe | ||||||||||||||||
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Posted by jfeng@my-deja.com on February 6, 2006, 6:27 pm
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Hangglider wrote: > I actually looked up the part number and it is DigiKey part number
> LM741CNNS-ND. If you want instant gratification, you could get this at your local Radio Shack: LM741CN Operational Amplifier 8-Pin Dip Catalog #: 276-007 $0.99 | ||||||||||||||||
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Posted by Hangglider on February 6, 2006, 9:41 pm
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Wicked cool. I had one already. I swapped out the op amp...FIXED! Thanks guys! Joe | ||||||||||||||||
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