Bare Knuckle Pickups Forum
Forum Ringside => Tech => Topic started by: psy on September 10, 2012, 11:55:58 AM
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Hi,
Does anyone know where I can find a circuit diagram for a Carslbro PM10 stage monitor? A cap has blown & I can't find the outer casing to see what size it was to replace it.
Cheers,
Simon
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Have you tried calling Carlsbro? - not trying to be a smart arse, but thats the most direct route imo.
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No, not yet. I was hoping to just find a schematic online somewhere. I'll try giving them a bell, they might even know why the capacitor in the same position has exploded twice now. :)
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I firstly assume the cap is an electrolytic.
If it's a signal/ decoupling cap, then it will most likely expire due to over voltage, although it can also expire if it is near a source of heat.
It is a filter cap it could also expire due to poor ripple current rating, which causes self heating.
I've seen quite a few piece of equipment where the voltage compliance of the caps is exceeded in normal use.
When you replace the cap I would go for 105degC cap (regular caps are rated at 85degC; all things being equal the 105degC cap will last 4 times as long as the 85degC cap) rated at a higher voltage.
Of course there could be another problem with the unit which is causing the cap to expire, but I would go down the uprating route first.
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Hi JPF, yeah it's an electrolytic cap. Thanks for the tip on using one rated for a higher temperature. I remember it being 100v, but I don't remember the other figures on it at the moment. As a general rule would putting a cap rated for a higher voltage in be a bad idea? Just thinking if that couple with a higher temperature rating might double my chances of it not blowing again.
Cheers,
Simon
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Higher voltage rating is fine.
Lower not so good......
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Higher voltage rating is fine.
Lower not so good......
Good for bonfire night :lol: