Well, I dont think it was the regulator, since you said you played it on a high note for an extended time. Do you know how to attack small heat sinks on chips? If so, that would really help. Normally such equipment has an onboard copper plating during the schematic layout which acts as a secondary heat sink, but you never know with electronics.
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Spock, I did replace all of them. I got them from Fairchild vendor website for .60c a pop. I replaced all 10 of them because almost all of them were so burnt that the 3 wires that connects to the boddy of the resistor, they were worn out of those plastics. So i have changed em but i havent gotten my car back as of yet so i wouldnt know if it is properly working rite now or no. I can have 12 V DC adapter and work with it but i dont have that many of amps rite now.
Kamran Thanx for your help, but i got these bad boys fairly cheap. As spock and you said about the heat sinks. I do have the heat sinks for these resisotrs. I had them on em but i took them off so i could take the picture of these transisotrs. and they were not ground because there is cloth/plastic kind of thing at the bottom of these resisotors, resisting them from the body of the amp. So yea, there are heat sinks for these things
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Now my only question is .. WHAT MADE THESE THINGS BURN ? Was it because of me playing them on a higher note ? I kinda shady about that feeling, But anways.. anybody would know what else might have burnt with these things besides the transisotrs ? and how would i know if they have ?
-Salman
Yeah, you should be careful with the heat sinks, but from what I make of in the diagram, you can attach them safely. btw, how much did the entire replacement cost you? Salman, I think youre all set, if you got those heat sinks attached. Lets hope everything holds!
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*Originally posted by Spock: *
Yeah, you should be careful with the heat sinks, but from what I make of in the diagram, you can attach them safely. btw, how much did the entire replacement cost you? Salman, I think youre all set, if you got those heat sinks attached. Lets hope everything holds!
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Everything was around about .. umm hold up let me see my paypal thingie....yea 24 with shipping.. not bad for overnight delivery....
Ummm do tell me again man, why should i be careful with those heatsinks ? If i put em wrong can they burn em again or something ?
-Salman
Everything was around about .. umm hold up let me see my paypal thingie....yea 24 with shipping.. not bad for overnight delivery....
Ummm do tell me again man, why should i be careful with those heatsinks ? If i put em wrong can they burn em again or something ?
-Salman
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If they heatsinks came with them, shouldnt be a problem then. Some of them have a contact at the top, which shouldnt be touched with a metallic contact, I remember I messed my Electronics I project because of this mistake. And Kamran Khan, you seem like an electronics engineer, give us an intro, there arent many engineers in this forum.
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*Originally posted by SalmanNY: *
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Ummm do tell me again man, why should i be careful with those heatsinks ? If i put em wrong can they burn em again or something ?
-Salman
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You are welcome ... Hmmm why should be you care with Heat sink.... I gather that the heat sink we are talking about here is a single body heat sink and the all MOSFETs are connected to it with an electrical insulation, the answer is right there that the all MOSFETS are not connected in same configuration, and they have different potential or signal to their Drains (Metalic TAB which is connected to the heat sink); if you are not careful with connecting them to heat sink you might end up with sshorting one or two MOSFETS, and the result would be a new amplifier :) or will cost you a fortune to fix it.
The reason why these components burn... well there acn be many reasons, I think you are using this amplifier for quite some time and as you said you use it frequently loud, again anser is just there, Higher tones mean higher power flowing through these (I assume from that pic that these mosfets are configured as tube amplifier) so higher the current higher the junction temperature, resulting in thermal breakdown. simple... in your case you were lucky that the thermal breakdown occured and these are working as an open circuit (no current flowing through the circuit) it could be worse if they were short (Peak current flowing through all the circuit resulting burning all the components in the path)
I strongly recomend to consult with any engineer before trying to fix that if you are not an engineer, because MOSFETS are very nasty babies, although they got high tolerance for current but zero tolerance if connected incorrectly. Good luck
PS: there should be at least one or two demaged capacitors in the circuit watchout for them.
Spock:- Yes i am electronics engineer, well Instrumentation engineer to be specific, worked with NRDA for 4 years and now am here in UK, got a job and doing my post graduation part time (although it will take two years more to finish my theses)