Attached is a schematic of the output stage of a power amp. If one of the power transistors was blown, would that channel be dead or would it still function?
The problem is, is that you don't really know what the question is.
Define 'Blown'.
Which of the many possible states of 'Blown' is this transistor ?
If you can't do that, then you have no hope of ever answering your question with any certainty.
Define 'Blown'.
Which of the many possible states of 'Blown' is this transistor ?
If you can't do that, then you have no hope of ever answering your question with any certainty.
Strictly speaking what you posted was half of an output stage for a power amplifier.
More often than not, power transistors fail by turning into "monodes", that is to say they short. If that were the case, no, the amplifier would not work. Best case scenario is it would just trip a protect circuit. No harm, no foul. At worst the shorted transistor would dump the DC bus into your woofer's voice coil, turning it into a charcoal briquette.
More often than not, power transistors fail by turning into "monodes", that is to say they short. If that were the case, no, the amplifier would not work. Best case scenario is it would just trip a protect circuit. No harm, no foul. At worst the shorted transistor would dump the DC bus into your woofer's voice coil, turning it into a charcoal briquette.
In this case, the transistor was blown off the circuit board by a very strong cooling fan.
Blown can mean many things, some of which would be off limits for a DIY Audio post. 😎
the transistor should be MJ15024 in TO3, but it should be fixed by screws and not easy to blown off.
Please show us picture and we can try to estimate the damage.
Here it is. The transistor was blown out of the amplifier, broke a window and landed in a tree in my yard.
Attachments
A blown transistor can blow in a few ways.
CE, BC or CB or BCE shorted. Or something open circuit.
If both go shorted the fuses should blow.
If one blows open you can sometimes still get an output but distorted.
Just test outputs in circuit and see what you find, that will give a big clue as to what is going on.
You need to work out why it blew as sometimes just replacing it results in another blown transistor.
Could be a bias or DC offset circuit fault.
Or could be a driver transistor gone taking output with it.
So i guess the strategy is to look around and see what has failed and judge what to do from there.
CE, BC or CB or BCE shorted. Or something open circuit.
If both go shorted the fuses should blow.
If one blows open you can sometimes still get an output but distorted.
Just test outputs in circuit and see what you find, that will give a big clue as to what is going on.
You need to work out why it blew as sometimes just replacing it results in another blown transistor.
Could be a bias or DC offset circuit fault.
Or could be a driver transistor gone taking output with it.
So i guess the strategy is to look around and see what has failed and judge what to do from there.
In other words the op is just wanting to waste everyone's time with nonsensical rubbish.
Congratulations You've just been put on my ignore list.
Congratulations You've just been put on my ignore list.
UserAbuser - he named himself well. Thanks to most everyone else for the intelligent answers to my question.
No, because at least a few of us have a surplus of time right now. I got a good laugh out of this thread, which is something that I definitely needed right now.
But even you show us your amp pictures, we may not easy to judge your amp is ok or not.
Maybe you connect your amp with a DBT(dim bulb tester) circuit and live test your amp, maybe it is ok, good luck!
Maybe you connect your amp with a DBT(dim bulb tester) circuit and live test your amp, maybe it is ok, good luck!