Hello All,
I started constructing prototype of the below circuit, But 68ohm,2Watts resistance went to breakdown.
again i changed to 470ohm,2Watts , again it started smoking.
I also changed the MJE2955, but 470 ohm started smoking, What is the problem in the circuit?
How to find my transistor has went to breakdown?
Thank you all.
Hello there,
You are probably going to have to learn to troubleshoot these circuits yourself. That means making measurements with different loads, and possibly running the input voltage up a little at a time to see when the power dissipation starts to get too high in the resistor(s). You keep having this same problem with just about every circuit you work on like this. A resistor smokes in every circuit you posted so far.
To find out the problem you often have to take voltage and/or current measurements before anything smokes, and that means possibly with a light load and slowly increasing that load. If it happens even with light load, then you might have to turn the input voltage up slowly until the problem shows itself but does not blow anything out.
So to start see if it runs with no load. You don't seem to say what the load is when this happens, or even if there is a load or not.