05-02-2026, 09:54 AM
Ron
I know this circuit; we had a discussion where Rod pointed to it about a week ago. There are the calculations also.
https://philcoradio.com/phorum/showthrea...445&page=2
If by resistance you mean the U/I across the TIP50 transistor, you do not need it, it is U*I, and you should know both.
I mean, if you know for a fact that it feels warm and not hot, then you are good. I just like measuring stuff to know exactly whaty the operation is like. And, to remind, as the ambient temp rises, so does the operating temp of the transistor.
I know this circuit; we had a discussion where Rod pointed to it about a week ago. There are the calculations also.
https://philcoradio.com/phorum/showthrea...445&page=2
If by resistance you mean the U/I across the TIP50 transistor, you do not need it, it is U*I, and you should know both.
I mean, if you know for a fact that it feels warm and not hot, then you are good. I just like measuring stuff to know exactly whaty the operation is like. And, to remind, as the ambient temp rises, so does the operating temp of the transistor.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
