Anyway the problem i am having is with the resistor R11 Blowing when the variable capacitor C17 is even slightly moved, It almost seems to me as tho to much voltage is getting into the resistor (im not sure) Anyway i spoke to the designer of the transmitter and here is what he recomended
I was wondering if anyone on here in the know, maybe able to shed some more light on it for me.Hi
Hmm this sounds strange. I never tested the unit with 2sc1972 so i don't know how it would behave with this transistor, but here are things you should check:
1. C17 - make sure it's good and not shorted (these variable capacitors are weak and tend to short after some time).
2. T14 - 2sc1972 - make sure it's in the correct position and the legs are soldiered correctly. I attached you the datasheets of both 2sc1971 and 2sc1972.
3. If T14 is soldered correctly, then check if it's not dead, these transistors tend to die fast...in my early experiments with the unit i burned like 4 of them in a row ..XD. A dead transistor can possibly be shorted and thus burning R11.
4. I am not sure about the Base-collector resistance value of 2sc1972, can u try with 2sc1971? If it works then we'll know it's not the rest of the unit.
I would have attached the datasheets for the 2SC1971 and 2SC1972 transistores but this forum dos'nt allow it