Hi everyone
I have recently built a 3 valve mains powered TRF medium wave reciever.
Both HT and LT supplies are derived via an HT/LT transformer, the HT using resistor/capacitor smoothing.
After testing, the set was found to perform very well.
However after a few days of half an hours operation each day the set is developing serious mains hum.
The HT secondary on the mains transformer is of the centre tapped variety with an ac voltage of 270-0-270 (no load) the centre connection going to ground. The other two leads each have a 1n4001 rectifier in them which then go into a 47mF 450v smoothing capacitor.
My question is this:-
I have no data on the 1n4001 but my suspicions are that they are breaking down due to the reverse voltage against them, can anyone confirm this and tell me what diode is required and calculate the reverse voltage against them?
Many thanks
Lee