UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Thandar Function Gen Cutout Mains transformer

llama · 24th Jun 2016, 4:23 pm

I've just run the transformer alone, via the lamp limiter, into a 110 Ohm resistor on each of the secondaries in turn. 16.5 Volts was developed across the resistor which of course got rather hot. The transformer, however, remained cool.

So I guess the problem is downstream.

Kevin, could you describe the mechanism whereby an open circuit (or low capacitance?) reservoir capacitor can cause overheating, please? I could possibly tack another in parallel, topside, as a cure.
Graham

24th Jun 2016, 4:23 pm	#7
llama Octode Join Date: Jun 2006 Location: St Osyth, Nr Clacton, Essex, UK. Posts: 1,482	Re: Thandar Function Gen Cutout Mains transformer I've just run the transformer alone, via the lamp limiter, into a 110 Ohm resistor on each of the secondaries in turn. 16.5 Volts was developed across the resistor which of course got rather hot. The transformer, however, remained cool. So I guess the problem is downstream. Kevin, could you describe the mechanism whereby an open circuit (or low capacitance?) reservoir capacitor can cause overheating, please? I could possibly tack another in parallel, topside, as a cure. Graham __________________ Half my stuff is junk - trouble is, I don't know which half!