Quote:
Originally Posted by jeff5may
Xringer,
Good eye seeing TH02. It looks to be a thermistor (probably PTC like a deGaussing coil in a crt tv) wired across that mains relay. It could be the standby power bleeder component that bootstraps the rectifier bridge with just a little power. Then again, it could be just an inrush current limiter for when the power is applied(to precharge the big caps). Either way, since it is there, you should have some current bleeding through to that rectifier bridge and PFC network (enough to get 12-15 volt standby b+ and maybe regulated 5V out of the tinyswitch).
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I'm thinking THO2 might be the Bootstrap.. Not sure, since I have no clue, what's under the plastic box..
So, I'm thinking about tacking a 12k Ohm 5 or 10w resistor across THO2, (mains relay) just to see what happens when the 230Vac hits it.. I think 12k should allow about 20ma to flow down into the diode bridge..
That might be enough to generate some DC out of the tinyswitch.?.
What do you think? Worth a try?
I found some 5W 24k resistors.. I could solder one in and try it with very low amps,
if nothing twitched, drop another 24k on top, to make it 12k..
24000 Ohm 24K 5 Watts 5W 5 Ceramic Cement Power Resistors Qty 3 | eBay