bone china 50uFI'm imagining skotl turning his cups upside down for the last 30 minutes looking for markings!!
I'm Scottish - I have no need for bone chinabone china 50uF
should last well then, no leaksI'm Scottish - I have no need for bone china
They're thick porcelain, 100nF
should last well then, no leaks
ahh capacitive how many fluid ouncesAnd withstands immediate increase in ambient temperature from 17C to 100C in less than two seconds, without damaging its capacitive performance!
ahh capacitive how many fluid ounces
...for scale, fools.Like the cup in the two photo`s,did you check their values?
Aaaaaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhh...........................!...for scale, fools.
The photo lies. The board is in good shape - a lot of carbon splatter but it seems to be pretty localised.Looks like a burnt board under ferrite \ toroidal choke to me unless the photo lies
This is one of the well known kits, I've only spent about 70 quid to get a similar thing, if your interested look up Wein Bridge Theremin
I had a look at the core and it seems fine - charred, but fine. The winding is, as expected, 0 ohms and apart from that there's not really much to go wrong with a ferrite core, is there?
The transformer showed no visible signs of physical failure but I'll check the windings with the meter.
Cheers. Waiting for the diodes to get here via the American pigeon, then I'll have a good look at the board. I'll de-solder the core and check it before putting it back (assuming it's not knackered, of course!).Ferrite cores sometimes crack from shock and stop working as a homogenous component. HT transformers in some kit we use have been known to die in such a fashion, can be a bu99er to diagnose until you spot the hairline crack...
Cheers Started off as an electronics engineer ~30 years ago but then moved into IT. The biggest difficulty I've come across is that my eyes can't see the sodding connections any more!That all looks very brave to me.