Electronics > Beginners

Charging

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sleemanj:
The plate on the left of your picture looks like a single plate selenium rectifier (what we would now use a diode for), it may well not be doing much in the way of rectification any more.


You may find this of use:
http://anoldtechniciansworkbench.blogspot.com/2013/01/one-amp-battery-charger.html

jmelson:

--- Quote from: sleemanj on November 30, 2019, 12:01:47 am ---The plate on the left of your picture looks like a single plate selenium rectifier (what we would now use a diode for), it may well not be doing much in the way of rectification any more.

--- End quote ---
it may also be working fine, just too leaky to show up any DC on a 1 Meg Ohm scope input.  Try putting a load like a 20 Ohm resistor (value not at all critical) or a car turn signal bulb on it as a load and try the scope again.

Jon

james_s:
That's exactly what I was going to suggest, put a load on it, IIRC those old selenium rectifiers are pretty leaky.

I would probably replace it with a modern diode if I were going to actually use the charger. If the selenium rectifier fails, which they sometimes do, you'll never forget that awful smell.

Ben sage:
I just found out from my dad that we have two of these chargers and this is the broken one So the one I tested does work but not this one and thanks guys for the great comments

james_s:
Replace the selenium rectifier with a sufficiently rated diode and that will fix it right up, there's not really anything else to go wrong.

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