Capacitor discharge unit

[LesterL]

Many years past there was an article in Model Railroader Magazine with the schematic diagram of the CDU. Does anyone have that schematic . I made one and now I need to repair it, but I don't have the schematic.

 

[wvg_ca]

there are a couple of different types, just a cap, resistor, and [maybe] a diode ... to ones that have a transistor, or two, or three on the final pass end ??
what is yours?

 

[LesterL]

It has 3 each diodes, one transistor, 1 cap 2500 ufd and 1 ea 330 ohms .5 watt resistor

 

[wvg_ca]

what seems to be damaged ?

 

[LesterL]

Nothing seems to be damaged. It just doesn't work anymore

 

[Hobbytronics]

I make cap discharge circuits if you need one let me know.

 

[Hobbytronics]

If you can take a close up picture of it I will try and help you out with it.

 

[wvg_ca]

the -most- common is for the transistor to go bad ... do you have a transistor tester, or failing that, a replacement transistor ?
the diodes and resistor can be checked out of circuit with a multimeter