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Hey guys, that's what I was thinking. I posted some pics of the device after I removed the diode bridge pcb that was on top of it. I can now see where my + and - is supposed to go out to my switching transistors. The L and N is line and neutral I imagine, and then the smaller transformer...

It's the black rectangular piece in the first picture. I am not sure exactly how old this SMPS is, because I cannot find any papers on the Gould MG15-16c It seems odd to be a transformer. There are two conventional looking transformers in the other parts of this SMPS. I've seen one of these or...

I contacted gould for a schematic as they are the manufacturer, but they never got back to me. Judging by the components this unit is probally from the 70's. 12 volt switch mode power supply. Some wires came loose and I hooked them back up based on my assumed color scheme of 110 in blue/brown...

Skogsgurra, I see nothing in this thread against site policy. A forum is a place to lend your knowledge to others faced with questions and discuss topics of interest. I had a question for personal use and design. That's what I plan on doing, accuracy in this section shouldn't be of much...

I forgot to add D102 is what we're looking at it's below the inductor(covered with heatshrink) on the top pcb picture. And on the bottom pcb picture it's near the bottom right (to the left of where the wire tie goes through the board) Most of the bad diode looks to be glass compared to the...

http://www.bright.net/~jarc is the link to my pictures. The two diodes grouped together are the 4148's and the smaller one with the thick glass case is the chinese bad diode. Come to think about it they use g-luxon caps in this thing and the only decent brand of components I see are the ST...

I just got my 4148's in - this is definately not a 4148. The case is larger than the 4148. I will try to get some good pictures and I will post a link soon if anyone is interested in solving this mystery.

I described the circuit above, I do not have a diagram, I could take some pictures though.

All the diodes on this board measure an equal voltage on each side. This particular diode measures 2.3volts anode (+lead of dmm) to cathode (-lead of dmm) and of course with leads reversed measures -2.3volts This diode connects between the emitter of a pnp (cathode) and the emitter of an npn...

I forgot I had a good board laying on the parts shelf. The diode measures 649 ohms and on the silkscreen it has a normal diode symbol not a zener symbol - I guess that's not saying much for this chinese outsourced board though. The supply itself has two rectifier bridges with Ac in(2) and DC +...

Well, what can I do at this point? All I have to identify the diode is the numbers on the case and the physical dimensions of the case (4mm length and approximately 1.5mm in diameter)

It's dead so it has no conductivity. I didn't think it was a zener or a dual, but based on the numbers on the case that's all I could find. I was thinking of just replacing it with a 1n4001 or 1n4148, 1n4149 It's in a power supply for a solid state audio amplifier so I guess it's pretty...

It has a glass case - orange core with blue kathode band It reads "3" then under that it reads "2c" From my searches I can only find a "23c2" dual zener diode on mouser.