I came across this old transformer without labels or wires and I tried to measure resistances,but all I did was confuse myself. I am guessing pins 1 and 3 are the primary connections, but I need conformation. Can you tell by this information which pin is which
Hello @mikecasey,
Difficult to tell from a sketch.
-
I’ll assume this is a tube-type power transformer based on our previous conversations.
-
It is possible that pins 1 - 2 - 3 are a center tap mains input. However, this could also be the high voltage output section.
-
It is also possible that 5 - 5 - 6 - 7 are a universal 120 - 240 VAC input. The jumper hints at a 240 VAC configuration.
Unfortunately, I can only speculate.
Do you have any additional information, an image, or wire colors. Twisted wire pairs are also a useful thing to know.
Sincerely,
Aaron
No I don’t have anything else. Thanks for your help
Understood, Mike.
I’d hang onto the transformer.
You may discover patterns that will allow you to text the transformer.
Sincerely,
APDahlen
I think I’ve got it. Pins 1 and 2 are HV . 4 and 7 are primary. 8 and 9 are 6.3 and 11 and 12 are 5v . Does that make sense?
I have another question. The dog house. Why do they number the caps from right to left. When it is more logical to number them from left to right. Regardless of which one is first in the signal path.
That is a reasonable assumption for the transformer. It assumes something like a 5R4 rectifier is used.
As for the capacitors, the schematics were often compressed to a single page. The left to right layout was often broken to save space.