Hey all - I’m nearly done this one, but having trouble wiring up both the psu transformer and the output transformer.
I do not have schematics or a layout (save for the board), so am getting list and don’t want to fry anything doing the trial and error type testing I’m capable of!
It’s an API style build with EA2503 output transformer (need help with wiring to this board).
The PSU toroid is dual 115v, with two whites and two blacks, and dual 25v secondaries with two reds and two blues. No part number, but it looks Slovenian.
I want to wire for 120v (North American), so would i just use one black and one white, and then just one blue and one red?
On the psu board, it just labels the pins as 1, 2, 3, 4, 5, 6, G, G.
Wish I had the schematics, but if you have a clue, I’d appreciate it!
Has anyone put this mic pre together and know these two answers?
Here is a shot of the transformer and board - no label on the pins of the transformer header.
Thanks for any nudging/advice!
And here’s my attempt (minus the grounds yet) for the psu.
Totally confused, but I’m hoping/assuming that brown lead is pin 1.
Again, without the layout and schematic, I’m flying blind (for my ability, I’m sure many of you out there can do this asleep!).
I do not have schematics or a layout (save for the board), so am getting list and don’t want to fry anything doing the trial and error type testing I’m capable of!
It’s an API style build with EA2503 output transformer (need help with wiring to this board).
The PSU toroid is dual 115v, with two whites and two blacks, and dual 25v secondaries with two reds and two blues. No part number, but it looks Slovenian.
I want to wire for 120v (North American), so would i just use one black and one white, and then just one blue and one red?
On the psu board, it just labels the pins as 1, 2, 3, 4, 5, 6, G, G.
Wish I had the schematics, but if you have a clue, I’d appreciate it!
Has anyone put this mic pre together and know these two answers?
Here is a shot of the transformer and board - no label on the pins of the transformer header.
Thanks for any nudging/advice!
And here’s my attempt (minus the grounds yet) for the psu.
Totally confused, but I’m hoping/assuming that brown lead is pin 1.
Again, without the layout and schematic, I’m flying blind (for my ability, I’m sure many of you out there can do this asleep!).
Last edited:
