Combining 2 power transformers to substitute 1 multitap power tranformer

[yekuku]

Hi guys,
I was given a Stanton RM-100 mixer without a psu in unknown condition  that I would like to test /repair.
The unit uses a multi tapped transformer with  2X15 VAC  and 1x12VAC( for powering the BNC lamp and driving the leds)  secondaries with common ground on all power lines
Unfortunately i dont have the original psu and i would like to power it on in order to check its condition.
I have a center tap transformer 2x15 VAC  and also another one that outputs 1x12VAC.
Can i combine these 2 for powering the unit on?
What I mean is , is it safe to connect the center tap of the 2x15 to one output of the 1x12 ?

 

[ruffrecords]

Are you sure that is what you want to do? You probably need to commec the dc grounds rather than the transformers themselves. Can you post a schematic?

Cheers

Ian

 

[yekuku]

Hi Ian and thank you for your reply.
I thought i would ask here first before setting my house on fire
Unfortunately  there are no schematics available for this mixer.
I have updated the first post with a picture of what i am thinking of doing.
the original psu is this

 

[JohnRoberts]

Yes, you can safely parallel the two transformer primaries.

Don't overthink connecting the secondaries together. Presumably the 12V supply ground will be bonded to the +/- 15V ground, this will effectively connect the the two secondaries together.

JR

 

[ruffrecords]

From the pic of the original power supply it looks like they bring out the 0V for the 12V winding separately from the 15 - 0 - 15 winding. I suggest you wire the connector exactly the same and just parallel the primaries. Looks like all the dc creation and connection together is done in the mixer.

Cheers

Ian

 

[yekuku]

I connected the secondaries as  shown in the pinout of original psu picture and the mixer  works!
There are a few worn faders but thats not a problem.


many thanks for all the help!