Hello,
Looking to build a dual mono power amplifier that requires a 600va dual +/-50v PSU.
What is the difference between using two 300va toroidal transformers with dual 35v secondaries to two PSU boards vs using one 600va toroidal transformer with quad 35v secondaries to two PSU boards?
Does it make a difference?
Or do you really need two separate toroidal transformers to be true dual mono?
Thank you,
David.
Looking to build a dual mono power amplifier that requires a 600va dual +/-50v PSU.
What is the difference between using two 300va toroidal transformers with dual 35v secondaries to two PSU boards vs using one 600va toroidal transformer with quad 35v secondaries to two PSU boards?
Does it make a difference?
Or do you really need two separate toroidal transformers to be true dual mono?
Thank you,
David.
Interesting question, I would also like to know this! On the other hand, where do you find these transformers? I didn't have much luck with a quick search.
With the risk of asking a stupid question, could you elaborate on how there would be crosstalk from such a transformer? It's not like you have two signals there that should be kept separate.
Potential ground loop issues would be the same as with a single transformer? If that's the case, that would eliminate one of the main benefits of dual mono. I want to emphasize that I'm not experienced at this and am not trying to argue a point, just interested in the subject.
There's magnetic coupling between the windings, and of course transformers don't have perfect regulation, so a current draw on one channel is going to modulate the supply of the other channel.
As kramtweeter said, there can be magnetic coupling between windings and current draw from one channel can modulate the supply of the other channel. Oversizing the transformer can mitigate the current hogging that may occur.
That being said, in my experience it works well. I used an oversized 800VA Toroidy with quad secondaries and dual mono capacitance multiplier supplies in my test mule amplifier, called the NPXP. Using a single transformer helps with weight distribution as well since I can locate it near the center of the chassis. This is something to ponder especially if you are moving the amplifier quite a bit as I do for get togethers and such.
The other negative with quad secondaries is that they are usually not an in stock item. Since Toroidy accepts orders from fearless amplifier builders, they can accommodate “custom“ single orders. Many other transformer companies cannot do so.
Best,
Anand.
That being said, in my experience it works well. I used an oversized 800VA Toroidy with quad secondaries and dual mono capacitance multiplier supplies in my test mule amplifier, called the NPXP. Using a single transformer helps with weight distribution as well since I can locate it near the center of the chassis. This is something to ponder especially if you are moving the amplifier quite a bit as I do for get togethers and such.
The other negative with quad secondaries is that they are usually not an in stock item. Since Toroidy accepts orders from fearless amplifier builders, they can accommodate “custom“ single orders. Many other transformer companies cannot do so.
Best,
Anand.