A forum is not the best place for such a knowledge collection. After a while these information are lost because its almost impossible to dig them out. That's also the reason why the same topics are discussed over and over again.

The right place would be a Wiki. Unfortunately neither Milovana or ...

Thank you mantrid, I understand better how to compute the impedance of the transformer.

In my case, I will stay with the 10Ω serial resistor but with a heatsink and I will mount it with thermal paste on the metal frame.

I have also plane to open a new topic to centralize the different information ...

The purpose of the parallel resistor is to make the device act more like a current controlled device, as opposed to a voltage controlled device. I have not tested this but reportedly this improves the sensations.


Thanks, but I didn't understand that.

For me the goal is to have a load for the ...

Is putting a resistor parallel to the transformer useful in my case?

The DC resistance at the primary side is only 1Ω. As I understand it, putting a parallel resistor of 22Ω or more will result of an equivalent resistor just a little less than 1Ω, out of the 4Ω - 8Ω scope of the amplifier. Right?

Yes, there is no parallel resistor.
Only the high pass filter and a TVS diode.

https://milovana.com/forum/download/file.php?id=26263

Thanks for the suggestion. That's what I was going to do too, buy resistors with heatsink and put thermal paste.
But I wanted to make sure I understood where the ...

Are you sure those are 10W resistors? They look like they're about 17mm long, an appropriate length for a 3W resistor?



Good point!
They are 5W resistors. I don't know why, I was convinced that I bought 10W.

https://www.digikey.fr/fr/products/detail/te-connectivity-passive-product/ROX5SSJ10R ...

Hello!

Thanks for all the info you share here!
I made my own stereo e-stim box based the parts list proposed by mantrid .

It worked very well... until the third session when the 10 ohm 10W ( Edit: 5W in fact) resistors started to burn out!

I'm not sure I understood mantrid's calculations ...