Add DC Offset to Audio Signal After Amplifier Output

pnielsen said:

Thanks for pointing that out. Your figures are what I am seeing on the lab power supply read out. The present heatsink is probably too small, but I can fit a larger one.

The 22R resistor is 10W ceramic but it gets too hot to touch. Given that the current is less than one watt, is there an explanation for this?

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pnielsen said:

I was just trying to keep things small scale. Yes, I think you are right. Bigger heatsink and an aluminum clad load compensating resistor in series with the low resistance coils.

But it is always good to learn a few other techniques which I may try just for fun. I have seen a transformer used to add DC offset to function generator output. There is a Keysight publication that describes it.

https://www.keysight.com/au/en/assets/7018-06324/white-papers/5992-3310.pdf

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pnielsen said:

Audio frequency modulation of a steady state, unidirectional magnetic field.

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