[sdiy] PCB Transformers

[Phil Macphail]

Sent from my iPhone

> On 19. Jan 2023, at 23:54, cheater cheater via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> On Thu, Jan 19, 2023 at 1:13 PM Roman Sowa <modular at go2.pl> wrote:
>> 
>> My first reaction was "what an idiotic crazy idea with no purpose". But
>> then again, since we get internal layers for free (JLC making 8-layer
>> PCB for $2 now) it's no brainer to leave one or two layers for the
>> heater
> 
> Has anyone ever tried putting transformers in pcb layers? I guess it
> wouldn't be audio frequencies (due to size), but it might still be
> fun. How about: Audio -> RF -> tiny transformer -> RF -> Audio?

I’ve done that countless times. Q is good and you have full control of primary/secondary inductance and coupling-factor. You do need a 4+ layer PCB though.

Phil
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