<div dir="ltr">Google "pcb planar transformer".<div><br></div><div>Neil</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 19 Jan 2023 at 22:13, cheater cheater via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hah, curious. Never seen that construction!<br>
<br>
On Thu, Jan 19, 2023 at 10:59 PM Mike Bryant <<a href="mailto:mbryant@futurehorizons.com" target="_blank">mbryant@futurehorizons.com</a>> wrote:<br>
><br>
> yes this was very popular in mid-90s, especially for pulse transformers running around a MHz or so.  There were a range of low profile ferrite cores which fitted through holes in the PCB and snapped into the bottom half ferrite under the PCB without any clamps.  Haven't seen them for years though.<br>
><br>
> ________________________________<br>
> From: Synth-diy <<a href="mailto:synth-diy-bounces@synth-diy.org" target="_blank">synth-diy-bounces@synth-diy.org</a>> on behalf of cheater cheater via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a>><br>
><br>
> Has anyone ever tried putting transformers in pcb layers? I guess it<br>
> wouldn't be audio frequencies (due to size), but it might still be<br>
> fun. How about: Audio -> RF -> tiny transformer -> RF -> Audio?<br>
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</blockquote></div>