many thanks Cor,
the WL1030 project is very interesting, but this is the only one (what I know) using this approach ...
--- In email@example.com, "dx11" wrote:
> Just FYI I know of two loop designs with the OP847, they can be seen at:
> http://wl1030.pa3ang.nl/content/ ( This one is in English. You need to
> register here to get access, but that no other consequences)
> http://dijkjj.home.xs4all.nl/download/bqc-wl1030xx.pdf (This one is in
> Dutch, but with lots of pictures, so you will understand anyway).
> Cor Beijersbergen