[sdiy] What book is this ladder filter from?

[Tim Daugard]

> I've seen the ladder filter before - I think it might be Formant? - I t looks like the

Not Formant - still looking. I would have guessed Penfold also, but I don't think it's
Penfold.

> BTW I have a similar diode half ladder filter on my website (Fred's online edition)
> http://home.earthlink.net/~synthfred/h_fal121.htm
>  - saves parts at the expense of an unbalanced ladder - less control voltage
suppression.
> I filter for the control voltage - works good enough for my use.

. . . and that schematic (along with other research) was what inspired my filter version.


Tim