[sdiy] What book is this ladder filter from?

[Steve Lenham]

>> The ADSR is from "Electronic Synthesiser Projects" by
>> M.K. Berry - Babani Press BP81.  I only have an incomplete
>> set of scans of the book (about 40 out of the 60+ pages),
>> so I can't be absolutely certain about the filter.
>
> I deleted the original message, so haven't seen the actual schematic being 
> discussed, but there is a diode ladder filter in "Electronic Music & 
> Creative Tape Recording" by the same author (Babani Press BP51).
>
> BP81 doesn't actually contain a proper VCF circuit, while BP51 only has an 
> AR envelope generator. With both books together you could just about put 
> together a synth as we know it today, with triple-BBD chorus, analogue 
> sequencer...and horribly unstable VCOs!

Replying to my own message...

I found the link in the archives and can confirm that the VCF is definitely 
from BP51, right down to the page numbers. The ADSR is, as has been said, 
from BP81.

 Cheers,

 Steve L.