[sdiy] A book about analogue synthesizer circuits?

[Richard Wentk]

I'd recommend getting hold of an old copy of Hal Chamberlin's Musical 
Applications of Microprocessors. It's no longer in print and was last 
updated in the mid-80s, but there's a lot of basic and very useful 
information about analogue synth circuits, and also details of the basics 
of digital filters.

It doesn't go into the degree-level maths you need to know to design 
filters and DSPs, so it's not a complete do-it-all guide. But it's an 
excellent introduction to the subject, is quite fun to read too, and has 
some interesting design ideas.

Amazon has a list of used copies starting from less than $30. (And one 
person treating it as a collectible and asking for around $90!)

Richard