[sdiy] transistor filters books?

[Brock Russell]

Dan,

I don't think you are going to find such a book. High order active 
filters did not become practical until Philbrick introduced the 
transistor operational amplifier in the early 50's, and from old 
schematics I've looked at - mostly test equipment - were not common 
place until the introduction of IC op-amps. You are probably finding 
what I have noticed, that most discrete transistor filters are single 
stage high pass or low pass.

Take a look at http://www.philbrickarchive.org/ where you will find 
links to early app-notes including this one from 1966 on filters, 
http://www.analog.com/library/analogdialogue/archives/philbrick/074-078.pdf.

Brock


At 07:45 PM 04/08/2011, dan snazelle wrote:

>I was wondering if anyone knew of a book that covered filter theory 
>before Opamps were everywhere and transistors were more common.
>
>
>The only transistor filter circuits I come across are usually in 
>transistor circuit books and usually they only briefly cover it
>
>
>thanks for any info
>