I built a 4 band parametric based on a design that came
from a company that was around in the 70's early 80's
that I believe I remember as Phoenix Systems? I think
they actually had an article in some mag like Popular
Electronics. It was based on TLO74CN Op amps. I think
it would be excellent to redo with modern chips such as
AD8620's, OPA2132's or 2134's, etc. I think the quad op
amps may be pin compatibe with the 074's. May require
a redesigned board for duals such as 8620's though.
If I can find that article or the schematic (20 moves since then)
I'll scan and post
from a company that was around in the 70's early 80's
that I believe I remember as Phoenix Systems? I think
they actually had an article in some mag like Popular
Electronics. It was based on TLO74CN Op amps. I think
it would be excellent to redo with modern chips such as
AD8620's, OPA2132's or 2134's, etc. I think the quad op
amps may be pin compatibe with the 074's. May require
a redesigned board for duals such as 8620's though.
If I can find that article or the schematic (20 moves since then)
I'll scan and post
I don't know where that article is, but I think it came out
of Popular Electronics or one of those other mags from
the 70's. The examples on this thread are very similar
to what I recal this one being like:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=26115&highlight=
of Popular Electronics or one of those other mags from
the 70's. The examples on this thread are very similar
to what I recal this one being like:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=26115&highlight=
This one is laid out even more similar to what I recall:
http://damien.douxchamps.net/elec/param_eq/
Even same opamp chips in dual version. I'd check pinouts
with those of newer amps listed above and use the
more modern chips.
http://damien.douxchamps.net/elec/param_eq/
Even same opamp chips in dual version. I'd check pinouts
with those of newer amps listed above and use the
more modern chips.
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