Frequency Shifters

[Steven Cook]

Hi, this is my first post - thanks to everyone for rekindling my interest
in diy after years of neglect!

I have been intrigued by recent posts concerning frequency shifters.

I built one several years ago based on an old circuit published in ETI
designed to reduce feedback in PA systems. It used a 90 Degree phase shift
network and a 5hz quadrature LFO feeding into two 4quadrant multipliers.

I replaced the fixed LFO with a VCLFO designed by a friend and got some
*interesting* results - it never quite worked properly! I think that the
sine and cosine outputs were clipping the multipliers. (MC1495's)

As far as it went, I got a really nice deep barberpole phasing effect at
slow sweep speeds, and wild ringmod mayhem higher up (with v.strong clock
breakthrough)

Anyway, here's my question: Is it possible to get a downward shift from
this arangement by some simple means such as swapping over a couple of
connections?

ps: Dumb question - How do I get hold of an ASM-1 board?

pps: Even dumber - What is *Electronotes*?

Thanks.