Cgs synth

Does anyone have any schematics for ring modulators-either discretes or
ic based?
regards mike

Check my site :

http://yusynth.net/Modular/EN/RINGMOD/

Hi Yves (and everyone else),

I loved your site!
I was reading all your stuff about the Steiner filter last night, but, didn't know you were on the on this list.

I got up this morning and started looking agian.

With regards to the Ring Modulator question,
if you want to make a passive one, the way to do it is to buy as many diodes as you can afford (the proper ones aren't cheap) and sit there with some alligator leads on your multimeter, and test the voltage drop of them all, and write them down, and then chose the 4 that are the closest together in value, preferrably the lowest voltage drop, too, but, having them the same value makes it easier to work with at a later stage. I made the diode ring type one a while ago (used a toothbrush and toothpast "coffin" as a case).

The schematic I used is here: http://users.tpg.com.au/reveng/horn-ring .
Pots suggested are 500K linear, which you'll want on the front panel.

It is from Delton T Horn's book "Music Synthesizers: A manual of Design and Construction". A pretty good book, but, hard to get these days. It's from TAB books, and it's ISBN 0-8306-1565-2.
I left Horn's warning about Ring Modulation on the schematic, I always found it pretty funny. Back in 1984, I suppose there was a lot of ring mod about the place.

Note, that this design doesn't have any Transformers, so you're going to need to put in signals of several volts, and you've going to have a bit of a flat area at the Zero crossing. I used to use it playing the guitar coming out of a Metal Zone against a small white Casio keyboard (mt11). This produces an interesting effect though. For the cost of building one of these types of modulators, it's worth having on hand.

his this rant was of some use to somebody out there :P

-Edward / Loscha

yves usson <yves.usson@...> wrote: Check my site :

http://yusynth.net/Modular/EN/RINGMOD/

--- In cgs_synth@yahoogroups.com, yves usson <yves.usson@i...> wrote:

Hi Mike

No I don't, but anyway the MC1496 is a very common IC and is not
difficult
to source. Should you use transistors to achieve the same you would
have to
very thoroughly match the four transistors involved in the dual
differential
pairs to limit distorsion and bleedthrough, while this matching is
already
done for a low cost in the MC1496 (it cost only 1.2 euros, that is 1.4
US$).

Cheers

Yves

Yves Usson <yves.usson@...> wrote: Hi Mike

No I don't, but anyway the MC1496 is a very common IC and is not
difficult
to source. Should you use transistors to achieve the same you would
have to
very thoroughly match the four transistors involved in the dual
differential
pairs to limit distorsion and bleedthrough, while this matching is
already
done for a low cost in the MC1496 (it cost only 1.2 euros, that is 1.4
US$).

Cheers

Yves

hi Mike

Well, I know this schemo but don't expect to obtain a wll behaved
ringmod
with it. It will be very very good at distorting (but that's may be what
you are actually looking for ?) because of the use of FETs in this mode
and second you will have to work hard at matching the two FETs
if you want the ring modulator to reject the carrier and modulation
signals.

Furthermore, it's not compacter than one designed around a LM1496 and
a TL072, since you need the same number of ICs (6 OPAs that is a TL084
and the TL072)!

Have fun

Cheers

Yves