Cgs synth

Chub,

I'd like to take you up on the offer of a set of diodes, but at the very
least let me reimburse you for shipping... if your offer stands, send to

Bob Drake
PO Box 585
Cleveland OH 44107

and I'll shoot you back whatever the postage is, plus a little something
from the parts bin...

best
luigi-bob drake


on 7/28/04 5:40 AM, cgs_synth@yahoogroups.com at cgs_synth@yahoogroups.com
wrote:

>
> Message: 1
> Date: Tue, 27 Jul 2004 13:36:28 -0000
> From: "charlesosthelder" <osthelder@...>
> Subject: Re: Ring modulator questions......
>
> The passive ring modulator sounds different because of the losses
> inherent in the transformers and to a lesser extent, the diodes.
> However, these losses are frequency specific, making the circuit
> very "organic" sounding when compared to an active balanced
> modulator. I liked the sound so much I made a dual RM module.
>
> The signal loss is enough for most to add a make up amp. I went with
> a non-inverting op-amp with a gain of about 3, followed by a buffer.
> This arrangement uses a single TL072.
>
> A "ring" modulator is a nickname for a diode-based balanced
> modulator. Ken's article on his website clearly points out why.
> This is a very old radio circuit (from the 30's) designed to improve
> radiotelephony by using the sidebands of modulated speech. Sideband
> information is of higher frequency, and therefore covers a much more
> narrow band of radio frequencies. An AM signal is over 6KHz wide,
> while a single sideband signal is about 1.5KHz wide. It is also much
> easier to filter the sideband signal.
>
> Any information you'll need is available in the message archives of
> this list. Also, I still have a small cache of germanium diodes and
> I'd be happy to send you a matched quartet.
>
> Chub