[sdiy] Ancient Oscillator

[elmacaco]

Ok, maybe ancient is exaggerating it's age, but it's got diodes in cans!!  I
figured I'd put this oddity on display for kicks.

I got this a while ago,  looks like a DIY bench oscillator, no CV control
and goes way above and below the audio range.

Basically it has Sawtooth and Pulse output, the symmetry control affects
both, Pulse width on the pulse and up ramp to tri to saw on the Saw side.
It has a Sawtooth output, a square output, and an attenuated output.  A
switch selects what waveform goes to the attenuator.

It's fairly frequency stable once set, (I'm sure there's all sorts or crap
going on though) but if you touch the fine freq control (center of the unit)
it warbles, and it does so while you change frequency as well, until you let
go, then it stays put fine.

The symmetry control interacts with pitch a bit on the square wave.

I love the can diodes and transistors.  The diodes are marked 1n1169 / 821
337 HB1 with an M or a W in a circle.

The transistors are Texas Instruments 2N1303 and 2N1302.

I've put a few pictures up of the insides here:

http://www.flickr.com/photos/13469953@N00/

and an Mp3 of it here:

http://s44.yousendit.com/d.aspx?id=08ATO10X389CX0BD5T8W21S3KH

check the toggle switch.

A weird bit of old DIY, it's interesting for me to see this kind of thing.

Enjoy.






----- Original Message -----
From: "Ian Fritz" <ijfritz at earthlink.net>
To: "JH." <jhaible at debitel.net>; <synth-diy at dropmix.xs4all.nl>
Sent: Friday, April 21, 2006 1:08 PM
Subject: Re: Re: [sdiy] Moogey jitter


> At 11:44 AM 4/21/06, JH. wrote:
>
> > > OK, here are the same oscillators beating without the phase inversion.
I
> > > still don't get "warm" from this.
> > >
> > > http://home.earthlink.net/~ijfritz/temp/saws060419.wav
> >
> >Thanks for providing this.
> >
> >Warm I don't know, but it clearly has some pleasant animation.
>
> Animation, yes, but not that pleasant to my ear.  I'm sure we could do
> better with FM from an appropriately filtered noise source, or with an
> appropriate chaotic circuit.
>
>    Ian