Synth'y for the Devil

[Freq Band]

I've started a modular CV synth.
From various on-line schemos.
http://www.musicfromouterspace.com/analogsynth/August2003VCO.html
http://www.musicfromouterspace.com/analogsynth/signaltogate.html
All point-to-point wiring.
Wicked-old but unused surplus resistors.....ha :twisted:
Here are some pics, but scroll down, for I have a question for you guys...
VCO:
http://i5.photobucket.com/albums/y177/Midiot/DSCN1799.jpg
Signal to Gate:
http://i5.photobucket.com/albums/y177/Midiot/dscn1805.jpg
(southside view):
http://i5.photobucket.com/albums/y177/Midiot/dscn1806.jpg
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Here is the idea I'm trying to flesh out:

I collect IC's from scrapped (surplus) circuit boards from a local shop here in Los Angeles.
...Only if they're socket-ed, and seem in good shape. There's not a lot of audio based scrap. These days, all that pro "analog video" gear is being trashed by the studios to make room for the new high def stuff.
So I find lots of video op-amps that may or may not be ok with audio/synth gear.
I download datasheets for what I find.

Anyway, I came across this AD8036 clamping op-amp. I think there are some uses for it synth-wise. (Remember, I ain't no "injeneer".)
http://www.analog.com/UploadedFiles/Data_Sheets/148382251AD8036_8037.pdf#search=%22ad8036%22

Look on page 20, there is a schemo for an Amplitude Modulator.
A carrier signal, and a modulation signal are fed in the amp's inputs.
.........and the results vary.....I know because I built that circuit last night.
I used a function generator @ 2v pp, square wave for the carrier.
Sent a modulation signal in the other input....from my Novation A-station synth.
What I got out depended on several things....the amplitude of the carrier, the frequency of the carrier, and the the offset of "Vh" (pin 8 to a pot wiper(2) , +5v and -5va to pot's 1 & 3).
Sound?.....at times like ring-mod, other times like noise strapped to the modulator. Interesting areas: carrier frequency turned way down gave an on-off effect. My funct generator has a sweep with width and speed, that was interesting.
I did hear a small popping with the clamping action with a square wave carrier, but I tried a sine wave, and that remedied that, but possibly it needs a buffer on the output. (or is the amp itself already a buffer?) The datasheet says "0.5v offset at Vh" and I may not have been able to dial that in precisely with a standard 10k pot......maybe part of the popping source.

Last night was just a quick impatient test for me. My first synth is not yet done, but I have several other commercial synths to use as modulators (SE1x).

(I posted this idea at ElectroMusic forum (diy synth) as well. I especially want to hear what you guys think about uses for this chip...?)

=FB=

 

[analag]

Don't you know most of these guys are afraid of anything beyond the simple ABC stuff. Ha ha ha ha.....

analag

 

[Kev]

what do you mean ?

as soon as that post was made I distributed it to a few of my HARD Synth mates and as far as I know they were arguing over whether they had seen it before and the pros and cons over what they already had.

you say people pick on you but
was that called for ???

if it is just a joke then coool I'll laugh too and I'll shut up

 

[analag]

[quote author="Kev"]if it is just a joke then coool I'll laugh too and I'll shut up[/quote]

I kick started the thread....with a provocative joke. It's good stuff and it shouldn't be left to sink to the bottom of the page. So much junk getting all the hits, man. Feel me?

analag

 

[Kev]

that's cool
yes it is good stuff

those two guys I spoke of are still bumbling around a bread board
they love their CV stuff

I'm not hard core enough, even though I do love Hard Synths, I am a bit of a preset wimp ... just too many other things to do so I leave it for the experts and hard core patch programmers.

 

[Freq Band]

[quote author="mediatechnology"]Freq Band;

I've got the 1K 3500 ppm tempcos, and for the 3046s, THAT300s if you need them.

Wayne[/quote]

Thanks, I appreciate that.
Although I was able to find some ...explained here :
http://www.groupdiy.com/index.php?topic=18018
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Kev,
let me know if you hear anything from your friends...Thx.

=FB=

 

[beatpoet]

How ugly would that chip sound in a voltage controlled gate/compressor/sustainer? Hopefully pretty ugly.

Clamp rectified detector?

Clamp rectified distortion?

 

[Freq Band]

I think there are many ideas...I may have been too general, and need to focus in, a bit.

Perhaps a good place to (re)start is -- what applications (any) need to use a Clamp-amp ? And what is special about it, that cannot be done with other signal-switching chips ?....is it just the adjustable threshhold?
Perhaps I will re-read the datasheet....again. (read bottom):razz:

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