[sdiy] TRYING TO RECREATE/CONFIGURE THE psych tone for modern use.

[Tom Bugs]

Heya Dan,

Can't be of any direct help right now, but....
...thanks for that link!
- there are some great articles available if you trawl through the 
www.swtpc.com site (SWTPC standing for Southwest Technical Products 
Corporation *not* /South West Tractor Pullers Club!!/)//
I found:
-a valve theremin circuit artilce 
(http://www.swtpc.com/mholley/PopularElectronics/Apr1955/PE_Apr1955.htm)
- reverb for your car!! 
(http://www.swtpc.com/mholley/PopularElectronics/Feb1966/PE_Feb1966.htm)
- Don Lancaster's Musette Colour Organ 
(http://www.swtpc.com/mholley/PopularElectronics/Jul1966/PE_Jul1966.htm)
- more reverbs!
- something called 'The Amazing People Detector' !!!

Basically, there's loads of interesting articles archived there. Ok, 
there's some quite old technology going on in most cases, but definitely 
worth a trawl.

All best,
Tom

Dan Snazelle wrote:
> THE PSYCH TONE....
>
> a psuedo random tone gen capable of 1728 different sequences.
> I have really wanted to build this or something like it for a long time. at least the tone computer part and the pause gate.
>
>
>
>
> to start with, here is a link to the original schematics:
>
> http://www.swtpc.com/mholley/PopularElectronics/Feb1971/PE_Feb1971.htm
>
>
> you can also find an updated version in the TTL cookbook under: A MUSIC COMPOSER (pages 282-284 in my edition)
>
> in the new version he replaces the old flip flops with: 7474's (three of em) they are set/reset types and i am wondering if i can replace them with 4013's?? or maybe even 4015's???
>
> he also uses an 8 input Nand Gate called a 7430
> and a 1 of 8 decoder called a 7442
> and a 7486
>
> and a 555 clock (easy)
>
>
> and some rotary switches.
>
> I think if i could figure out how to replace those old fashioned flip flops, i could get the sequence gen and the pause selector working. But then there is the question of how to HOOK up the result of the 1 of 8 decoder to a tone generator. in the old version, he uses a complicated series of transistors (including UJT's) to create a sound based on 3 inputs being high or low.
>
>
> in the new one, the 7442 has 8 outputs which are to a "note generator" and it says LOW=note
> but i dont know how i could implement that with either CV (could i use an 8 step R2r? but that would only get me 8 different notes..right?) or somehow into a cmos based oscillator...
>
>
>
> getting sound out of it is a major point of confusion for me. probrably since the old design is, well, so old!
>
> i have heard very mixed things about this but remember, i love all the stuff being built on the LUNETTA thread (on electro-music.com) so this would probrably be great as a CV generator front end.
>
>
> any and all help appreciated.
>
> really trying mainly to figure out what kinds of flip flops to use and then how to convert the bits and pauses into sound or CV.
>
> thanks so much
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