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R. Foote
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John L Rice
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 Posted:
Fri Nov 26, 2004 6:19 pm Post subject:
Re: My new synth is finished! |
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Beautiful work! What are the details? And it looks like you have two
models? One in the Tascam rack and a smaller self contained one? Are the
circuits/boards your own design or are they kits that you put into your own
hardware? I think I saw a Curtis chip on one board, do you have a good
source for those?
Best of luck!
John L Rice
Drummer@ImJohn.com
"R. Foote" <footnote1@excite.com> wrote in message
news:d1ec46ec.0411260820.4718b7af@posting.google.com...
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dt king
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| Posted:
Sat Nov 27, 2004 12:15 am Post subject:
Re: My new synth is finished! |
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How'd she sound?
"R. Foote" <footnote1@excite.com> wrote in message
news:d1ec46ec.0411260820.4718b7af@posting.google.com...
| Quote: | Here are some links to pics.
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R. Foote
Guest
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| Posted:
Sat Nov 27, 2004 6:14 am Post subject:
Re: My new synth is finished! |
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"John L Rice" <Drummer@ImJohn.com> wrote in message news:<10qer9gmodk1h9f@corp.supernews.com>...
| Quote: | Beautiful work! What are the details? And it looks like you have two
models? One in the Tascam rack and a smaller self contained one? Are the
circuits/boards your own design or are they kits that you put into your own
hardware? I think I saw a Curtis chip on one board, do you have a good
source for those?
Best of luck!
John L Rice
Drummer@ImJohn.com
|
Thanks!
Here are the modules:
The top box:
3- VCO
3- VCF
The middle box:
3- ADSR
3- LFO
2- VCA
1- Noise (White, Pink and LF)
2- 1X3 to 1X6 Normalled Mults
2- 4X1 Audio / CV mixer
The bottom box:
2- Sample / Hold
2- Lag Processor
4- Buffered attenuator
2- +5 vdc Bias source
2- -5 vdc Bias source
2- Level shifters (converts +/- 5v signals to 0-5v signals)
1- 4X2 Audio mixer with headphone out on front panel and 2 balanced
XLR outs on the rear.
I designed all the PCB's and had most made to order. I re-designed the
VCO's, the Sample/Holds, but designed pretty much everything else.
The smaller box pic is the top box you see in the rack..
Here are a couple of PCB pics:
http://img.photobucket.com/albums/v295/rafoote/Analog%20Synth/VCO_Small.jpg
http://img.photobucket.com/albums/v295/rafoote/Analog%20Synth/Noise_Small.jpg
There are Curtis chips and plain monolithic stuff. A few transistors
to boot.
Back in the late '70s, Doug Curtis helped me with design specifics on
the VCOs and VCAs.
Best |
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Ethan Winer
Guest
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| Posted:
Sat Nov 27, 2004 6:07 pm Post subject:
Re: My new synth is finished! |
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RF,
| Quote: | Here are some links to pics.
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Awesome. Congratulations. I know that must have been a *huge* amount of
work.
--Ethan |
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R. Foote
Guest
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| Posted:
Sat Nov 27, 2004 6:07 pm Post subject:
Re: My new synth is finished! |
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"dt king" <pretendaddress@thoughtdog.com> wrote in message news:<IfNpd.101561$5K2.62836@attbi_s03>...
Sounds good. A lot better than the old version. Here I used hi-quality
pots, jacks and switches. Polypropylene caps for all the films,
Panasonic FC for all electrolytics. 1% metal film resistors also. It
is DC coupled throughout except the final mixer, which has a freq
response of 10hz- 100khz.
The old version used Alpha pots, cheap open frame phone jacks and
whatever caps and resistors my local surplus dealer had. I was a lot
more careful in the electronic design on the newer one too.
I bought the Curtis chips in 1978, but I would like to get more.
Haven't searched around for a source yet... Any suggestions? |
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ScotFraser
Guest
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| Posted:
Sat Nov 27, 2004 6:07 pm Post subject:
Re: My new synth is finished! |
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You should post this to the various DIY analog synth sites as well. Looks
great, super clean work, congrats.
Scott Fraser |
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John L Rice
Guest
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| Posted:
Sat Nov 27, 2004 6:07 pm Post subject:
Re: My new synth is finished! |
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I haven't purchased from them but this place seems to have a large stock of
Curtis chips, in addition to making some really nice looking modular synths
:
http://www.synthtech.com/cems.html
John L Rice
Drummer@ImJohn.com
"R. Foote" <footnote1@excite.com> wrote in message
news:d1ec46ec.0411270738.1f558c2e@posting.google.com...
| Quote: | "dt king" <pretendaddress@thoughtdog.com> wrote in message
news:<IfNpd.101561$5K2.62836@attbi_s03>...
How'd she sound?
Sounds good. A lot better than the old version. Here I used hi-quality
pots, jacks and switches. Polypropylene caps for all the films,
Panasonic FC for all electrolytics. 1% metal film resistors also. It
is DC coupled throughout except the final mixer, which has a freq
response of 10hz- 100khz.
The old version used Alpha pots, cheap open frame phone jacks and
whatever caps and resistors my local surplus dealer had. I was a lot
more careful in the electronic design on the newer one too.
I bought the Curtis chips in 1978, but I would like to get more.
Haven't searched around for a source yet... Any suggestions? |
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