Here are some links to pics.


http://img.photobucket.com/albums/v2...nth/Side01.jpg


http://img.photobucket.com/albums/v2...th/Front01.jpg

http://img.photobucket.com/albums/v2...SynthSmall.jpg

http://img.photobucket.com/albums/v2...h/Inside02.jpg

http://img.photobucket.com/albums/v2...h/Inside01.jpg

http://img.photobucket.com/albums/v2.../VCO_Small.jpg

http://img.photobucket.com/albums/v2...oise_Small.jpg

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


"R. Foote" wrote in message
om...
Here are some links to pics.


http://img.photobucket.com/albums/v2...nth/Side01.jpg


http://img.photobucket.com/albums/v2...th/Front01.jpg


http://img.photobucket.com/albums/v2...SynthSmall.jpg

http://img.photobucket.com/albums/v2...h/Inside02.jpg

http://img.photobucket.com/albums/v2...h/Inside01.jpg


http://img.photobucket.com/albums/v2.../VCO_Small.jpg


http://img.photobucket.com/albums/v2...oise_Small.jpg

How'd she sound?

"R. Foote" wrote in message
om...
Here are some links to pics.

"John L Rice" wrote in message ...
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


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/v2.../VCO_Small.jpg

http://img.photobucket.com/albums/v2...oise_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

RF,

Here are some links to pics.

Awesome. Congratulations. I know that must have been a *huge* amount of
work.

--Ethan

"dt king" 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?

You should post this to the various DIY analog synth sites as well. Looks
great, super clean work, congrats.

Scott Fraser

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


"R. Foote" wrote in message
om...
"dt king" 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?