The Jim Patchell Synthesizer D.I.Y. Web Page
was first posted in December of 1998.
Welcome to my do it yourself analog synthesizer
page. It is a bit more than that, but this is the primary
I have been building my own analog synthesizers since 1974. I
started building the circuits that John Simonton (Paia) published in
electronics, and I started right in on trying to improve on them.
first wholly scratch built synth was completed in 1978, and I guess
say I started out big. It was a four voice polyphonic
keyboard scanner was originally implemented using my Polymorphic
Soon, I changed over to using the 6504 micro processor.
I stopped for a while, right around 1990, partly because of the nice digital synthesizers that were available then, and even nicer ones now I have to admit (I love my Nord Modular), and also, because no body seemed to care about analog any longer, let alone, building one yourself. That has all changed now. Interest in analog synths is back up, and now that I have been introduced to the Internet, I have found out there are a lot of other people out there who share my interest.
Things are a lot different now than they were. It seems that finding the custom chips from CEM and SSM is very difficult. And besides, I don't like to design circuits that use parts that may become unobtainium. It costs a lot of money to make a PCB, I don't want to have to throw them away because I can't get parts.
I have started to design a new set of modules. This projects is now pretty much complete. There are still a few things that need to be fleshed out, but it is now a fully working synth. Hopefully, soon, I will be able to do a piece with it.
Plus, I hope to restore some of the old equipment I built a long time ago. I have three synths and a vocoder that are full of spider webs.
Zaca Design is a consulting firm that I work for. Need custom equipment built? Zaca is the place to go.
The love of my life
Well, in case somebody didn't know...I now have a very lovely young lady in my life. Noni Kimbel and myself are getting married on December 30, 2006 at the First Presbyterian Church in Santa Barbara, California. The Christmas party was very important. Because of my work, I was not able to go north to Seattle to celebrate the holidays with my family. The Kimbels were very gracious in sharing the day with me. Little did any of us know that a mere six days latter our two families would be joining. It was on December 31, 2005 that I proposed marriage to Noni.
Secrets of the OTA
Spindle Controller and Spin Stand
My First Synthesizer Project
Old Data Sheets
Synth DIY FAQ web page
Protel PCB Utilities
Polyphonic Synthesizer Boards
Control Voltage Splitter
Roland MT32 firmware mods
Transistor vbe matcher
Seven Segment Decoder Pal
My Home Studio
Voltage Controlled Vocal Filter Experiments
Archives of some old drawings and articles(new)
DIY Digital Synthesizer page
Picture of Various Things
This is a collection of some of my music. I am a Joplin fan, so that is what I tend to do.
Entertainer by Scott Joplin (MP3)
3. Elite Syncopations by Scott Joplin (MP3)
4. The Cascades by Scott Joplin (MP3)
5. The Chrysanthemum by Scott Joplin
6. The Great Crush Collision March by Scott Joplin (MP3)
7. Maple Leaf Rag by Scott Joplin (MP3)
Equipment used (sorry, old recording, no SYNTH DIY in this one):
TX816, Yamaha TX81z, Yamaha FB-01, Kawai K1r, Oberheim XK controller,
SPX90, Teac 40-4, Art 2408, Marantz PMD430. Digital Mastering was
an Echo Layla. Midi Sequencing Atari Mega ST4 running Cubase 2.0.
The Literary Section
Books I have read
Stories I have written
Santa Barbara Atari Computer Enthusiasts (SBACE)
Yep, I own Atari Computers.
Read all about mine and the Atari Club
Anyway, all for now. Hope to hear from you all.