Comments on: New discoveries from the Bob Moog Foundation Archives: more schematics, more history

By: N.C.L.

N.C.L. — Sun, 22 Mar 2015 00:39:08 +0000

1st schematic looks like the diagram fro the heater and A/C circuits, on my 1996 Ford Taurus Wagon, which failed because the heater-A/C fan motor control circuit overloaded with aging, heated up, melted the plastic container, would not let the tiny coil/magnetic points release, causing my fan to run when the key/motor is shut off. As I usually ran the fan on low speed, I did not hear it running and it discharged the battery, which I discovered at 7am the next morning which was about 20 below zero Fahrenheit, which in turn caused me to say “Oh DARN”………..
Luckily the Ford dealer had a replacement part , being that old (1996), I assumed I was lucky to have an older car that had this problem, and there were more people having the same problem as the parts man told me “Yeah, we sell a lot of those relay switches”

By: Fedge

Fedge — Tue, 17 Mar 2015 19:05:18 +0000

Jerry, because you can? 😀

By: Bob Moog’s Beautifully Intricate Drawings of Synth Circuits – Wired | Gerbong Artwork

Tue, 17 Mar 2015 18:28:27 +0000

[…] the man and the history of electronic music, The Bob Moog Foundation released a brand-new batch of 15 original instrument schematics dating spine to 1964. These technical drawing s of boards and circuits (several of which were done […]

By: Jerry B. Williams

Jerry B. Williams — Mon, 16 Mar 2015 16:10:09 +0000

Being both a “Senior Mechanical Designer” and a “Senior PCB Designer”, I can have a certain appreciation for the amount of effort it took to develop all of this equipment using strictly “hand-drawn” manual methods. I am also old enough to know what it took because I was doing similar types of work back in the 1970’s before computers took over the world. I also have “hand-designed” Printed Circuit Boards just like Bob Moog has done in these examples. It is NOT easy!!!

Looking at the schematics and the board layouts, almost makes me want to re-create these old designs using today’s new technologies. But, for what purpose?

By: Dave Jones

Dave Jones — Sat, 14 Mar 2015 19:04:37 +0000

Actually it looks like a random voltage generator. The two transistors in the upper left make a noise generator. The trigger input triggers a sample and hold, which samples the noise. The resulting sampled voltage is buffered and sent out as a control voltage.

By: Jack Ripper

Jack Ripper — Fri, 13 Mar 2015 02:10:58 +0000

Great!

By: duncan

duncan — Wed, 11 Mar 2015 23:41:22 +0000

following on from pete wagner there, I think schematic #7 is a sample&hold device…. I see a noise source & a triggered FET…

By: Mark Barton

Mark Barton — Wed, 11 Mar 2015 16:53:22 +0000

Schematic #7 “Random Generator” is not a noise source. It is a sample-and-hold random step generator. It has an internal fixed frequency sawtooth which is sampled when a positive edge is presented to the trigger input.

By: Peter Wagner

Peter Wagner — Wed, 11 Mar 2015 09:59:26 +0000

Fascinating and really valuable. I think item 7, the Random Generator, is not so much a sound source as a random trigger delay. I wonder what this would have been used for?