A 1964 schematic shows a "capacitance actuated" relay. It's unclear what this was for exactly, but theremins are "capacitance actuated" in that the placement of your hands determines the frequency of the sound. Bob was fond of using the incognito initials "B.S." to hide the fact that R.A. Moog Co. was a one-man company at this time.

Moog drew this 1966 schematic of an oscillator controller by hand. As its name implies, it was used to regulate the frequencies of two or more oscillators, electronic circuits that provided the sine, triangular, pulse, and sawtooth waveforms. It's those waveforms that produce different synthesizer sounds.

About the controller schematic from the previous slide... This is the the 1966 "schemtic" for the oscillator it likely controlled.

This schematic shows a Renfer Capacitance Relay Oscillation Board, which likely led to the creation of 12 capacitance sensing antennas that composer John Cage used to create Variations V.

This is the control plate to a Moog Midget. What the heck is a Moog Midget? You may know it better as the Concertmate MG-1, an analog synth manufactured by Moog and sold by Radio Shack in the early 80s under the Realistic brand name.

This circuit trace layout from 1970 shows the 903A module, basically a noise circuit that provided white and pink noise.

Here's a layout for Moog's Synthesizer 1c, a preconfigured model made in 1968.

In 1968, Moog synthesizer systems gained console (C) and portable (P) designations. Here we have a system layout for the Synthesizer IIIP.

The layout for the Synthesizer 1P. This smaller version of the hulking 1C could be hauled around in its special cabinet.

Here we have the mechanical drawing for the Moog 1130 Percussion Controller, basically an acoustic transducer inside a tom drum that converts the beating of the drum head into a voltage output that can be used to control devices like a Minimoog. Check it.

An elaborate mechanical drawing for the connector cable to goes to the 1130 drum controller.