Category Archives: Technology

Looking for a Theremin kit? Want to build a Theremin? Eager for a Theremin schematic? Check these articles and make your Theremin.

Of the Theremin Making

nectron Transistor Theremin Chassis

Giorgio Necordi’s short report about the making of his transistor theremin. After a long wait it’s time to come out and unveil the instrument based on my long time experiments with theremins. This is the theremin you can hear in the “theremin samples” section of the thereminvox.com library The entire instrument was completed during 2003 […]

Lucy Rosen’s 1940’s Theremin Notebook

Lucie Rosen Custom Theremin

The document below was found by John Snyder during his Caramoor research many years ago. Lucy Rosen owned that country estate, and maintained two custom theremins made for her by Professor Theremin. The typewritten photocopies John rescued were apparently originally transcribed from shorthand notes. The document contains numerous grammatical errors. I edited here and there […]

RCA Theremin Service Notes

The RCA Victor Theremin

Preface The RCA Theremin is an electrical musical instrument played by the free movement of the hands in space. The actual production of sound is accomplished by means of a loudspeaker which must be connected to the RCA Theremin. The loudspeaker may be located close to the Theremin or at any convenient distance as required. […]

Of the Theremin and Futurist Stringed Instrument Making

Theremin: Diagram of Virtual Capacitor.

In this article, Giorgio Necordi examines the technology behind the Theremin and outlines the differences between tubes and transistor technology. Then he describes his project for a new transistor Theremin. Introduction The date of birth of the first electronic instrument depends on that of the invention of the thermionic valve or tube (the first exquisitely […]

The RCA theremin – 2 – The Pitch Control System

The RCA Victor Theremin

The construction and operation of the RCA theremin pitch control circuit. This installment deals with the construction and operation of the RCA theremin pitch control circuit. The heart of the system is a large “pitch control resonant coil” (PCRC). The PCRC is the tall coil mounted the left side seen when looking into the back […]

The RCA Theremin – 1

The RCA Victor Theremin

Part 1 of a technical essay about the RCA theremin by Reid Welch. This is the first of several installments about the RCA theremin. Our goal is to promulgate enough data to enable the skilled amateur to build an RCA equivalent, and to make the circuit less mysterious to the non-technical person. Discussion and corrections […]

More Original RCA Data

The RCA Victor Theremin

RCA theremin technical notes written by Reid Welch. The RCA Pitch Resonant Coil Consists of more than a thousand turns of approximately 38 ga. ( B&S gauge) SSC enameled wire wound on a 12″ tall by a 2 15/16″ diameter, 1/16″-wall phenolic impregnated fiber tube. Winding length- 10 3/4″ DCR 445 ohms Z at 1kHz […]