Here is a collection of various circuits, some with wide application, and some esoteric. Not all the circuits in this section directly relate to theremins,
but are interesting designs which may be useful and entertaining. This collection is intended as a resource for experienced designers and builders, so
little or no emphasis will be placed on construction guidance. Persons without such experience are urged to seek expert advice before attempting
construction. Please read the Legal Notice and Agreement, below, before continuing.

Legal Notice and Agreement

All HTML code, images, and page design, hereafter referred to as "content," contained within this site are the copyrighted property of Arthur Harrison,
and may not, under any circumstances, be cached, retransmitted, copied, or altered without his explicit written permission, in which case, he shall be
acknowledged as the copyright holder and author. Unless specifically stated in a written contract, Arthur Harrison grants no licence to any party for the
use of the content in this site for the manufacture and sale of goods, nor any other commercial utilization. Refer licensing inquiries to: diy@harrisoninstruments.com.
Arthur Harrison assumes no liability for any damages, direct, or consequential, which may arise from the dissemination, application, or misapplication
of the content contained in this site. The user of the information provided in this site assumes all responsibility for any damages, direct or consequential,
which may arise from its use. Arthur Harrison retains the right to alter the content within this site at any time without notice. References to registered
trademarks within this page are provided for informational use only, and are not intended as an endorsement for any service or product. Any such
trademarks are the property of their respective owners.

Safety Notice

Serious injury or death can result from the improper use of high voltage and high power circuits.
Seek professional advice and follow all applicable safety precautions when using electricity.

±4 TO ±18 VOLT, 500 MILLIAMPERE D.C. POWER SUPPLY

DIGITAL NOISE GENERATOR

MUTE CIRCUIT FOR BIG BRIAR ETHERWAVE® THEREMIN 

ROTATING SPROCKET WHEEL LISSAJÓUS GENERATOR

SINGLE-SUPPLY WIEN BRIDGE OSCILLATOR

SINGLE-SUPPLY DIFFERENTIAL-PAIR L-C OSCILLATOR

SQUARE WAVE TO TRIANGLE WAVE CONVERTER

TELEPHONE OFF-HOOK TONE GENERATOR

TELEPHONE OFF-HOOK INDICATOR

ECHO TONE OSCILLATOR

AUDIO SWEEP OSCILLATOR

TWIN-T AUDIO SINE WAVE OSCILLATOR

CONTINUITY TESTER

UNIPOLAR STEPPER MOTOR CONTROL CIRCUIT

BIPOLAR STEPPER MOTOR CONTROL CIRCUIT

TELEPHONE DIAL TONE GENERATOR

LED SEQUENCER

TELEPHONE RINGER

PHONE LINE IN-USE INDICATORS

ULTRASONIC REFLECTANCE DETECTOR

CACOPHONATOR

INCANDESCENT LAMP CYCLER

TRANSPOSABLE CHORD GENERATOR

DELAYED AUDIBLE ALARM

ASTABLE MULTIVIBRATOR FREQUENCY CALCULATOR

NBC CHIMES

DIODE NOISE GENERATOR

FOUR PHASE CLOCK GENERATOR

SYMMETRICAL DIGITAL DIVIDERS

A-440 FREQUENCY STANDARD

SINGLE-CELL LED FLASHER

1000HZ SIGNAL INJECTOR