Theremin Circuits Scratchpad
#theremin
#oscillator
#audio synthesis
#frequency modulation
#capacitive sensing
#music
#instrument
#electronics
#DIY
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LC CHECKER
The circuit operates on the principle of the grid-dip or absorption effect, which takes place when a parallel resonant circuit is coupled to an oscillator operating at the same frequency. Transistor Q1 functions within a standard Colpitts oscillator circuit, maintaining...
Oscillator operates from one cell
The circuit is powered by a single 1.35 V mercury cell and provides a 1 V square-wave output. The crystal acts as a tuned circuit between transistors Q1 and Q2, which are connected in a common-emitter configuration. Positive feedback is...
Code practice oscillator
The circuit comprises a basic oscillator (above the dashed line) and an automatic keyer (below the dashed line). The unit can be utilized with either a straight hand key or a paddle key for automatic operation.
The described circuit integrates two...
simple electronic organ
This electronic organ is simple to construct and can provide hours of enjoyment, particularly for children. The circuit is fundamentally an emitter-coupled oscillator consisting of transistors T2 and T3. A square wave voltage can be sampled from the collector of...
Metal detector circuit diagram 3
The metal detector consists of a probe oscillator, a reference oscillator, an audio amplifier, and various other components, as illustrated in the schematic. The probe oscillator is made up of transistors V1 and V2, a detection coil L1, a capacitor...
Little dipper
The circuit consists of two fundamental components: the oscillator and the detector. The oscillator employs a Field Effect Transistor (FET) in a Colpitts configuration. The energy circulating within the oscillator's tank is coupled through capacitor C4 to the detector circuit,...
theremin
This was a quick experimental prototype based on a simple design by Doug Forbes, which utilizes common vacuum tubes. In its simplest form, a theremin operates by mixing two high-frequency oscillators—one fixed and the other tuned by the capacitance of...
Optical Theremin
A Theremin typically operates by detecting hand proximity through the capacitive coupling method. The Theremin circuit illustrated in the schematic diagram below employs a different technique to control pitch. In this optical Theremin, the oscillator of the tone generator has...
Single Chip Theremin Circuit
This schematic diagram illustrates a single-chip Theremin circuit. A Theremin is an electronic musical instrument that detects hand movements to control tones and frequency. The circuit employs two separate Colpitts LC oscillators to generate a beat frequency. The frequencies of...