theremin controller
#theremin
#oscillator
#audio synthesis
#frequency control
#capacitive sensing
#music instrument
#sound generation
#analog circuit
#electronic music
#pitch control
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Minimum Theremin Schematic
Two identical integrated circuits, U1 and U2, known as "hex inverters," are utilized for the primary functions of the theremin. These are CMOS (Complementary Symmetry Metal Oxide Semiconductor) devices commonly employed in digital circuits to perform a logic function referred...
Oscillator without a crystal
Is it possible to build an oscillator (VCO or not) without using a crystal? I built a Pixie II with a borrowed crystal, which I have since returned, and now I am inquiring about the feasibility of constructing an oscillator...
Safety flare
When the switch SI is activated, power is supplied to an oscillator that consists of Q1, R1, C1, L1, and L2. Coil L1 serves as the primary winding of transformer T1, while L2 functions as the feedback winding. As Q1...
Minimal metal detector
This circuit is an oscillator with LI being a 4-inch diameter coil consisting of 35 turns of #26 magnet wire. Metal in proximity to LI will cause the oscillator to shift frequency. An AM transistor radio is used to detect...
Auto Flash Alarm - Staircase_Control
The circuit comprises a low-frequency oscillator, an electronic switch circuit, a control circuit, a photoelectric display circuit, and a music alarm circuit. The low-frequency oscillator is constructed using an integrated circuit (IC) with internal NAND gates and external resistor-capacitor (RC)...
Metal detector circuit diagram 8
The metal detector circuit consists of a probe oscillator, a PLL (phase-locked loop) circuit, and an audio alarm circuit. The probe oscillator includes a detection coil (L), transistor (V1), and several resistors (R1 to R3) and capacitors (C1 to C5)....
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...
VHF/UHF TV Modulator
A simple oscillator generates a frequency in the VHF or UHF range. This oscillator is modulated with a video signal, and the resulting modulated carrier wave is transmitted to the TV set's aerial input through a cable. The final step...
Corrector circuit diagram of an analog circuit
A XICOR X9241 POT IC module can be utilized to modify the four digital analog circuits, as depicted in the schematic.
The XICOR X9241 is a digital potentiometer integrated circuit designed for precise adjustment of analog signal levels in various electronic...