Simple Digital Theremin Circuit Diagram

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Theremin circuit shown in this schematic diagram applies digital component, so we can call it a digital Theremin. This circuit applies  logic inverter 74C04 or CD4069 hex inverter and CD4046 phase-locked-loop (PLL) IC. The CD4069 logic inverter is functioned as a fixed-frequency oscillator with  frequency around 100kHz. The CD4046 is functioned as a variable frequency [...]

Sferic Signal Simulator Circuit Diagram

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Sferic signal simulator is applied to develop an impulse  signal which models the waveform of a sferic, a radio atmospheric signals developed by a lightning strike. In time domain, the waveform of a sferic signal is a single high amplitude spike. As this pulse is examined in frequency domain, it will demonstrate a wide band [...]

Compressor Speech Processor Circuit Diagram

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The following schematic is an AGC compressor speech processor circuit diagram and can be used in radio circuit communication. This circuit consist of two sections, they are amplification and compression or dipping. The combination of these processing will improve the  SSB communication intelligibility and provide higher average level while avoiding clipping. The 100K pot is [...]

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