As microcontroller this PCB uses the MH ET LIVE ESP32MiniKit. The PCB is designed to allow the use of one mini amplifier module (PAM8403) and/or a bluetooth transmitter module (kcx_bt_emitter). There ...
Simple ultrasonic antispy voice recording jammer based on ATTINY13 / ATTINY85 with resistor ladder based DAC and 2 transistors (or PAM8403 module) driving piezo ultrasonic transducers. It prevents ...
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