piezo

piezo

Technical Reference : Keyers

• A HT-powered CW Interface - A keyed piezo beeper, connected to the microphone jack of a HT, appeared feasible as a ready-made MCW generator.
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• AVR Butterfly Keyer - The Atmel AVR Butterfly is a credit card sized board which contains an AVR MEGA169 processor, a six character LCD display, a five way joystick navigation switch, a piezo speaker, a 3 volt lithium battery cell for power and a few other odds and ends.
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