68HC11 Microcontroller Circuits

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18W Audio Amplifier
Peak-Reading VU Meters
Audio-Frequency Doubler
Perfboard Hackduino Arduino-compatible circuit
transistors Low power low voltage slow (0.1Hz) oscillator
FM TransmitterCircuit & Project Kits
EM4294 13.56MHz Crypto Analogue Front End Circuit For High Secure RFID Communication
Basics and implementation of capacitive proximity sensing
FM Antenna Amplifier Circuit