Automation Circuits

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2x10 LED VU Stereo Meter
Coil Coupled Metal Detector
Digital Fuel Gauge
Loop Antenna Preamplifier Circuit
Android talks to Arduino board
audio Headphones impedance and the SPL
vackar vfo oscillator
serial communication on atmega3216
AC LED drive circuit
Precision polarity switching circuit by conventional elements
Door alarm circuit with a time of recognition NE555



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