Arduino Projects and Circuits

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Digital Levels Scope Displays 2 Logic Signals On 1 Scope
Cable Tester Circuit
QRP HF LINEAR AMPLIFIER Circuit
the design of the gas detector of LPC221
High-stability oscillators (non-crystal)
power failure alarm circuit
Canary chirp generator
Door bell circuit using NE555
EUA2032 Low EMI Ultra-Low Distortion 2.5-W Mono Filterless Class-D Audio Power Amplifier
smart phone light circuit diagram
FM Booster~Active FM Antenna Amplifier
Antenna Circuits / Schematics
Stand-alone Arduino
Cool gradually dimming light switches



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