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IC 2 tones Siren
4 Watt Amplifier with preamplifier
Transceiver for 20 m band
2 Transistor Mini FM Transmitter
Bus masters diagram
AD Design
adding audio to arduino projects
3 band equalizer circuit
Frequency Doubler
Zero Crossing Detector (ZCD): Comparator circuit using 741 op amp
Simple NE555 IC Testing Circuit
Optical Pulse Generator
Lighting controller circuit
Photoelectric control circuit lullaby