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Single-Chip Voice Record/Playback Devices 2- to 16-Minute Durations
Reflective infrared corridor lighting controller circuit
2Y-△ connection two-speed motor contactor control circuit three
Rain alarm circuit diagram that doubles as doorbell
Change the 78XX series fixed voltage circuit to a high-precision adjustable voltage
Phototransistor adopts transformer-coupled modulated optical signal amplification circuit
Doppler effect and light dual control automatic door socket circuit (RD627)
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