Oscillator Circuits

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Portable Nicad Charger
Relay Output Proximity Sensor
Holiday Light Sequencer Circuit
The 555 Door Alarm
Fire Fighting Robot (AT89S52)
200mA per Hour 12V NiCAD Battery Charger circuit
Automation of Lamp Relay Controlled with RF
emergency lamp circuit problem
Homemade Metal Detector Kit
Four-way operation of the reverse brake circuit