Inventions make our world move. We all need them, we all use them, they are the little engine that helps the human race to advance. The hum...

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This circuit uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR coul...

This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores), or for anyt...

From our childhood days, we have studied that nothing in this planet travels faster than light. It has been defined as the ultimate speed i...

Description: As shown by the gas sensor alarm QM, buck rectifier and regulator circuits, integrated circuits KD28, speaker Y and so on. Q...

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