Free Simple Circuit Diagram
This is a power on circuit that works temporarily only when the power is turned on, this LED illuminates for a few seconds, then turns off again. This design is eco-friendly since it consumes only a little power at the beginning of the power connection. Here is the schematic diagram of the circuit: The circuit uses the 47uF capacitor that […]
Read moreThis is aquiz bell/alarm circuit. This circuit indicate “fastest finger first”. This circuit has one bulb for Quiz master and one for each contestant. The bulb will illuminate when a button is pressed. the cathode of the 9v1 zener sees approx mid-rail voltage. The Quiz Master bulb is also illuminated. Here is the circuit: There is no other bulbs can […]
Read moreUsing circuit below, we can animate the bike turning signal using LED. The bike turning signal will blink from the right side (D1) to the left side (D5) in a bar style. To build a complete left and right turning signal, you must build two units of this circuit, and arrange the LEDs so the other circuit will blink to […]
Read moreBelow is the simplest circuit you can get. We can use any NPN. Connect the 220 ohm resistor, LED and transistor as shown in the figure below. Touch the top point with two fingers of one hand and the lower point with fingers of the other hand nad squeeze. When you squeeze harder, the LED will turn on brighter. We […]
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