Uploaded November 2015 | Updated September 2026, 1 hour ago
This is an Automatic click mouse circuit. If you need occasionally clickable automatic mouse, use this circuit.
Materials
Normal USB Mouse, 555 timer ic, 300k ohm resistor, 3.9k ohm resistor, 1Mega ohm Variable Resistor,16V 100㎌ Electrolytic capacitor, 1N4007 Diode, DC 5V relay
◎ Cycle time = (300k ohm + 1Mega ohm + 3.9k ohm) * 100㎌ = (300,000 + 1,000,000 + 3,900) * 0.0001 = 130 seconds.
◎ Click time = 3.9k ohm * 100㎌ =3,900 * 0.0001 = 0.4 seconds.
But this circuit cycle time is about 100 seconds. Because the 100㎌ electrolytic capacitor extract from discarded electronics.
This is an Automatic click mouse circuit. If you need occasionally clickable automatic mouse, use this circuit.
Materials
Normal USB Mouse, 555 timer ic, 300k ohm resistor, 3.9k ohm resistor, 1Mega ohm Variable Resistor,16V 100㎌ Electrolytic capacitor, 1N4007 Diode, DC 5V relay
◎ Cycle time = (300k ohm + 1Mega ohm + 3.9k ohm) * 100㎌ = (300,000 + 1,000,000 + 3,900) * 0.0001 = 130 seconds.
◎ Click time = 3.9k ohm * 100㎌ =3,900 * 0.0001 = 0.4 seconds.
But this circuit cycle time is about 100 seconds. Because the 100㎌ electrolytic capacitor extract from discarded electronics.


![12V car bulb connect to 220V directly
This is series capacitor current limit circuit. Widely used in transformerless power supply.
However, it is dangerous because of the high potential difference with the ground.
In this kind of circuit, may damage the bulb by over current flows due to harmonics. (Current : 2 × π × f × C × V [A] ) 12V car bulb connect to 220V directly](https://i.ytimg.com/vi/4HI3JEzjyu8/mqdefault.jpg)







