This circuit can use a pendulum sensor. We found this configuration in a 1994 publication. The components used are common and the timing is given by the capacitor C1 which can be changed.
We found this circuit in an old Italian publication, but it can be fitted with BC558 transistors if the...
This LED indicator circuit uses an LM339 comparator. The circuit was found in the January 1995...
One touch of the sensor and the LEDs run. When you take your finger off the sensor, only one will...