Found in an Electronic Design, this small power source uses a battery as a voltage reference, consuming little of its current. The source is shunt type.
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...