Found in an Elektor from the 90s, this circuit can be powered directly by the power grid. The circuit uses a rectifying bridge that can be replaced by 4 common diodes.
A TTL NAND trigger is the basis of this oscillator which, with the indicated components, can...
This circuit can monitor direct or alternating currents. Resistor R1 is calculated so that the...
Found in a Popular Electronics from the 90s, this circuit reaches 100 kHz and battery power is...