This dual flasher for high brightness LEDs was found in an American documentation from the 90's. The circuit can be powered by lower voltages with the reduction of R1 and R4.
Found in a Hands On Electronics from the 80's this circuit allows the reading of low resistances in...
The figure shows how to implement an inverter trigger using the LM3900. The LM3900 is a NORTON...
This stepper motor control was originally designed to use a PC's parallel port and is quite simple...