This circuit is from the 1990 Motorola Data Databook. The circuit can be implemented with equivalent transistors. The power supply must be symmetrical.
This circuit can be used to measure the frequency of a low frequency square signal. The signal can be...
You can program the 4018 in other ways, as shown in the figure. In this 7 divider configuration, for...
The figure shows a simple circuit to power LEDs from the AC Power Line. The resistor can be a wire...