This circuit of a 1969 Electronic Design uses RTL logic. The setting can be adapted to TTL. The frequency is given by the crystal.
Found in an Electronic Design from the 90s, this circuit uses components from that time and can...
Using a 4046 PLL this circuit was obtained from the October 1994 issue of Electronics Now...
The circuit shown in the figure is intended to drive solenoids up to 2 A from a signal at the high...