This 4-tube counter was found in Radio Electronics magazine from December 1959. The circuit uses a coil as a sensor to detect the passage of metallic parts or magnets.
This circuit was found in February 1976, Radio Electronics magazine. The components are from the...
I found this circuit in a 1993 technical documentation. When we press the switch in parallel with...
This circuit provides two outputs of the same signal. One with the original phase and the other...