This TTL circuit found in the September 1996 issue of Electronics Now magazine doubles the frequency of a rectangular signal. The power supply must be 5 V.
This circuit was obtained in a manual of the used old operational amplifier. However, the same...
This circuit can gerenate square signals and be comanded by na external control. When the input...
The sensor for this circuit is a phototransistor. We found it in the April 1971 issue of Radio...