We found this circuit on a Radio Electronics. Similar configurations can be found in this section. The operational amplifier can be of almost any type.
This circuit, found in a 1991 documentation, doubles the frequency of a TTL signal. The maximum...
This 4-20 mA current interface was found on a 90's EDN. The components used are not common today and...
This different power control circuit with SCR was obtained from a 1967 magazine. The SCR can be...