Using a 4046 PLL, which is not very common nowadays, this circuit was found in the October 1994 issue of Electronics Now magazine. The power is provided by the transistor and is small in this case.
This circuit was found in Motorola's 1968 documentation. The SCRs are then replaceable with...
This circuit was found in a French magazine Toute LÉlectronique from 1978. Transistors are not...
This circuit can be used in a single optical link or optical communication system and even using an...