This circuit with 10 MHz and 1.25 MHz TTL outputs was found in an American documentation from the 1980s. The used integrated circuit is uncommon today.
This static switch or triac contactor was obtained from Philips 1969 documentation. The SCR is...
This circuit was obtained in a French documentation from 1981 and can be easily assembled. The...
This circuit was found in 90s Radio Electronics. The transistor can be any general purpose....