This circuit was obtained in a 1982 English magazine. The purpose of this circuit is to interface signals other than TTL circuits with TTL inputs. The transistor can be a BC548, 2N2222 or any equivalent.
This circuit is from a Radio Electronics from January 1958. The transistor is the CK722, and the...
This circuit is from a manual of FETs of 1977. The FET can be the BF245 or MPF102 and the relay is of...
This circuit consists of a Step-Down converter (voltage reducer) that can provide a 5 A output with...