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.
Found in a 1969’s documentation, this circuit can supply currents from 100 to 120 mA at loads of...
We found this receiver in old documentation. The transistor is made of germanium and the...
We found this project in a 1982 publication. What we have here is an audio signal relay trigger, which...