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.
In the figure we have a regulator circuit for output voltages of 0.5 to 10 V with currents up to...
Found in American documentation from 1968, this circuit has an acute cut-off of the frequency to...
When a model train crosses a level crossing, interrupting the light on the sensor, this circuit...