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 an application manual for linear instruments from Texas Instruments. The...
This circuit from a Japanese publication in 1968 uses germanium transistors from the time like the...
The presented circuit uses a window comparator to keep a relay activated only when the sensor is...