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.
Originally the circuit in the figure is indicated by National for the control of an electronic car injection...
This circuit is from the owner's manual of the integrated circuits used. The manual is old, which...
We found this configuration in a 1974 technical documentation. It can test both TTL logic circuits and...