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 90s nHands On Electronics, this circuit triggers a relay that shuts off the load when...
This circuit uses germanium transistors and has a push-pull output with transformers. The circuit is...
Frequencies up to 50 MHz can be produced by this circuit, depending only on the used XTAL. L and...