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.
What this circuit does is change the logic level of a signal thus serving as a different logic...
This electronic flash circuit was found in the March 1961 Radio Electronics magazine. The circuit...
On this website we show how to calculate the components of this circuit for other frequencies. The basic...