This circuit is from a 90s Radio Electronics. The resistors must be precision types and the transistor is a general-purpose type. The operational admits equivalent.
In this circuit, which uses only diodes, we have both simultaneous functions. The diodes are...
This logic tester circuit was published in the November 1980 issue of Radio Electronics magazine. The...
This circuit was found in a 90s Popular Electronics. The circuit uses 4 bicolor LEDs to indicate...