Institute Newton C. Braga

Circuit Bench

Comparator with Hysteresis LM139 (CB4007E)
This circuit, from the 1990 Motorola Dataar Databook, can use any LM139 series comparator. The circuit...
Benchtop Amplifier (CB6978E)
Suggested by a Popular Electronics, this small amplifier that has a detector to follow RF...
Signal Injector with 555 (CB25532E)
This application of the 555 was found in the November 1992 Radio Electronics magazine. The...