Institute Newton C. Braga

Circuit Bench

Low Current Detector (CB6667E)
This circuit is from a 1967 documentation. It makes use of varicap and diode tunnel in addition to...
Voltage Comparator VCO (CB13132E)
A configuration using three of the four voltage comparators on the LM339 is shown in the figure and...
Simple Analog Tachometer (CB13969E)
This circuit, which uses germanium transistors, is from a 1965 English magazine. The used...