Institute Newton C. Braga

Circuit Bench

Loudspeaker Protection Delay (CB17465E)
This circuit, found in a 1999 documentation, prevents the speaker from being connected as soon as the...
Transistor gain meter (CB20522E)
This circuit was found in a publication in the 1950s, mainly applying to germanium transistors of the...
Voltage comparator (CB9463E)
Found in Radio Electronics from the 90's, this circuit employs a 3140 operational amplifier, still...