Institute Newton C. Braga

Circuit Bench

7 W FM Transmitter (CB18602E)
The transmitter we have described, operates at a frequency between 88 and 98 MHz, with a range of the...
Electronic Answering Machine (CB18689E)
This is the circuit equivalent to the small key chains that were common in the 90s that emitted a...
10 to 60 Minute Timer (CB17978E)
This sophisticated digital timer was found in a 2002 documentation. Since CMOS integrated circuits are...