Institute Newton C. Braga

Circuit Bench

Solar telephone (CB20504E)
This low-power intercom can be powered by solar cells. The circuit is two-way, with an integrated of the...
Comparator Reverse Switching For Interface or Shield (CB4590E)
Reversing the switching action, with the output going high when the input is low, can be done by...
Low Frequency Converter 4538 (CB25388E)
This converter was found in the June 1991 issue of Radio Electronics magazine. The circuit uses...