Institute Newton C. Braga

Circuit Bench

Electrometer (CB13653E)
This circuit requires an input current of only 20 fA (femto amps) which corresponds to a...
Current source 741 (CB19947E)
In the figure we have a current source whose intensity is given by the formula next to the...
Mini Electronic Organ (CB12612E)
The circuit is from a 1978 publication and the transistor may be the BC558. The transformer is...