LM3900 Positive Differentiator (CB5054E)

The circuit shown in the figure has an output voltage rise time of 0.22 ms and an input time constant of approximately 1 ms.

Rain Alarm (CB15108E)
This alarm, from a 1996 magazine, can be fitted with two BC548s in the original configuration...
Simple touch switch (CB9563E)
Using only one general purpose transistor this circuit is powered by batteries. The lamp of the...
Programmable attenuator (CB9031E)
Can be used as a shield, this old American documentation circuit offers digitally selected...