Muting Circuit (CB25267E)

This circuit mutes a system when a phone call is received. The circuit is from a Radio Electronics from December 1990.

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Car Alarm (CB3835E)
This alarm circuit is from a 1987 publication, however the components used are still modern. The...
Transistor Tester with the 741 IC (CB1497E )
In the figure we have a configuration that allows to test NPN transistors and with the addition of a...
0 to 200 nA Current Sensor (CB5390E)
We find this current meter circuit from 0 nA to 200 nA in a Linear Technology application manual....