This circuit is from a Popular Electronics from the 90s, consisting of a repeater relay for remote control of TV, which today can be done by Wi-Fi or other simpler resources.
With the use of precision resistors and capacitors, this circuit with programmable unijunction transistor...
The 4066 is better than the 401 B because the 401 B has a lower internal resistance when the...
This alarm circuit was found in a 2004 documentation. The circuit searches for open NC sensors....