This traditional configuration with the 555 was obtained in an 80s Hands-On Electronics. The relay is of the sensitive type according to the supply voltage.
Found in the 2005 Linear Technology Application Manual, this circuit controls the torque of a...
This circuit was found in a 90's Electronic Design. It takes advantage of the nonlinearity...
We found this circuit in an English publication of 1976. It can be easily assembled by changing the...