This low frequency circuit was found in documentation from the 1980s. The values of R and C determine the frequency. Inverters can also be designed with logic gates.
This circuit monitors the temperature of soldering irons, taking them when necessary to a low...
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...
In this circuit the CA3140, an operational amplifier, is used as a comparator with the zener diode...