In the figure we have a simple thermometer with NTC, using an analog current indicator. The adjustment is made in the trimpot and the power is done by batteries.
This oscillator controlled based on a CMOS 4011 can produce signals from a few hertz up to more...
We found this circuit in the October 1994 Electronics Now magazine. The CMOS IC is uncommon these...
This configuration can be implemented with equivalent operations. The circuit is from the 1990...