This 1969 Mullar circuit appears elsewhere on this site. The circuit uses germanium diodes and the indicator is microammeter with zero in the center of the scale.
In the figure we have the way to implement a monostable with a comparator 139, 239 or 339. The...
July 2017 - Mouser Electronics is providing the TE Connectivity PTF Series Platinum family RTD...
This circuit was found in an American documentation from the 90's. The circuit can use almost any...