We found this circuit that can reach 50 MHz in the February 1997 Electronics Now magazine. The integrated circuits used are not very common today.
This circuit was found in a 1964 documentation. It shows how to achieve automatic gain control for...
Using transistors at the time, this circuit was found in a 1967 Ferranti documentation. The...
This circuit, which controls both the temperature and the level of a liquid in a reservoir, was...