This 1975 tachometer for cars with platinum can serve as an idea for new projects. The components are from the era and a modern equivalent operational amplifier can be used.
This circuit was found in 1966 General Electric documentation. The circuit uses components from the era...
Other voltage comparators can be used in this circuit that we found in a Popular Electronics from...
The integrated circuit used in this application is the Texas Instruments LMV358A, a low voltage...