This circuit is from LinearTechnology Applications of 1997. The circuit uses components of the time used to raise the voltage of a battery from 3 to 6 V.
We found this frequency meter circuit in a 1974 documentation. The circuit is powered by 12 V and...
This high gain small signal amplifier circuit was found in an old publication on transistors....
This circuit can be used with input voltages up to 750 V, regulating the current between 200 uA...