This resistance meter was found in an English documentation from 1989. The operational amplifier admits an equivalent and the transistor can be a BC558 or BC559.
We found this circuit in a Gernsback documentation from 1960. The circuit is intended for...
The frequency range of this circuit depends on the transistors used. The circuit is from a Radio...
This circuit consists of a good perfromance audio amplifier powered from two or four batteries and has...