This instrumentation circuit was found in the September 1989 Radio Electronics magazine. The circuit uses an analog indicator and the power supply must be symmetrical.
We found this circuit in Ferranti's 1974 transistor manual. Transistors are general-purpose types...
This circuit for a receiver was found in an English documentation from 1963. The transistor is made of...
We found this oscillator in a publication for radio amateurs from the 70s. The circuit generates...