This circuit is from the time when cars used contact breakers. This 80's version measures the dwell angle of the contact breaker for dwell adjustment using an era integrated circuit, the LM3917.
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...