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 a 1975 publication. The power supply must be symmetrical, but other...
January 2017 - STMicroelectronics' new TN4015H SCRs with 40 A currents and high temperature...
This MOSFET amplifier operating in the VHF range was found in an old American telecommunications...