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.
This simple charger was found in a 1980s documentation. The transistor may be the TIP42 with a...
We find this simple tone modulated signal generator in a 1987 publication. It uses common...
In a voltage follower the gain is unitary. Input impedance is too high and output impedance too low....