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 configuration was found in the Texas Instruments optoelectronics manual. PNP transistors...
This is the traditional configuration of the 7806 as a 12 to 6 V automotive voltage reducer. The...
By connecting several photocells in series, we can directly activate a sensitive relay, as shown in...