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 is the conventional astable configuration of the 555 integrated circuit already explored in...
This circuit was originally designed to maintain the temperature of a brooder at 41º C. However,...
Originally suggested by Popular Electronics to control Christmas lights, this circuit can...