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 circuit was found in a Popular Electronics of 1993. The operational amplifiers can be the...
Here we show how two 4017s can be cascaded to count above 10. The circuits are driven by a square...
This circuit produces two signals with inverted phases. One is taken for the emitter of Q1 and the...