This circuit for cars of the time was found in a Popular Electronics magazine from the 90s. The circuit is based on CMOS logic that is common even today.
This is a complete version of the previous circuit, with several scales and two transistors, one...
Published by Philips in 1965 documentation, the sensor for this circuit is a common LDR. The...
This circuit is used to test a triac and also to teach how it works. The load is an incandescent...