This circuit makes use of an integrated LM2907. The circuit is from an old documentation being applied to cars that still used platinum, common at the time.
This TTL instructional circuit appeared in the February 1972 issue of Radio Electronics magazine. 5 V...
Using the HA2400 this circuit has its output voltage digitally programmed from the references...
We found this circuit in a European publication from the 1970s. The transistor is made of...