This circuit with the ULN3784B appeared in the October 1984 issue of Radio Electronics magazine. It can typically be powered from 9 to 24 V.
This circuit for car engine spot adjustment was found in an 80's Radio Electronics. The circuit...
Indicated to be used at the sensor input of a PC, this circuit was found in an English...
This oscillator using a 455 kHz ceramic filter was found in the May 1970 issue of Radio...