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 low impedance circuit was found in an Electronic Design from the 90's. Operational amplifiers admit...
This circuit makes use of an old operational one to generate clock signals that depend on the...
This basic version of the timer with the 555 was found in documentation from the 1980s. The relay...