This sophisticated circuit for the 90s car was found in the 1993 edition of Radio Electronics Special Projects. It uses components that are still common today.
This circuit is from 2005 documentation. It automatically starts an irrigation pump when the...
This multivibrator circuit was published in the September 1951 Radio Electronics magazine....
This filter has a factor Q = 10 (selectivity), and its frequency can be changed as shown in the...