Found in Popular Electronics from the 90s, this circuit has LED indicators that show when the battery is full charged and the shutdown relay is activated.
This low-pass filter was found in an American publication from the 80's. The circuit uses an...
This continuity tester for low resistances was found in an English magazine from 1978. The circuit...
This low-pass filter with 741 op and symmetrical source was found in the August 1993 issue of...