Found in the February 1997 Electronics Now magazine, this circuit controls motors according to the transistor used. For the transistor indicated, the maximum current is 200 mA.
The LEDs, in addition to flashing if the transistor is good, also indicate the polarity of the...
This circuit was found in a 1980 documentation. It is an interesting 3-track radio circuit whose...
This alarm circuit was found in the July 1992 Radio Electronics magazine. The circuit uses a small...