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.
This circuit can be used to recognize a tone by its frequency. When this tone is present in a...
This circuit is from a 1975 amateur radio manual. The components can be approximated to the...
This circuit is from an English publication from 1976 but can be easily assembled with BC548...