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.
Originally recommended to give a tone of transmission in equipment of the 60s (tubed) this circuit is...
Found in a 1967 Electronic Design, this circuit operates in a range of 0 to 1 V input with...
This small transmitter circuit has a range of about 100 meters, and the antenna must be connected to...