This RF circuit measures transmission power from 0.25 W to 10 W. The maximum frequency depends on the diode and the gauge is an analog instrument. A multimeter can be used instead.
This charger can be used with one to four AA, AAA, C or D cells. The maximum current is given by R...
This wireless infrared remote sound transmitter is from an article published in the August 1988...
This circuit turns on an old cassette recorder when the telephone rings, thus enabling the...