This circuit was found in a British documentation from 1969. It can be implemented with modern transistors. The pass band is 6 MHz.
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...