Found in Popular Electronics of January/February 1969, this transmitter has a few meters range and can be used as a wireless microphone.
CHANDLER, Ariz., Sept. 15, 2015 [NASDAQ: MCHP] — Microchip Technology Inc., a leading provider of...
Operational amplifiers or comparators like those in the LM139 series can be used on this circuit,...
For the low channels (2 to 6) the coil is formed by 5 turns of wire 20 or 22 in a form of 1 cm...