Electronics Now articles from November 1993

Electronics Now archives from November 1993

Build a diversity antenna and improve the performance of any car stereo! (Cover Story)
November 1, 1993... Eliminate multipath noise from your FM radio as you drive with this diversity circuit that switches antennas. WHEN LISTENING TO AN FM STATION in your car, have you ever noticed the sudden onset of noise--pops, clicks and hum--that lasts for...

Weather station. (instruments that provide accurate temperature information)
November 1, 1993... Here comes the rain--let's make sure our weather station is ready for it. IN LAST MONTH'S ARTICLE, CONstruction details for an anemometer, wind vane, and rain gauge were described. Now it's time to build the sensors to measure temperature...

DTMF decoder. (dual-tone multifrequency)
November 1, 1993... Scanner users: here's an inexpensive way to decode DTMF tones that you hear. HAVE YOU EVER BEEN CURIOUS about the dual-tone multifrequency (DTMF) tones heard on your scanner or amateur-band receiver? The circuit discussed here will decode...

Build a novel LCD ammeter and RF power meter. (Duracell Inc.'s Copper Top Tester)
November 1, 1993... Make useful and inexpensive ammeters, power meters, or temperature indicators from Duracell's Copper Top Testers DURACELL INC. REVOLUTIONIZED the marketing of consumer electronics batteries with its Copper Top Tester, a disposable instrument...

100-watt dummy load. (50-ohm amateur radio dummy antenna)
November 1, 1993... THE DUMMY ANTENNA OR DUMMY load described here will substitute for "the real thing" when you want to tune or test a transmitter "off-the-air" and prevent the radiation of interference. This 50-ohm load will dissipate up to 100 watts in the 160-...

Autopatch selector for radio amateurs.
November 1, 1993... With our autopatch selector you can control almost anything from your UHF transceiver. THE SIMPLEX AUTOPATCH, A CIRCUIT that allows amateur radio operators to access the dial-up telephone system from their UHF transceivers, is perhaps the...

Transistor cookbook. (common-emitter and common-base bipolar transistor amplifiers)
November 1, 1993... Learn about common-emitter and common-base bipolar transistor amplifiers to help you design your own circuits. THE CHARACTERISTICS OF COMmon-emitter and common-base bipolar junction transistor (BJT) amplifiers differ from those of the...