If you cultivate an interest in building radios it’s likely that you’ll at some point make a simple receiver. Perhaps a ...

Sometimes, it is useful to transmit a low-power radio signal to create a beacon, to send a signal carrier to a near receiver, to transmit in QRP or QRPP mode, and so on. The circuit shown here is very ...

When we build an electronic project in 2016, the chances are that the active components will be integrated circuits containing an extremely large amount of functionality in a small space. Where once ...

This circuit is essentially an amplified crystal set. The inductor could be a standard AM radio ferrite rod antenna while the tuning capacitor is a variable plastic dielectric gang, intended for small ...

A very simple but highly efficient combination lock circuit is shown in the figure. Any type of on/off switches can be used, varying from commercially available inexpensive types to more sophisticated ...

Baldwinsville, NY -- In 1953, the cutting edge of technology was the transistor, and General Electric’s plant in Salina was where theory was being turned into reality. A team of engineers led by ...

A handheld AM or FM radio. All handheld radios, as well as desktop radios, use transistors, both discrete as well as contained in chips. The transistor radio was one of the first consumer devices that ...

And now a page from our "Sunday Morning" Almanac: October 18th, 1954, 61 years ago today ... the day Dick Tracy's wristwatch radio came its closest yet to reality. For that was the day Texas ...