A staple of the radio amateur’s arsenal of test equipment in previous decades was the dip meter. This was a variable frequency oscillator whose coil would be placed near the circuit to be tested, and ...

In the ham radio trade, gear such as the old Drake units [Dr. Scott M. Baker] has in his radio shack are often referred to as “boat anchors.” It refers to big, heavy radios that were perhaps a bit ...

Since its invention over a half-century ago by Hanz Camenzind at Signetics, the familiar 555 analog timer (in league with its updated pin-compatible CMOS descendants) has become an iconic design ...

The circuit aims to imitate a chirping canary made of electronic circuit components such as the Hartley Oscillator. Hartley Oscillator – a variable frequency oscillator circuit where a center tapped ...

The monograph describes an electronic method of varying the effective value of an inductance and derives the theoretical value of an inductance and derives the theoretical value of this inductance.