| The preamplifier described is a pushpull type based on a pair of inexpensive JFETs. With a few changes to the circuit, coverage may be...
Joseph J. Carr (26)
| The p-i-n (or PIN) diode is a semiconductor diode that contains a region of almost intrinsic (i-type) semiconductor between the p-typ...
| Last month we examined the basic theory of loop antennas, and demonstrated some of the basic forms of loop antenna, resonating methods and...
| The Very Low Frequency (VLF) bands are found between 10 kHz and 30 kHz; the LF frequencies occupy 30 kHz to 300 kHz; and the medium wave...
| In radio frequency electronics a mixer is a non-linear circuit or device that permits frequency conversion by the process of heterodyning....
| In the previous instalment of this article we examined the theory behind direct conversion receivers (DCR). In this final instalment we w...
| The direct conversion or synchrodyne receiver was invented several decades ago, but only with the advent of modern semiconductor technology...
| A lot of electronic construction projects intended for hobbyists and amateur radio operators call for inductors or radio frequency (RF) t...
| Resonant 'tank' circuits consist of combinations of inductance (L) and capacitance (C) elements configured in such a manner that a single f...
| Amplifiers are used to boost weak electrical signals to higher levels. For example, a voltage amplifier will boost a weak voltage signal t...