| When it comes to input selection in a preamplifier, the use of a relay is always better than a simple rotary switch - at least from a qua...
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| High-frequency signals cannot be measured with standard voltmeters or multimeters. Such voltages, which are commonplace in receivers,...
| It would be all too easy to describe the DS1620 as a simple temperature sensor: in the present circuit, the device doubles as a thermo...
| Every day, a lair number of readers contact us asking when a particular article was published. "Did you ever do a bat detector?" "Where...
| Coils having self-inductance have a mystique for many electronics constructors and designers, particularly amateurs, that is quite unwarrant...
| When combining water and electricity it is essential that the current flow be a.c., else electrolysis will eat one elecriode away. This...
| With the electric-bulb tester you cannot only verify whether a bulb is still in working order, but, if so, also find its wattage. True,...
| Infra-red remotely controlled equipment is provided with a standby mode in which it remains ready to operate at a simple command of a...
| Although the human eye is unable to detect infrared light, this Kind of light is emitted by many apparatus around us in everyday life....
| Most ohmmeters and cable testers have either a moving-coil meter or a liquid crystal display (LCD). The circuit described here presents...