J. Ruffell (55)

1-12-1991 | The measurement card for the indoor /outdoor thermometer "may be provided with the additional LED indicator shown in the diagram to check...

1-12-1991 | This is an improved version of the slave mains on-off control published in the July 1990 issue of Elektor Electronics. The circuit has be...

1-12-1991 | Texas Instruments' TPIC2404 is a monolithic, high-voltage, high-current, quadruple switch especially designed for driving peripheral loads...

1-11-1991 | To achieve a comfortable room temperature quickly it is often required to switch on the central heating (CH) boller tor ten minutes or...

1-10-1991 | The electronic hygrometer, or relative humidity (RH) sensor, discussed here is remarkably accurate, and functions automatically as part...

1-07-1991 | Clocks, as most of you will be aware, can take many shapes and sizes. Here is one with a fairly unusual read-out, intended as an eye catch...

1-07-1991 | National Semiconductor's LM334Z is a temperaturedependent adjustable current source supplied in a plastic TO92 package. A 226 Ω resistor...

1-07-1991 | Normally, a Wien bridge oscillator contains two identical capacitors and two iden tical (variable) resistors. That being the case, the t...

1-07-1991 | If you have a non-qwerty keyboard and would like to use this with your computer without having to reIearn where the deviating keys are, this...

1-07-1991 | Depending on its location, linear voltage regulators are arranged traditionally into two sub-groups: series and shunt (or parallel) regu...