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Electronics Today Contents |
Terry Balbirnie describes how to trim and mount rotary pots and rotary switches correctly.
Fingerprints are a familiar means of identification, but they are not very easy to identify automatically. Neural networking and several new hardware developments are all part of this fast-developing security technology.
The Phillips/Signetics I2C bus standard is now used by around 1,000 ics to send data by clock and data signal rather than via a 16-bit data bus. In the first of two articles, Robin Abbott describes how to drive the I2C bus from a PIC.
The main cause of problems with a newly constructed or upgraded computer is completing the set-up and getting the operating system installed. Robert Penfold looks at some teething problems, and how to cure them without feeling like a dummy.
ETI visits the Engineering Recruitment Show and finds that employers are still looking for a sound skills base when interviewing.
Pei An describes a general purpose infra-red remote receiver which could be implemented in equipment where remote control is needed. Its partner is a handset transmitter using the BL9148/BL9150 chipset.
Raymond Haigh's adapter circuit allows the Q factor and inductance of RF coils to be measured with a low-impedance output signal generator and a high-impedance electronic multimeter.
Andrew Armstrong dips into his collection of useful design fragments, including microamp voltage regulation and temperature reduction for solenoids.
It looks like an ordinary illuminated duck, but Bart Trepak's water safety sensor may save you from a painful scalding (or freezing) on bath night, and provide that colour coded use for a blue LED that you've always wanted to try.
Owen Bishop describes the use of divider chains to produce prolonged timing periods, with two demonstration boards: a divide-by-60 chain and a 15-minute timer are included, with programming examples for the 4018, 4541 and Basic Stamp.
This 20-MHz scope looks very much like a 'pen'-sized multimeter and has a lot of functionality in a small space.
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Copyright © 1998 A. S. and H. P. Armstrong