| Of necessity, today’s (surround) amplifiers have to come with lots of inputs and outputs. However, a problem occurs if you want to use sever...
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| Lithium-polymer batteries are becoming increasingly common in new electronics equipment. They are superior in terms of both size and weight...
| Digital terrestrial television (DVB-T) is now available in many parts of the country. Of course, you need a DVB-T receiver and a (new) UHF T...
| This audio peak detector allows a pair of stereo channels to be monitored on a single LED.Identical circuitry is used in the left and right...
| A simple NiCd charger can be built using ‘junk box’ components and an inexpensive LM317 or 78xx voltage regulator. Using a current limiter c...
| Lots of consumer electronic equipment like TV sets, VCRs, CD and DVD players employs infrared remote control. In some cases, it is desirable...
| Most darkness activated alarms employ opamps and some logic ICs. Here, a less expensive approach is shown based on the eternal 555, this tim...
| The absence of a mains power outlet is often keenly felt on camping sites, with car repairs in the middle of nowhere and with picnic or part...
| The programmer described in this article has been designed for the well-known P87LPC76x family of microcontrollers manufactured by Philips....
| The circuit presented here is a very simple and yet highly effective alarm system for protecting an object. The circuit requires no special...