More about design (647)

1-12-2006 | The situation is a familiar one: in a quiz, whoever presses (or, in practice, thumps) their button first lights their lamp and is given the...

1-12-2006 | This articled describes a method of pre-cleaning ROHS compliant boards to remove silver oxide deposits from copper pads and tracks.

1-11-2006 | In the last few months we’ve received four dozen entries from seven countries, putting the international jury in quite a sweat. The quality...

1-11-2006 | White LEDs have a forward voltage drop of around 3.6 V. If we wish to operate a white LED from a single 1.5 V dry cell or 1.2 V rechargeable...

1-11-2006 | The idea behind this project is a simple one. The power supplies for a (A)DSL modem and accompanying WLAN router can draw a total power of a...

1-10-2006 | This volume control makes use of an operational amplifier and a few passive components to mimic the operation of a logarithmic control while...

1-10-2006 | Suppose you need an oddball resistor value like 2.8 kO but you only have 2.2 kO available. Of course you can create the desired value from t...

1-09-2006 | The circuit allows NiCd type LR03 (AAA) and LR6 (AA) rechargeable cells to be discharged in a controlled manner. The discharging (load) curr...

1-07-2006 | If you are a habitual user of PLCs (programmable logic systems) then you may be frustrated with the fact that you are paying in excess of £...

1-07-2006 | Märklin’s light signal Type 74391 (blocking signal) for size HO model railway sets is fairly new and, at 10 euros (£7•00), reasonably afford...