| This circuit could be used (depending on your circumstances) by a gentleman to summon his butler, a manager his secretary or as in the autho...
Bart Trepak (5)
| There are many situations where two or more pieces of equipment are used together and to avoid having to switch each item on separately or r...
| The vacuum cleaner must be switched on when a grinding or sawing tool is switched on and as the operator's attention must be directed t...
| Most electric kettles do not produce a whistle and just switch off when they have boiled. Fitting a box of electronics directly onto an elec...
| There are many applications where the accuracy of a digital or analogue (bar graph) is not required but something better than a simple low/h...