Peter Lay (24)

1-07-2008 | Here we take a light-hearted, exploring yet purposely unscientific look at one of the fundamental effects of physics, namely contact voltage...

1-03-2006 | If a relay is driven by a transistor switching stage it is usual to connect a flywheel diode in parallel with the coil to short out the back...

1-02-2006 | This ultra-simple circuit will produce the familiar sound of sirens used by US police cars on emergency calls. A small lamp will also flash...

1-01-2006 | This design for a Christmas tree lighting system employs ten red light emitting diodes (LEDs) instead of the usual lamps. The LEDs are power...

1-09-2005 | An IC socket with turned contacts can be used as a simple, low-cost experimenter’s board allowing small circuits to be built and tested quic...

1-07-2005 | Mixing signals at different frequencies is common practice in many areas of electronics. Audio systems, communications systems and radio sys...

1-12-2001 | Clock radios often give atrocious reception, even when properly tuned in. This is not surprising when you consider that they usually only us...

1-12-2001 | We’ve all had occasion to be annoyed at inconsiderate dog owners whose animals relieve themselves on the private property of others. This pr...

1-07-2001 | With the well-known TDA2030V integrated power amplifier in the Pentawatt package, it is easy to ‘activate’ a PC loudspeaker or upgrade the q...

1-07-2001 | Whenever an antediluvian electric doorbell is used in an apartment building, the rain of sparks that is generated when the Wagnerian hammer...