Narrow-bandwidth Television Association
All of the projects contained in this book can be
built with the mini-mum number of small hand tools in a kitchen type workshop.
Care should be taken when using these items especially tools with sharp cutting
Some projects contain spinning discs which should be shrouded where possible to
avoid contact with humans or pets whilst turning.
Many of the latest LED's come with warnings with regard to eye damage. It is
therefore important to ensure that a suitable diffuser is placed in front of
these when viewing.
Our main concern is with mains supply voltages. Most of the projects may be run
of a fully encapsulated mains adapter such as those often supplied with low
power battery/mains consumer electronic equipment. These provide a safe low
voltage supply at low cost. However, the voltage and current rating should be
checked for compatibility with the intended load. Should you choose to use mains
transformers included in your own 'home brew' power sup-plies ensure all exposed
mains wiring is insulated and good safe wiring techniques are observed. All
mains supplies should be fused accordingly. If you do not feel confident using
mains voltages then use batteries or purchase commercially available units.