(click picture to enlarge)
No one can call themselves an electronics hobbyist
unless they have built a timer. There are several designs using a variety of new and sometimes old
circuits. Witness the longest surviving IC of all, the 555, introduced over 20 years ago. Most timers have
one characteristic – they only timed one thing; an egg timer, a delayed timer, a timeout timer, a flasher, a
photographic timer, etc. As you will see these days are almost over.
Micro-controllers have changed all that. This kit contains
Seven different timing modes using only
ONE IC and a few components on a single-sided PCB. This is a lot less than many single-mode
traditional timers. The timing modes and delay ranges are selected by on-board DIP switches. Simply select
the time delay you want and that’s it – no adjustment required.
CK1614.pdf for complete
details, including schematic and theory of operation. Requires
Adobe Acrobat Reader available at