- on Miscellaneous Electronics
- Published in issue 7/2010 on page 32
Digital Thumbwheel Switch
(Summer Circuits 2010 article)
Thumbwheel switches are remarkably expensive and always playing hard to get. Here’s a cheaper, digital equivalent with the ability to remember the value it was set to. It is programmable to different modes such as inverted or non-inverted BCD code output, programmable READ pin active level, and the choice of hexadecimal or decimal BCD count.