28 Sep '14, 2pm

Digital Decade Resistance Box on the Cheap

Digital Decade Resistance Box on the Cheap

[Stynus] has finished a unique decade resistance box which doesn’t use conventional rotary switches to select the appropriate resistors. These switches are old fashioned and expensive, so [Stynus] built this decade resistance box that uses a microcontroller and a series of relays to switch the resistors . Simply selecting a resistance on the screen tells the microcontrollers which resistors need to be switched in order to provide the proper resistance. The box uses relays to do switching instead of transistors because the transistors don’t handle high frequency AC as well as the relays. The device is powered by an 18V transformer and rectifier and, as a bonus, [Stynus] got all of his parts on the cheap which made this a great solution to the expensive resistance decade box problem. This is a very well-polished piece of test equipment. We’ve featured other decade resistance...

Full article: http://hackaday.com/2014/09/28/digital-decade-resistance-...

Tweets

Adding a Digital Back to a Sweet Old Camera

Adding a Digital Back to a Sweet Old Camera

hackaday.com 29 Sep '14, 11am

[Eugene] wanted to use his vintage Leica M4 as a digital camera, and he had a Canon EOS 350D digital camera sitting around...

Sound Isolation Box Makes Living Room Based CNC...

hackaday.com 29 Sep '14, 5am

CNC Machines can be loud, especially if they are equipped with a high-speed router spindle. Unfortunately, such a loud rac...

They were definitely cheap...and had an awesome...

namecheap.com 06 Oct '14, 1am

Let's Get Started with Namecheap for Individuals Business Resellers Getting your site online is easier than you think. Fin...

selling the cements cheap

selling the cements cheap

payless.com 30 Sep '14, 2am

Description Easy Returns Care Instructions Get street style on the court with this basketball shoe from Champion! It featu...