9V LED Signal Kit  

MFR:  Velleman
Make:  MK131 
Years Made:  Current Production
Estimated Year:  2006 

Notes, Commentary, Restoration: 
This is a kit provided as an unpopulated circuit card and all the components (except battery and tools) to complete the kit as shown.  Some prior soldering experience is suggested, build time is under two hours.  The signal has realistic timing, and does the American Style Green1-Yellow1-All Red-Green2-Yellow2 sequence.  Thanks to the use of a heavyweight 9V battery, the signal will stand on its own.

A single counter chip is fed by an oscillator circuit set up by the transistors. The large array of diodes serve as AND logic controlling which lights come on when. The potentiometer adjusts the timing of the light from normal to slow, it can be set to take upwards of a minute to complete the six phases of operation.  The LEDs are the classis size and diffused lens style so they are best viewed straight-on, and do not show well at an angle, nor are blindingly bright, thankfully.  

Photographic Records: 
   

Copyright © 2007 The Signal Saloon
All Rights Reserved

The Signal Saloon materials, including internet pages, documents and on-line graphics, audio and video, are protected by copyright law. Copyright of The Signal Saloon materials resides with the Author. Apart from any fair dealing for the purposes of private study, research, criticism or review, as permitted under the provisions of the Digital Millennium Copyright Act of the United States of America, no part may be reproduced or re-used for any commercial purposes whatsoever without prior written permission of the WebMaster. Trademarks, corporation names, etc. are used without license and do not imply an endorsement of product or service.

This page was last modified on 11 February 2007.