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Last Updated:
Monday, January 05, 2009 03:44 AM |
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Featured Circuit of the Week |
Isolated Remote Switch Circuit NEW
There are many applications when a remote switch’s on/off status needs to be monitored. Reed relay sensors, toggle control switches and security alarms contacts are just a few examples. Routing a switch directly to a computer system hundreds of feet away
can often lead to erratic .... |
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All Circuits of the Week |
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Featured Circuit Last Week |
Remote LED Indicator Light
There are times when you would like to transmit a signal from one LED indicator light to second LED at another location. The circuit below works well for this application. It takes advantage of the fact that the internal infrared LED inside an opto-isolator
has a lower voltage drop than the visible LED being tapped into. Using a darlington type opto-isolator also means very little current needs to be diverted to the isolator..... |
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All Circuits of the Week |
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Dave's other websites to visit: |
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collection of resources for inventors,
hobbyists, scientists & engineers |
resource portal for information
regarding renewable, alternative
or sustainable energy |
Dave Johnson & Associates -
consulting services for new products from conception to production or improving the
cost & performance of existing products |
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David A. Johnson, P.E. is an electronics engineer with over 30 years practical experience in the areas of analog & digital design, fiber optics and RFID.
Electronics is his vocation, hobby and passion. He is a published author with articles and designs in EDN, Electric Design, Midnight Engineering and Popular Electronics. Throughout his career, Dave's imaginative approach to design has resulted in applying new technologies in
creative and cost saving ways. |
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