Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 45,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to original material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


Safety Flasher
All materials and content contained on this page are the exclusive intellectual property of Andrew R. Morris and
may not be copied, reproduced, distributed or displayed without his express written permission.

Safety Flasher This circuit alternately flashes two high-brightness LEDs as a safety measure during jogging or walking. The LEDís can be mounted on clothing or a belt. The circuit draws a precisely controlled 10mA in order to conserve battery life. Also, the battery voltage can drop to the LED voltage plus about .5 volts before there is a noticeable change in performance.

The LEDs actually act like voltage regulators. Because the blue LED has a higher drop voltage, it will dim rapidly and then go out first (about 3 volts) with decreasing battery voltage. The yellow LED will keep blinking unaffected to about 2 volts of battery voltage. Also due to the higher voltage drop of the blue LED, the blue LED is on for less time than the yellow LED at normal battery voltage.

The circuit is built into a Radio Shack 4 AA cell battery holder with switch (RS P/N 270-409). The battery compartment farthest from the switch was used for the electronics. C2 and C3 were added because the long wires I used for the LEDs caused instability of the flasher circuit. I admittedly went overboard with the LED wires.

More:  LED (Light Emitting Diodes) Circuits Light Flashers 

Got Designs?
Please eMail
if you want me to link to and/or post your original design Thanks.


HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy


Copyright  January, 1998 - November, 2017     David A. Johnson & Associates.  All Rights reserved. 


 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.