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

DiscoverCircuits.com has links to 45,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.

HOME Schematics Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches
Welcome to DiscoverCircuits.com - online since 2002

See Media Kit for
Advertising Opportunities

Attention Designers:  Please alert us by eMail if we have linked to sites
where your original material has been copied without your permission.
We will change to the LINK to your site.  
Thank you.


Circuits designed by David Johnson, P.E.
Last Updated on: Wednesday, October 18, 2017 05:04 AM

List of Dave's Circuit Designs

The contents & graphics of Discovercircuits.com are copyright protected.
LINKING to Dave's circuits is permitted but DO NOT COPY any files to your WEB SITE server

More  Lamp / Light Control Circuits      Switch Circuits    Control Circuits

Pushbutton Controlled Up/Down Ramping Light  (March 15, 2009)

There are times when you want a lamp to gradually change from dark to light and from light to dark, with each push of a pushbutton switch.  The circuit below performs this control function using a flip/flop and a classic pulse width modulation or PWM method.  The circuit uses a common flip/flop IC to control the on and off logic states. A simple pushbutton switch toggles between the two states with each press of the button.  A 555 timer is used to generate a triangle waveform clock while a common voltage comparator produces the PWM signal.  An n-channel FET switches power to the lamp with up to 3.5 Amps of current.  This power switching device can be sized as needed, so it could control much higher current if needed. The circuit will operate from 6v to 15v.  With the component values shown, the lamp will slew from dark to light in about two seconds.  This time can be lengthened or shortened by changing the value of the 1uF capacitor.

Click on Drawing Below to view PDF version of Schematic

More  Lamp / Light Control Circuits     
Switch Circuits     Control Circuits

Dave's Circuits

eMail David A. Johnson, P.E. about this circuit



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

Discovercircuits.com endeavors to credit original designers.   Please alert us by eMail so we can
delete links to material that have been copied without your permission
.   Thank you.

Copyright of all original material on this website is the property
of David A. Johnson, P.E. (Dave Johnson & Associates ) unless otherwise noted.  

Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.
All material is provided "as is" without guarantees or warranty of any kind, either expressed or implied.