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.


Circuit Solutions Notebook
Last Updated On:  Tuesday October 24, 2017

Latest Technical Challenge           Previous Circuits Solutions           Circuit Solutions in Progress

Non-Isolated Off-Line AC to DC Power Supply


Is it possible to design a circuit that can efficiently produce say 6 volts at a couple watts, without the use of a transformer or switching regulator?  The circuit would not have to be isolated from the power line.  Also, can the circuit be designed to fit inside a one square inch circuit board area?


The design below does indeed fit within a one square inch circuit board area.  It can be used over a wide 24vac 120vac input voltage.  The circuit gates only small slivers of the rectified AC signal to a 470uF energy storage capacitor.   The 180K and the 10K resistors define the peak voltage fed to the capacitor.  Other resistor values can be used to shift the DC output voltage up or down.  Remember, this circuit should only be used with DC circuits that can be connected directly to the power line.  Dangerous voltages exist everywhere.








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.