Jump to content
Electronics-Lab.com Community
Joe Wu

DC-DC Converter

Recommended Posts

Hi, I have recently built a dc-dc converter to convert supply voltage from 6V to 32V, the circuit diagram is as below:
attachFull120773
 
and the circuit on the breadboard is looks like this:
attachFull120774
 
My friend has built one with the same circuit diagram, I have double checked with him, both circuit connects exactly the same with same components, he circuit is working perfectly fine, but my circuit has a problem. my output voltage jump to the 42V, slowly drops to 32V, jump up again to 42V, slowly drops and it repeats this process over and over again. I have no idea what is wrong with it.
 
Here is how my friend circuit looks like:
attachFull120775
 
Any help will be appreciate!
 
Thank you!
 

Share this post


Link to post
Share on other sites

Your attachments do not work. Usually a circuit built on a solderless breadboard with messy wiring all over the place and intermittent contacts does not work.

I have designed and built thousands of prototype circuits, some VERY complicated, soldered together on a compact stripboard layout and they all work perfectly.

Your voltage jumping at a steady low frequency indicates "motor-boating" low frequency positive feedback. It might be a part that fails when it heats (overheats?) then works again for a while when it cools.

Your attachements are actually links to All-About-Circuits where we must join to see them. Instead attach them here to your replies.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...