Jump to content
Electronics-Lab.com Community

Ripple Rejection DC power supply

Recommended Posts

I m trying to make a variable voltage Rectified power supply using LM338. But i am facing an unusual problem of ripple at the output of LM338. when I set the Output at the particular voltage, the ripple current at the output just doubles the DC value.
just as if DC o/p = 12 volts.
AC o/p = 24 volts.

The exact specs. of the components are as follows:

Transformer- 220/15-0-15 volts, 5 Amps. (center tapped)
Diodes- MIC 6A4
Cap.- 10,000 microfarad /25 volts.(at the o/p of rectifier)
large value is just to keep the low ripple

LM338: 0-5 Amps. input- output differential voltage = 3 volts

Why do this happens.
pls explain.

I want to completely remove the ripple content.

Link to comment
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.

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.

  • Create New...