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4hv.org :: Forums :: General Science and Electronics
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Simple PSU Circuit Help

Move Thread LAN_403
Matt Edwards
Tue May 11 2010, 03:28AM Print
Matt Edwards Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
After considering the good information that everyone was so kind to provide me, I have decided to try something else.

How would I modify a circuit similar to the one below to produce 12-24v rather than 0-24v? It doesn't have to be exactly 12-24v. It is just a ball park figure.
This is beyond my current knowledge of circuits.
1273548486 2838 FT0 Lm3173
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Steve Conner
Tue May 11 2010, 09:11AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Put a fixed resistor in series with the 5k pot. I won't calculate the resistor value for you.
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Matt Edwards
Tue May 11 2010, 09:34PM
Matt Edwards Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
Thanks for the help
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Matt Edwards
Wed May 12 2010, 05:04AM
Matt Edwards Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
I believe that I have asked a question in which I already knew the answer to.
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Mads Barnkob
Wed May 12 2010, 07:55AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
At page 11 in the datasheet you took the screenshot from there is a interesting 4A 4,5 - 25 V regulator example, using 3x LM317 and a opamp.

You should give that a try after you complete the first :)
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Matt Edwards
Wed May 12 2010, 01:27PM
Matt Edwards Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
Thanks. I am worried about heat dissipation so i am working on alternative solutions to the poblem.
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Zeus
Wed May 12 2010, 11:04PM
Zeus Registered Member #2316 Joined: Tue Aug 25 2009, 03:04AM
Location: Bendigo, Australia
Posts: 107
Try a bypass transistor TIP35C, it handles 15A.
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