Tymkrs DIY Power Supply

http://tymkrs.com/ is viewer supported, please donate :oD

You can find more information on this project here:

http://tymkrs.com/
http://tymkrs.tumblr.com/post/16294375110/diy-lm338t-variable-voltage-linear-...
http://www.tymkrs.com/forum/viewtopic.php?id=27

Our audio shows:

http://ZombieTech.tv/
http://FirstSpin.tv/

Chat with us live every day:

#tymkrs on irc.AfterNet.org https://tymkrs.com/chat

Help us continue to provide free educational videos, podcasts, and blogs! Your equipment and monetary donations are what make this possible. With just a few clicks you can make a one time donation or set up a monthly subscription, see http://tymkrs.com/ for details. If you would like to donate parts or equipment to the show, let us know at feedback@tymkrs.com.

Category:

Science & Technology

Tags:

• tymkrs
• Power
• Supply
• DIY
• Do it yourself
• make
• maker
• electronics
• hobby
• hobbyist
• linear
• regulated
• variable
• 'bridge
• rectifier'
• full
• wave
• rectification
• smoothing
• capacitors
• filter
• transformer
• bench
• bench supply
• 3.3v
• 5v
• 9v
• 12v
• how to
• howto
• make my own
• cigar box
• solder
• breadboard
• DIY Network
• Training

[neveragaineverever]

Nice power supply. I've got an eerily similar one that I built from a lm317 voltage regulator.

If you don't need to supply very much amperage, the LM317 would be a cheaper, easier, safer drop-in replacement for the LM338 in this design. It's output short circuit protected and current limited to 1.5A.

Other than that, your power supply is identical to mine. Same 28.5V max potential difference and same regulator protection diodes and everything!

[whisk0r]

@neveragaineverever Awesome!! Great minds think alike!

[pyroesp]

Your fuses are on the wrong side of the transformer.

You'd want to protect the voltage regulator.

What you usually would do is put a 1A fuse (if you want to protect it if it goes higher than 1A) after the capacitor.

The current drawn from the 120 AC is much much lower than the current coming out of the voltage regulator.

[whisk0r]

@pyroesp The fuses here are to protect against against a transformer short causing a fire. You could indeed also add a fuse after the regulator.

[Nickelplate1]

That heatsink is more like Princess Amidala than Princess Leia.

[whisk0r]

@pyroesp We'll be posting an update on this :D

[pyroesp]

@whisk0r fair enough :)

[brigfiche]

very nice

[reltham]

Bugs are undocumented features. Since your LED feature is documented, it can't be a bug! :D