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| Converting a PC power supply (ATX) to a Variable Power supply. |
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| andyf:
Chris, it might be an idea to build the LM317 circuit in a separate disconnectable box, so that if you ever decide to use the ATX-based PSU to power a motor at variable speed, you could easilly substitute another box containing one of the PWM controllers that Mad Jack suggests. I understand that LM317Ts handle 1.5A for sure, 2.2A average and over 3A if you are lucky enough to get a good 'un. They can be paralleled for more oomph as shown on page 15 here: http://www.datasheetcatalog.org/datasheet2/1/03cgthpfat4t4ly5kfp5lpwladfy.pdf Andy |
| raynerd:
That is actually a really super idea - it`ll just plug straight into the -12 +12v binding posts! Hey, it would even make a nice PIC project if I added a LCD to display the voltage! Cracking idea and I`m also running low on space in there. |
| 75Plus:
Chris, I posted this variable power supply a few weeks ago. It uses 2 LM317T regulators, one controls the voltage and the other controls current. The circuit is all hard wired and no circuit board is required. You can omit the transformer and feed it from the ATX supply. Using +12v and -12v as your input you will have a greater range of voltages available. Actually from 1 to 21 or 22 volts. Have a look. http://madmodder.net/index.php?topic=2551.0 Joe Andy and I were typing at the same time thinking the same way. |
| DMIOM:
--- Quote from: andyf on February 18, 2010, 07:03:51 PM ---Chris, it might be an idea to build the LM317 circuit in a separate disconnectable box,.... --- End quote --- Another benefit of doing that would be that if you used, say, a diecast box you could use it to heatsink the regulators Dave |
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