DerFly Posted September 23, 2003 Report Share Posted September 23, 2003 Hello All,Just finished building a modification of the following circuit.http://www.uoguelph.ca/~antoon/circ/vps.htmThe changes I made were to use a 24v 3a transformer as this was available at the time. I also used an LM350 instead of LM317 as it is rated at 3A. Also used a 2A fuse and some other small component changes due to availablility. The LM350 is a metal can type on a large heat sink.So, the unit works and will power a 12v 10 watt light. The voltage varies nicely under this load and also without load. However, when I try to power a 35 watt halogen light, nothing!I suspect that the LM350 might be cutting out due to current overload. Could this be the problem?Would fitting an LM338 (with 5A rating) be the cure?I originally built this as a general power source for use in cutting foam with a NiCr wire, so think that I will need to draw quite high current.By the way, I am an electronics beginner so any help is greatly appreciated Quote Link to comment Share on other sites More sharing options...
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