ghostman11
Well-Known Member
hi, lately i been looking for a variable power supply for the bench, at present i have a simple fixed voltage supply that i made from a old ATX PSU from a defunct PC. It's worked well and so far done pretty much all i need. i have 5v 12v and 3.3v.
but as time goes by and i am starting to look into different stuff for logans train project etc, i have often thought a bench supply i could vary would be useful and perhaps one with a negative supply would be great for messing with opamps and the like. so i have a couple of questions just to check i am on the right track.
BTW yes i could go splash some cash and just buy one!! but not much to be learned from that and on the face of it i dont think what i am after should be that hard to do. so what exactly would i like from it???
well for starters i would like to use the ATX PSU as the base of the project
2. keep 3 fixed voltage outputs of 3.3v 5v 12v
3. 3 variable outputs, now realisticaly from what i been reading theese will probally be easiest to do if the fall between 1.5v upto 10v, so i have the LM317t voltage reg in mind for the project wich would also give me a max of around 1.5A (plenty for most what i do)
4. i would like a digital LCD readout of all chanels for voltage so my guess is a pic with lcd with the voltage read via ADC?
5. negative variable voltage on 3 seperate channels, here i need some recomendations on the best voltage reg to use, again voltage would be -1.5v --10v
anything else you can think of that would be pretty simple to add and nice to have?
and most important of all......am i on the right track or heading down a blind alley?
cheers chaps
but as time goes by and i am starting to look into different stuff for logans train project etc, i have often thought a bench supply i could vary would be useful and perhaps one with a negative supply would be great for messing with opamps and the like. so i have a couple of questions just to check i am on the right track.
BTW yes i could go splash some cash and just buy one!! but not much to be learned from that and on the face of it i dont think what i am after should be that hard to do. so what exactly would i like from it???
well for starters i would like to use the ATX PSU as the base of the project
2. keep 3 fixed voltage outputs of 3.3v 5v 12v
3. 3 variable outputs, now realisticaly from what i been reading theese will probally be easiest to do if the fall between 1.5v upto 10v, so i have the LM317t voltage reg in mind for the project wich would also give me a max of around 1.5A (plenty for most what i do)
4. i would like a digital LCD readout of all chanels for voltage so my guess is a pic with lcd with the voltage read via ADC?
5. negative variable voltage on 3 seperate channels, here i need some recomendations on the best voltage reg to use, again voltage would be -1.5v --10v
anything else you can think of that would be pretty simple to add and nice to have?
and most important of all......am i on the right track or heading down a blind alley?
cheers chaps