ghostman11
Well-Known Member
hi, i am doing the first part of this post for LG because of safety matters. first things first.. yes we can google, yes we have googled but.... because i am concerned that he is safe i wanted advice here first so we know what to google etc also i would prefer it if he gets answers or at least advice on what to google for from here so he dosnt just go off and build a death trap, second he will be posting and doing the actual build but for all live testing i will be doing it or at least watching him like a hawk!
so the project!
he wanted a lab PSU for christmas but when i saw the price (£200+) i desided to spend it on something else for him, and he realy wants to make a decent accurate bench power supply.
first i will tell you what he wants then what he has and finaly what budget his tight arse dad has let him have
he wants a 3-4 outlet variable supply that can be current limited, voltage range -12 to +25v DC preferably 5A max but 3A if we cant get to 5, he wants it as stable and noise free as he can get and would like it accurate to 3 decimal places! again if we can. he also wants 3 fixed outputs of the following 3.3v 5v 12v -5v -3.3v
his budget is only £30 but that isnt rigid if safety cost more, we also have a huge range of components, i have a fair few power boards from broken scopes and logic analyzer's and ATX psu's so i am hopeing there is a transformer on at least one we can use.
so first question is with the above in mind what would the best type of supply be to build?? (we can then google circuits for this) can we use more than one transformer connected together? what type and rating transformer should i be on the look out for on the boards we have?
any help would be great
i forgot to mention that a digital read out would be good and pot adjustment on one outlet with the other two or three digital set.
like i say i didnt just want to google and end up building a death trap!!
anyway it is now his thread
so the project!
he wanted a lab PSU for christmas but when i saw the price (£200+) i desided to spend it on something else for him, and he realy wants to make a decent accurate bench power supply.
first i will tell you what he wants then what he has and finaly what budget his tight arse dad has let him have
he wants a 3-4 outlet variable supply that can be current limited, voltage range -12 to +25v DC preferably 5A max but 3A if we cant get to 5, he wants it as stable and noise free as he can get and would like it accurate to 3 decimal places! again if we can. he also wants 3 fixed outputs of the following 3.3v 5v 12v -5v -3.3v
his budget is only £30 but that isnt rigid if safety cost more, we also have a huge range of components, i have a fair few power boards from broken scopes and logic analyzer's and ATX psu's so i am hopeing there is a transformer on at least one we can use.
so first question is with the above in mind what would the best type of supply be to build?? (we can then google circuits for this) can we use more than one transformer connected together? what type and rating transformer should i be on the look out for on the boards we have?
any help would be great
i forgot to mention that a digital read out would be good and pot adjustment on one outlet with the other two or three digital set.
like i say i didnt just want to google and end up building a death trap!!
anyway it is now his thread