so, a couple years ago, i stabbed together a 15a bench supply, the transformer from a battery charger with a bad charge/sense circuit. i hid it nicely in a vintage "powermite" charger and converted to full bridge, which gave 17v+ on tap, long story-short, i got it all squared out and functional bench candy, but it's time to move up to the next step. now, before you go and tell me to use the search function, i've been hitting at it for a couple days, pouring through posts for days, and not coming up with what i need, thanks.
so, here's what i am looking to do:
i work on/test a variety of things, from car audio, to 2-way, rarely i may need a 24v supply, but i can do that via series battery, if needed.
i have, currently, 3x 10a astron(?) power supplies that have seen water, so i need to tear into them to evaluate condition, at least there will be the transformers i can use. next, a big transformer from a 40/160 charger, i may, or may not modify slightly for the times i need 1kw@12/14v
i also have a 2farad, and a 20farad cap, which i was intending on using for filter/dampening both sides, well, at least 20 on the output side and the 2 on the supply i'm currently using, as it has a pretty bad ripple by itself, lol.
as for the "module" itself, i have an old targa "340" amp casing to cannibalize, and plan on using a 5" fan, or 2. i also, would like to utilize an accidental order i made of 16 irfp054n fets. they are 81a each, so that should be more than plenty to do the job, lol.... as far as other devices on-hand, i just did a quick inventory and picked a few that i could use:
-sg3525an. hoping to utilize this one, with it's many features as the main control. i actually have 3, but i'm pretty sure at least one is spoken for.
-mc14018bcpg. ic counter n-preset. iirc, up to 10 sequential outputs. i have2
-tc4427epa. ic mosfet driver dual h.s. 1.5a. i have 10.
-bd139/bd140. 25 each. common mosfet drivers.
-lm317t/lm377sp. 10 each. common regulators.
-c4467/a1694. i have a few, they are used bjt's, and not going into anything, really.
-irfp054n, of course. i have 16.
-irfz44n. a small pile used, i still have to test individually. again, not gonna be going into anything, just thinking maybe easier to use for the light loads.
what i was thinking, was to use output a of the 3525, and feed the counter, which each odd output will drive it's own fet, and the evens will sum/combine to a driver that will run, say, 4-054's parallel for the larger current feed. (it may not work out that way, as i'm trying to remember from studying the counter last year, lol. may not be able to skip individual counts, rather just reset to one from chosen end) we'll call this the "section 1"
i would put output b of the 3525 to a toggle switch that will switch between feeding a (designed to operate like this) and another, larger drive section, with the remaining 054's. this can be in it's own external sink, as would likely need to be, should i ever power it to full, lol. we'll call it "section 2"
i would ideally like each feed to be self-triggering as active/on when voltage is present, but i can do a toggle switch to each, too. i would also like to add a thermal shut-down, utilize the under-voltage feature, and a selectable current limiter. oh, yah, real important: i want it to be adjustable voltage, lol. i need to turn-in for now, but i have been toying with this for quite some time, and finally want to pull the trigger. if you could help design it, that would be great, as i have some time, but not a huge amount.
thank salot,
-Heath H-
so, here's what i am looking to do:
i work on/test a variety of things, from car audio, to 2-way, rarely i may need a 24v supply, but i can do that via series battery, if needed.
i have, currently, 3x 10a astron(?) power supplies that have seen water, so i need to tear into them to evaluate condition, at least there will be the transformers i can use. next, a big transformer from a 40/160 charger, i may, or may not modify slightly for the times i need 1kw@12/14v
i also have a 2farad, and a 20farad cap, which i was intending on using for filter/dampening both sides, well, at least 20 on the output side and the 2 on the supply i'm currently using, as it has a pretty bad ripple by itself, lol.
as for the "module" itself, i have an old targa "340" amp casing to cannibalize, and plan on using a 5" fan, or 2. i also, would like to utilize an accidental order i made of 16 irfp054n fets. they are 81a each, so that should be more than plenty to do the job, lol.... as far as other devices on-hand, i just did a quick inventory and picked a few that i could use:
-sg3525an. hoping to utilize this one, with it's many features as the main control. i actually have 3, but i'm pretty sure at least one is spoken for.
-mc14018bcpg. ic counter n-preset. iirc, up to 10 sequential outputs. i have2
-tc4427epa. ic mosfet driver dual h.s. 1.5a. i have 10.
-bd139/bd140. 25 each. common mosfet drivers.
-lm317t/lm377sp. 10 each. common regulators.
-c4467/a1694. i have a few, they are used bjt's, and not going into anything, really.
-irfp054n, of course. i have 16.
-irfz44n. a small pile used, i still have to test individually. again, not gonna be going into anything, just thinking maybe easier to use for the light loads.
what i was thinking, was to use output a of the 3525, and feed the counter, which each odd output will drive it's own fet, and the evens will sum/combine to a driver that will run, say, 4-054's parallel for the larger current feed. (it may not work out that way, as i'm trying to remember from studying the counter last year, lol. may not be able to skip individual counts, rather just reset to one from chosen end) we'll call this the "section 1"
i would put output b of the 3525 to a toggle switch that will switch between feeding a (designed to operate like this) and another, larger drive section, with the remaining 054's. this can be in it's own external sink, as would likely need to be, should i ever power it to full, lol. we'll call it "section 2"
i would ideally like each feed to be self-triggering as active/on when voltage is present, but i can do a toggle switch to each, too. i would also like to add a thermal shut-down, utilize the under-voltage feature, and a selectable current limiter. oh, yah, real important: i want it to be adjustable voltage, lol. i need to turn-in for now, but i have been toying with this for quite some time, and finally want to pull the trigger. if you could help design it, that would be great, as i have some time, but not a huge amount.
thank salot,
-Heath H-
AFAIK transformers are the worst for wear on water damage, the other parts might be more salvageable.
Batt charger transformers are usually pretty horrible by quality standards by might be OK if you can mount them and get them quiet.
car audio aftermarket multifarad caps are NOT designed for constant smoothing duty. YMMV
you could stack two adjustable linear PS in series, watch the current rating and use the lowest value.
good place to start Introductory Information on Astron power supplies
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