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    variable DC power supply

    i'll be purchasing 2 of each components, maybe i'll 1.) build a second output or 2.) maybe i'll find a way to increase amperage (wherein past a level, the voltage has to start going down, or increase voltage (wherein past a level, the current has to start going down)... there is only as much...
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    a site that post different components but functionally are almost identical

    maximum reverse [voltage]. sorry, typo.
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    a site that post different components but functionally are almost identical

    about the need 1N400x's i found out that i had one that i salvaged. - at the time of this reply i already have and saw the maximum reverse currents.
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    a site that post different components but functionally are almost identical

    it can't be that there is no such site...
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    a site that post different components but functionally are almost identical

    so i need 4 1N4004 diodes but all i got are 1N4002, 1N4005 or 1N4007's, would they do? so, just to expand the question are there any site that post comparatively different electrical components, but are electrically (functionally) almost identical that in most situation, they can be...
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    variable DC power supply

    i just like pushing the envelope, even if i hardly know anything about the theory (software, not hardware, really is my specialization). alright, i'll be building your ver 2... i'd like to have 2 different outputs, with that, i suppose that you can always share the rectifier. but, i was...
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    variable DC power supply

    btw, why isn't a PMIC (Power Management IC) a better solution other than using the more complex designs found on the web that doesn't use PMIC? is it heat dissipation, lower ripples, better control, what?
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    variable DC power supply

    i've always wanted a variable power supply; not just for testing... possibly powering my other projects, some of the electrochemistry that i dabble with, charging my lipo and lead acid batteries, etc, etc... problem is, good ones are in the $90-$150 range (even on ebay) and the cheap-ass as i...
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    timer to trigger latch

    i wasn't sarcastic when i said that. anyways this discussion's gone too long than it need be. locking it now.
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    timer to trigger latch

    yep just looked the little bugger up... it's tiny. but, i don't want to add another task in my to do list, that is, to learn to program PICs... and i don't have a PIC programmer  ???. i also have no experience at all to wiring microcontrollers.. (i'm not even that sure as to what pull-up...
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    timer to trigger latch

    well, you can start thanking me by saying as to what components can i use for mystery components 1 and 2?? no, seriously i don't know.  ???
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    heavy duty, realiable dc power supply

    yeah, but what about using more expensive components??.... see i'm using this to play around with electrolysis (when i get too impatient, i remove the resistor on the electrode, and since it's a very ionic solution, the current definitely goes beyond 2A). so, i've broken 3 scavenged wall warts...
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    timer to trigger latch

    last, last, last question... what possible component could i use for unknowns 1 and 2 in my updated design?? preferably an FET
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    heavy duty, realiable dc power supply

    i see... right now, power efficiency is just a plus, it's not like i'm gonna leave it for hours and hours on end. if heat dissipation is really an issue, a better solution (than having a big-ass common heat sink) probably would be to add more redundant components to distribute the load.... or...
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    heavy duty, realiable dc power supply

    i see... is that project based on switching-mode? and in general, would power supplies based on switching-mode deliver higher current and even better voltage range?
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    heavy duty, realiable dc power supply

    crap. bunch of liars, they are. i can just go with this: http://electronics-lab.com/projects/power/001/index.html but 3A MIGHT NOT BE ENOUGH.... can we tweak it a bit or make improvements in the design so that it can reach around 6A?? bit too much to ask.. but is it even possible? if heat...
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    heavy duty, realiable dc power supply

    i see... what about this one: http://www.eleccircuit.com/power-supply-regulatable-0-28v-20amp-by-lm317-and-2n3055/
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    heavy duty, realiable dc power supply

    been scouring the web for a good diy dc power supply that can power a lot of my experiments. so this is the what i settled on: http://www.eleccircuit.com/high-power-supply-regulater-0-30v-20a-by-lm338/ so, does anyone else know of a better design?? i really don't have the knowledge to analyze...
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    timer to trigger latch

    unfortunately, money is an issue and buying that $150 thing is too much of a luxury. and, no, i have not spent weeks coming up with these things -- though saying that might not be a good thing, as it automatically suggests that. it's what i read-on and scour the web (for parts) when i'm bored...
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    timer to trigger latch

    can't find a proper latching switch that goes to being open after the power has been cut-off (reset?). so i changed the design on parts that i can easily obtain. i'm not really sure with it. i have these 2 unknown component that are lock-off devices -- if current goes to the gates, it OPENS...
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