Aboutcleggsan Expertise All technical areas of Electronics Engineering.
Experience BSEE, MBA, Design, R&D, University Research.
Senior Life Member of IEEE. Life Fellow of AES.
Organizations IEEE, Consumer Electronics Society, Audio Engineering Society.
Broad teaching experience; work experience mostly in consumer electronics and conversion from analog to digital technologies. Pioneer in digital audio at all levels.
Question QUESTION: hi halo my name is jesus an my question is. how can you built an electric converter ac to dc. 120 AC electricity into 18 volt DC. for a dewalt drill to act like a batteries pretty much like if you're trying to use a power from and outlet instead of of a batteries.
You can buy this type for $4.00 and up; a self contained power pod unit. It provides a 500ma output which is okey for small battery operated environments.
You didn't say what kind of current or power you need - which makes total difference about the design of the unit. Like the unit mentioned in the URL above, it is just a transformer with a diode at the secondary output. The dc is unfiltered but is okey for battery charging systems.
If you need filtered dc and some better regulation you will need a full-wave rectifier and ripple reduction filter to smooth out the dc, etc. Let me know more what you really need, electrically speaking - or the load that you are going to drive. Then with the power and current regulation qualities we can proceed with something more specific.
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QUESTION: hi halo this is jesus again. first thankyou for anwers me so fast thats something i considered but is not it, what I'm trying to do, is power my 18v dewalt drill with ac source. now the 18V DC 500 ma AC Adapter you refer me doesn't do the trick because the drill is an 18v 2.4 amp steady power.
like you says: i need a full-wave rectifier and ripple reduction filter to smooth out the dc, here is what i have in mine to use, and this is were i need yours advise. i can get a 25.2V CT 2.0A Transformer with Lead and need diodes to do the full wave, rectified and bridge the current. Then filtered with a capacitor to smooth the current and then regulatered to a minimum of 18v 2amp output voltage. question is...? 1st... 25v 2 amps transformer
2nd... What kind of Diode. for rectifiers
3rd... What kind of capacitors for smoothing
4th... what kind regulator to get at least the 18v 2.0 amps that i need?.. thats what i need!! and if is not too much to ask a diagram.
well thankyou very much for answer me back and i hope I'll get and answer for this big question. thankyou again.
Answer The reason power tools use battery power is due to the current surge required for loaded motor start. While it may be rated at 2 amps, the surge can go as high as 10 amps when first kicking on. So, I am not so sure that a transformer power supply will do the job. Also, you really don't need so much ripple reduction if you use a full wave rectifier. I would rather to recommend you to use a tested design that may be very suitable for what you want to do. See this:
In this design you will need a transformer with a secondary voltage of 15 or 18 volts ac. The rest of the parts can be as noted in the construction article. This design is good for 5 amps only if the power transformer is sufficient to provide it without too much drop.
And off you go. I repeat the warning, this low cost supply may not be sufficient to operate a drill motor as efficiently as would the batteries. But, give it a try.
