iws@rayssdb.UUCP (02/06/87)
I am looking for an easy circuit to build that will convert 117VAC to
DC so I can power: a 12 VDC negative ground car radio at home; a 9 VDC
transistor radio; a 6 VDC cassette player; other 3 VDC battery powered
toys. I would like to be able to use commonly available parts - Radio
Shack or mail order - that the converter would be switchable to provide
any of the voltages at the flick of a switch and it be small in size.
USEnet: ... {allegra, cbatt, cbosgd, cci632, gatech, ihnp4, linus,
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Ihor Slabicky MS 171 * Raytheon Company * Submarine Signal Division
P.O. Box 360 * Portsmouth, RI 02871-0360 * (401) 847-8000 ext. 5684
1234567890 !#$%^&*()_-+={[}]~`:;"'|\<,>.?/ 0987654321grr@cbmvax.UUCP (02/08/87)
In article <1495@rayssdb.RAY.COM> iws@rayssdb.RAY.COM (Ihor W. Slabicky) writes: >I am looking for an easy circuit to build that will convert 117VAC to >DC so I can power: a 12 VDC negative ground car radio at home; a 9 VDC >transistor radio; a 6 VDC cassette player; other 3 VDC battery powered >toys. I would like to be able to use commonly available parts - Radio >Shack or mail order - that the converter would be switchable to provide >any of the voltages at the flick of a switch and it be small in size. > Ihor Slabicky MS 171 * Raytheon Company * Submarine Signal Division While you are in Radio Shack, why don't you just buy some adapters? They make nice ones for powering car radios and CB's from the wall outlet. They also make a universal device for transistor radios and similar low powered things. Having one device that powers both high powered devices and low powered devices is not very practical in an economic sense. It's cheaper to sell devices suited to each general task... -- George Robbins - now working for, uucp: {ihnp4|seismo|rutgers}!cbmvax!grr but no way officially representing arpa: cbmvax!grr@seismo.css.GOV Commodore, Engineering Department fone: 215-431-9255 (only by moonlite)
psfales@ihlpl.UUCP (02/08/87)
> I am looking for an easy circuit to build that will convert 117VAC to > DC so I can power: a 12 VDC negative ground car radio at home; a 9 VDC > transistor radio; a 6 VDC cassette player; other 3 VDC battery powered > toys. I would like to be able to use commonly available parts - Radio > Shack or mail order - that the converter would be switchable to provide > any of the voltages at the flick of a switch and it be small in size. Radio Shack already sells a box that does exactly this, including a kit of common DC connectors. Switchable voltages are 1.5, 3, 4.5, 6, and 9 volts at up to 300 milliamps. You would be hard pressed to design something as small, cheap, and reliable, and safe (UL approved) as this for the $11.95 it costs. It is on page 78 of my 1987 catalog, part no 273-1650. -- Peter Fales UUCP: ...ihnp4!ihlpl!psfales work: (312) 979-7784 AT&T Information Systems, IW 1Z-243 1100 E. Warrenville Rd., IL 60566
pingguo@mhuxt.UUCP (02/10/87)
In article <1705@ihlpl.UUCP>, psfales@ihlpl.UUCP (Peter Fales) writes: > >> I am looking for an easy circuit to build that will convert 117VAC to DC > > Radio Shack already sells a box that does exactly this, including a kit > of common DC connectors. Switchable voltages are 1.5, 3, 4.5, 6, and 9 volts > at up to 300 milliamps. > > You would be hard pressed to design something as small, cheap, and reliable, > and safe (UL approved) as this for the $11.95 it costs. > I disagree. The Radio Shack model that I once bought to provide 3 volts for my walkman equivalent was not good enough. It wasn't a well REGULATED voltage source. That is, if you have 300mA going through the thing, you have a nice clean 3v, but my walkman wasn't using nearly that much current. Result: approx 4.4v! When I brought it back I showed the salesman and we proved by checking two others that it wasn't just one bad egg -- they all acted the same way. So I gave up looking and eventually made one of my own. I'll have to look through my old papers to see how I did it (that was about 3 years ago). -- Randy Pratt, AT&T Bell Laboratories ..!{allegra,ihnp4}!mhuxt!pingguo ["Harry Sullivan is an imbecile!!"]