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- Newsgroups: sci.electronics
- Path: sparky!uunet!sun-barr!cs.utexas.edu!zaphod.mps.ohio-state.edu!rpi!batcomputer!cornell!uw-beaver!fluke!gtisqr!toddi
- From: toddi@mav.com (Todd Inch)
- Subject: Re: Teeny-weeny Sony power connector?
- Message-ID: <1992Nov18.225817.27565@mav.com>
- Organization: Maverick International Inc.
- References: <1992Nov12.142427.25333@panix.com> <1992Nov13.143003.26580@keinstr.uucp>
- Distribution: usa
- Date: Wed, 18 Nov 92 22:58:17 GMT
- Lines: 44
-
- In article <1992Nov13.143003.26580@keinstr.uucp> chaplin@keinstr.uucp (Roger Chaplin) writes:
-
- > ------------
- > | |
- > | AC | ______ _____ _______
- > | Adaptor |---------------------| | --| |-------------| |
- > | | ------ ----- -------
- > | | 1/8" 1/8" original
- > ------------ stereo stereo AC Adaptor
- > in-line plug plug
- > jack
-
- >The reason I chose a 3-conductor (stereo) rather than a 2-conductor
- >(mono) connector is that for some stereos, the `ring' of the connector,
- >rather than the `tip', is the positive voltage connection. All of the
- >2-conductor plugs I've seen have exposed metal which is connected to
- >the ring. I didn't want any chance of shorting that conductor to the
- >grounded metal of the car's gear shift, etc.
-
- Looks like a great idea. But, since the 1/8" plug/jack is of arbitrary
- polarity, you could have made it always have a negative (or whatever your
- car frame ground is) ring and a positive tip in all cases - the tip of
- the 1/8" doesn't necessarily need to be the same polarity as the tip of
- the original plug.
-
- There are "universal" AC adapters on the market which have a four-way
- connectors on them that looks like | and sometimes has a 9V
- ___ --O--
- =| |__________/|
- |___|
- battery clip dangling as well. These often have switchable voltages
- and polarities. I THINK I may have seen the molded + plug/cord or
- an interchangeable-tip cord/plug without the actual power supply at
- Radio Shack.
-
- I do essentially the same thing as your 1/8" universal converter except
- I use a 1/4" mono plug/jack since (1) I can get more current through it
- to operate spotlights, compressors, etc, (2) It is more heavy-duty, less
- likely to break, especially if you buy studio-grade plugs/jacks, and (3)
- of course, at the time I had large quanitites of plugs which were donated
- to my high school and jacks which were donated to my college. The other
- big advantage is that you can buy off-the-shelf Y-splitters, extension
- cables, etc if you don't have time to make your own before that big road
- trip.
-