 USB charging, Thinking about adding 5volts |
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| worn |
 Dec 9 2015, 07:39 PM
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#1
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Winner of the Utah Twisted Joint Award  Group: Members Posts: 3,560 Joined: 3-June 11 From: Madison, WI and North Bend WA Member No.: 13,152 Region Association: Upper MidWest 
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I got a bunch of USB sockets and voltage regulator ICs that will trim 12v to 5v, and thought it would be nice to wire in for charging phones etc. someone suggested that the ICs would fry due to transients. So I am wondering about wiring zener diodes as shunts across the feed and wanted to know what you thought. I am especially interested in voltage and wattage for the zener and perhaps resistance to limit current. Thanks!
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| stugray |
Dec 9 2015, 08:28 PM
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Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
What McMark said.
I just bought a female cigarette lighter socket at Radio Shack, wired it into the fuse panel under the dash, and plugged in one of those $5 cig lighter USB chargers. |
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| worn |
Dec 10 2015, 11:06 AM
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Winner of the Utah Twisted Joint Award Group: Members Posts: 3,560 Joined: 3-June 11 From: Madison, WI and North Bend WA Member No.: 13,152 Region Association: Upper MidWest
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QUOTE(stugray @ Dec 9 2015, 06:28 PM)  What McMark said. I just bought a female cigarette lighter socket at Radio Shack, wired it into the fuse panel under the dash, and plugged in one of those $5 cig lighter USB chargers. (IMG:style_emoticons/default/dry.gif) Hey, I tell everyone this is the place where all of the super-sharp EEs with 914s hang out. I bought a stick of Goldstar GL7805s, rated for at least an amp. I already have a couple bags of USB female outlets, and all the aluminum I need for heatsinks. Good to get going. BUT on another board I read about voltage transients blowing out the ICs. I want a neat install and don't want to have to redo this all the time. The other board comment suggested a Zener diode to short out transients. OK. Now I am out of my depth. I don't know breakdown voltage, wattage or whether to run a current limiting resistor. Also I don't remember where I saw the original idea - probably megasquirt surfing. My initial circuit is very simple, but maybe it should be improved? |
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Posts in this topic
worn USB charging Dec 9 2015, 07:39 PM
Mike Bellis
I got a bunch of USB sockets and voltage regulato... Dec 9 2015, 08:06 PM McMark Just buy a cigarette light USB, cut it open and ta... Dec 9 2015, 08:19 PM Steve How many do you need? My stereo has one in it and... Dec 10 2015, 11:10 AM GregAmy $8 shipped.
http://www.amazon.com/Outlet-Cha... Dec 10 2015, 11:24 AM
worn
$8 shipped.
http://www.amazon.com/Outlet-Ch... Dec 10 2015, 11:47 AM
Steve Pratel
$8 shipped.
http://www.amazon.com/Outlet-Ch... Dec 11 2015, 08:55 AM stugray The 7805 should work fine in this car as long as y... Dec 10 2015, 12:51 PM worn
The 7805 should work fine in this car as long as ... Dec 10 2015, 01:54 PM stugray The audiophiles THINK the ultra capacitors help th... Dec 10 2015, 03:52 PM Spoke The ready-to-go solutions noted are the easiest wa... Dec 11 2015, 12:07 PM stugray
The Ultra caps should only be used to provide ins... Dec 11 2015, 03:43 PM Spoke
The Ultra caps should only be used to provide in... Dec 11 2015, 03:56 PM Mark Henry If you're willing to wait a month on shipping,... Dec 12 2015, 12:32 AM worn
If you're willing to wait a month on shipping... Dec 16 2015, 01:18 PM |
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