It sounds the users are not really aware of 12 or 24 Vdc on the cigarette socket. They just used it by experience. Some better equipment are built to work on both voltages to help the users. Are those sockets always marked with output voltage and current like other electronics equipments?
Scott From: [email protected] [mailto:[email protected]] On Behalf Of Price, Edward Sent: Monday, January 19, 2009 11:07 PM To: [email protected] Subject: RE: Cigarette socket in vehicles ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Monday, January 19, 2009 6:37 AM To: Scott Xe Cc: [email protected] Subject: Re: Cigarette socket in vehicles Hello Scott, In the case of 12V accessories to plug in normally they have a regulator installed to prevent the overvoltage. Thank you. Rob Kado EMC Engineer - Module Laboratory Operations Chrysler Initial assumptions can be deceiving. I recently bought a Magellan GPS. It operates on 5 VDC, and came equipped with an external "cigarette socket" adapter. I assumed the cheapest, that there was a little resistor inside the adapter, or just possibly a cheap linear regulator. On taking the adapter apart (yes, I tend to do things like that), I was quite surprised to find a little 2 custom IC switching converter, with input inductors, filter capacitors and a hefty input overvoltage clamp. The input voltage range was not specified, but it seems likely to be capable of 24 VDC operation. Ed Price [email protected] <blocked::mailto:[email protected]> WB6WSN NARTE Certified EMC Engineer Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 Military & Avionics EMC Is Our Specialty - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]>
