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#1
February 27th 04, 04:02 PM
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5 volt DC power converters
Some time ago I noticed in a post a link to a DC/DC
converter IC. I'd like to investigate these and would appreciate a repost if possible. I have tried searching the archives but can't come up with the right search phrase or the post is older than I remember. Thanks, John 
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#2
February 27th 04, 04:25 PM
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Look at National Semiconductors site. ICs LM2756 and LM2754 depending
on your current draw. Also look at application notes that will come up. Henryk Birecki John Ferguson . co.uk wrote: Some time ago I noticed in a post a link to a DC/DC converter IC. I'd like to investigate these and would appreciate a repost if possible. I have tried searching the archives but can't come up with the right search phrase or the post is older than I remember. Thanks, John
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#3
February 27th 04, 06:23 PM
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Power Trends ( Now Texas instruments ) 78HT205HC
http://www.internationalsoaring.org/78hc205.pdf 10 - 32 volt in. Switching regulator very high efficiency up to 90% ( normal operation fully charged iPaq ) and up to 2 Ampere out - Will charge and run a completely flat iPaq with the backlight on! PS: I have a several tubes full of them if you want one or two ! Ian "John Ferguson" . co.uk wrote in message ... Some time ago I noticed in a post a link to a DC/DC converter IC. I'd like to investigate these and would appreciate a repost if possible. I have tried searching the archives but can't come up with the right search phrase or the post is older than I remember. Thanks, John
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#4
February 27th 04, 07:35 PM
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On Fri, 27 Feb 2004 18:23:26 +0000 (UTC), "tango4"
wrote: Power Trends ( Now Texas instruments ) 78HT205HC http://www.internationalsoaring.org/78hc205.pdf 10 - 32 volt in. Switching regulator very high efficiency up to 90% ( normal operation fully charged iPaq ) and up to 2 Ampere out - Will charge and run a completely flat iPaq with the backlight on! PS: I have a several tubes full of them if you want one or two ! Is that the tiny PCB I found in a Car lighter adapter cord for an IPAQ 3850? -- martin@ : Martin Gregorie gregorie : Harlow, UK demon : co : Zappa fan & glider pilot uk :
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#5
February 28th 04, 01:42 AM
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Could well be the same sort of thing - a small switching power supply - but
these are actually in a plastic housing. Ian "Martin Gregorie" wrote in message ... On Fri, 27 Feb 2004 18:23:26 +0000 (UTC), "tango4" wrote: Power Trends ( Now Texas instruments ) 78HT205HC http://www.internationalsoaring.org/78hc205.pdf 10 - 32 volt in. Switching regulator very high efficiency up to 90% ( normal operation fully charged iPaq ) and up to 2 Ampere out - Will charge and run a completely flat iPaq with the backlight on! PS: I have a several tubes full of them if you want one or two ! Is that the tiny PCB I found in a Car lighter adapter cord for an IPAQ 3850? -- martin@ : Martin Gregorie gregorie : Harlow, UK demon : co : Zappa fan & glider pilot uk :
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#6
February 28th 04, 04:44 AM
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You get an extra bonus with these converters, it happens on 123.0 123.3 and
123.5 and many other frequencies I would guess, especially on Becker Radios a loud squelch hiss sometime with the 2 second GPS pulse sometimes constant. Richard "tango4" wrote in message ... Power Trends ( Now Texas instruments ) 78HT205HC http://www.internationalsoaring.org/78hc205.pdf 10 - 32 volt in. Switching regulator very high efficiency up to 90% ( normal operation fully charged iPaq ) and up to 2 Ampere out - Will charge and run a completely flat iPaq with the backlight on! PS: I have a several tubes full of them if you want one or two ! Ian "John Ferguson" . co.uk wrote in message ... Some time ago I noticed in a post a link to a DC/DC converter IC. I'd like to investigate these and would appreciate a repost if possible. I have tried searching the archives but can't come up with the right search phrase or the post is older than I remember. Thanks, John
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#7
February 28th 04, 07:15 AM
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I have a Becker in the Ventus and i don't have a problem with it at all.
Ian "Richard Pfiffner" wrote in message ... You get an extra bonus with these converters, it happens on 123.0 123.3 and 123.5 and many other frequencies I would guess, especially on Becker Radios a loud squelch hiss sometime with the 2 second GPS pulse sometimes constant. Richard "tango4" wrote in message ... Power Trends ( Now Texas instruments ) 78HT205HC http://www.internationalsoaring.org/78hc205.pdf 10 - 32 volt in. Switching regulator very high efficiency up to 90% ( normal operation fully charged iPaq ) and up to 2 Ampere out - Will charge and run a completely flat iPaq with the backlight on! PS: I have a several tubes full of them if you want one or two ! Ian "John Ferguson" . co.uk wrote in message ... Some time ago I noticed in a post a link to a DC/DC converter IC. I'd like to investigate these and would appreciate a repost if possible. I have tried searching the archives but can't come up with the right search phrase or the post is older than I remember. Thanks, John
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