On Sunday, July 15, 2012, James Churchill wrote:
> Maybe something was wrong with your adapter? USB car adapters are all
> switching designs (considering I just claimed that they all use
> exactly the same chip, they pretty much have to be.)
> - James
> On 15 July 2012 12:54, Joel Byrnes <fatal.exception.occur...@gmail.com<javascript:;>>
> wrote:
> > Maybe. I got a really cheap 12v USB car adapter and it had a crappy
> regulator that would overheat and turn off, then cool and turn back on and
> repeat. So my phone kept making noises all the time.
> > Dropping 8.7V would get hot and be very wasteful. Maybe a switching reg
> would be better? More expensive though.
> > On 15/07/2012, at 11:49 AM, Triffid Hunter <triffid.hun...@gmail.com<javascript:;>>
> wrote:
> >> On Sun, Jul 15, 2012 at 11:27 AM, tjhowse <tjho...@gmail.com<javascript:;>>
> wrote:
> >>> I need to buy/built a 3.3v regulator circuit able to supply 300mA.
> I've got
> >>> a circuit bodged up with a big, chunky adjustable power supply package
> but
> >>> it gets quite hot. It will be running off a 12v ish lipo battery. Any
> >>> suggestions?
> >> get a usb car phone charger. it will have an MC34063 in it. just
> >> change the feedback resistors and you're golden :)
> >> can pick them up for around $10 at any auto store, kmart, big-W, JB
> >> hifi, dse, jaycar etc etc
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