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Date: Sun, 15 Jul 2012 12:57:17 +1000
Message-ID: <CAN9H+Dxh8-kt5suZbwRQK+25u8DzJv6prF53Z75f5W7YTfm...@mail.gmail.com>
Subject: Re: 3.3v 300mA power supply.
From: James Churchill <pel...@gmail.com>
To: hackerspace_brisbane@googlegroups.com
Content-Type: text/plain; charset=ISO-8859-1

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> 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> wrote:
>
>> On Sun, Jul 15, 2012 at 11:27 AM, tjhowse <tjho...@gmail.com> 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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