[plug] Mobile .mp3 results to date

[McMeikan, Andrew]

Hi,
	I was thinking of the linear way, and been playing with a switching
reg to keep the 12v up if the battery gets flat, any chance of a prelim
circuit description or cost estimate?  Your death toll is impressive, I
admire your determination if not your recklessness :)

	cya,	Andrew...

> -----Original Message-----
> From:	Brad Campbell [SMTP:brad at seme.com.au]
> Sent:	Tuesday, August 10, 1999 8:18 PM
> To:	plug at linux.org.au
> Subject:	[plug] Mobile .mp3 results to date
> 
> Just in case anyone may be interested, have some quick results on
> PC power consumption from the development of my 12 v PC PSU
> 
> The LOWEST consumption I managed to get was 1.68A while IDLE
> using a 2.0.35 Kernel. This was with an ASUS P55T2P4 HX Based
> board and an AMD K6 200 running at 166Mhz (Coz I couldn't be
> bothered re-jumpering the board after taking out the Cyrix M2)
> The AMD Draws about 3.5 amps until INIT boots up, then it 
> dropped down to about 2 amps. Then further to 1.6 while Idle.
> Average Consumption during a kernel compile was about 3.5 - 4
> amps.
> 
> This was at 13.8 v input.
> 
> The Cyrix M2 idled at about 3.5 amps lowest, tho it did compile
> the kernel faster :p)
> Average current for a compile was about 5.5-6 amps.
> 
> This was with Keyboard, Floppy Drive, Maxtor 850mb Hard Disk
> ISA Video Card and ISA Ne2000 Network card.
> The network was connected. Current increased by over 80ma with
> the network cable disconnected.
> 
> This works out about 7 amps at 5 volts.
> Anyway, based on these figures the linear regulator someone was
> going to use will be dissipating about 70 Watts..
> I guess your car would stay warm..
> 
> Our power supply is nearly finished.., well at least we have
> stopped blowing up FET's anyway..
> It uses readily available, off the shelf parts and is not to hard
> to build. The transformer winding is the tricky bit, but given 
> the longest winding is 7 turns, it's not to bad.
> Details will be available as soon as I can verify that I'm not going
> to fry any more Hard Disks..
> Death Toll so far.
> 
> One VX Motherboard
> 3 Hard Disks
> 14 HexFets..
> A handful of capacitors.. ( They are fun to blow up )
> 
> All in the name of mobile.. linux powered.. music..
> 
> On a final note, the lowest power I could get out of WIN95 while idle
> was about 4 amps.. ditto for DOS.
> Penguin Power
> 
> Brad....