what voltage do you need?
I need power supply advices for my FitPc2. This little device consumes 8W at full CPU load and is 8-15 volts tolerant. I still don't want to feed it direct from battery. I am looking for some regulated DC-DC PSU with Auto Shutdown and startup controller but I couldn't find any good unit under 100$. I am thinking of powering my 7" Samsung LCD from the same PSU as well.
Also I am planning to use my smartphone(webOS) embedded in the car.(GPS tracking, wifi tethering, 3G, remote commands etc..) I was thinking of using cigarette lighter USB charger connected to the smartphone constantly but this may ruin the battery(5volt 1A) so I may want to use the PSU to feed the smartphone as well. Any advice are welcome.
what voltage do you need?
If it's 8-15V tolerant, it sounds like it's fit for automotive environments.
If worried about above 15V, maybe 317 type regulator or a zenor regulator or crowbar (fuse blowing) circuit (since it's under 1A).
If powering other stuff, then whatever suitable "mobile" PSU (others can suggest...)
12v-1A(8v~15v/10watt) for computer.
12v-2A(8v~20v/20watt) for LCD.
5v-50mA for smartphone usb charging.(I may use computer USB output but I want to hide smartphone independed from carpc setup)
OldSpark, i want to eliminate the spike and noise from the unregulated dc car battery voltage. Form factor, shutdown and startup abilities are welcome.
I assumed you wanted >15V protection long term.
But as I said, if you are powering the other stuff as well, then you'll need a bigger 5V converter.
As to noise, check that AFTER installation. dc-dc converters can introduce their own noise and AFAIK they rarely transfer source +12V through to the output.
i believe the dc-dc usb power supply, as well as the carnetix series allow for this. i think both the carnetix models have adjustable outputs and a 5v line.
though, it might be better to use a separate 5v adapter for your other needs.
DC-DC-USB is killer for "external" automotive power regulation
i've had great success with those
tough part is wiring the power switch to your system. That'll require some fabrication.
If what you need is DC regulation and clean 12v power output, DC-DC-USB will do the trick.
I bought DCDC USB PSU and doing some tests before putting down all the things.
It works good right now. When the IGN voltage applied it goes ON and power up my PC and it goes OFF when the IGN is OFF. OK.
the problem is hibernate mode. I have already selected from Windows XP power settings "When power button pressed" do Hibernate. In every cycle my pc starts from a fresh startup. I couldn't understand yet why it starts from fresh. Just looking though!
It sounds like the PC doesn't enter hibernation before the power is removed. Have you checked the Windows event viewer yet?
1999 Mercury Grand Marquis GS with: ASRock E350M1 w/4GB RAM, 80GB Intel SSD, Opus DCX3.120, Visteon HD Radio + HDR-USB, PL-18N wifi, OBDLink Scan Tool, BTA6210 BT, BU-353, Win 7 Ultimate, CF 4.0, Alpine MRP-F240 + MRP-T220, RF Punch 1572s, Kicker 8" Comp.
I think so. It seems it is related with Windows XP.
Even I press the Power button manually it shuts down immediately before going into hibernation mode.
I will check event viewer now