| harmi11 |
Hi guys, got a question for you. I recently discovered my dad's old car stereo and its in working order. Panasonic H07MKII i think, but anyway since I dont have a car and I want to use this in my room, I thought about several ways of powering it but none have seemed rational. I kinda wanna know if its at all possible? and what would be the easiest way?
I like the portability of the car stereo and it doesnt sound too bad either (when it was in the car!) I dont want to blow my neighbours away or anything, just want to connect my 4ohm speakers to it and enjoy music in my room!!!
If you can help I would be really grateful!!
BTW: ALL the wires are cut at the back and I've identified the speaker wires but there's 3 other wires, RED, BLACK & BLUE. I'm not sure which ones are the power ones, any advice would be great! Thanks
Thanks
Harminder |
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| richie00boy |
Red = power +12V
Black = power 0V earth
Blue = output to drive remote electric aerial (i.e. just ignore and make sure it doesn't short out to anything)
As for powering the unit, best best is find a surplus transformer with a 10 volt winding rated at 6 amps at least, and add a rectifier and big fat smoothing cap, 15000uF at least. |
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| 30bandgeek |
if you are feeling a bit ghetto.
You could get a motorcycle 12v battery. and wire a small 12vdc transformer in parrellel to it to keep it charged. that shoud do the job.
what i mean bu transformer is just cut the end off a old nintendo power supply or equivlent. those put out about 3A that will power the deck easly and the small motercycle battery as a big buffer for power pull larger than the amperage arting.
if you are feeling cool you could get a SPDT relay and wire the transformer to the relay and have the remote turn on as a trigger to start charging the battery olny when the deck is turned on...
it is ghetto..but it will be safe and work... |
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| space |
I would opt for a PC PSU. Even older PSU's deliver 8A or more at 12V witch should suite your needs fine. If you are going with batteries remeber to get a closed cell variant that doesn't produce nasty gasses when charging.
space |
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| Jexx |
PC PSU's have a dirty output due to lack of sufficient caps, not to mention their fairly poor quality and lack of decent cooling...
I highly recommend a regulated 12V power supply. Best ones I've found for the price are Astron and Tenma.
All you would have to do is hook up the yellow battery positive(+) of the head unit to the positive (+) terminal of the power supply and the black ground(-) of the head unit to the negative(-) terminal of the power supply. Hook up the red ignition (+) of the head unit to the (+) of the power supply, but be sure there is a switch there to turn it on and off as a car does (if you leave the power supply on, since constant power is being provided to the battery positive, you won't lose your settings). |
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| harmi11 |
Thanks everyone for posting your answers, I think I'd wanna go for the 12V power supply, but I want to know in particular which ones can output 12v 5A which is what the head unit asks for. And if I was to use a PC PSU, how would I switch it on without it being connected to a motherboard since the huge connector isnt connected to anything and I couldnt get it to start. Thanks for your help!!
Harminder
I have attached a picture of the head unit. It is of the wires, speaker wires separate and power etc wires separate.
:) |
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| lndm |
| The older AT power supplies have a hard start (switch) rather than the soft start of the ATX supply. You'll find these in Pentiums and earlier. |
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| indoubt |
I've used an old AT PC powersupply to power a car head unit. I didn't expect too much of the sound quality because of the switching noise etc. but it worked remarkably well. Not as good as a regular linear powersupply though.
The older PC powersupplies need to see sufficient "load" so I put a resistor (cheap 17w wirewound) on the 5 volt load to prevent ot from switching of.
I also put a 25V 10000uF cap on the 12V to try to get rid of some of the ripple. Maybe it improved the sound, i did not listen critically before these mods which I made directly from the start. |
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| dangus |
| Most computer UPS units (uninteruptible power supply) under 1000 VA rating have a sealed lead-acid 12 volt battery inside, plus a charger. |
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| space |
I would say allmost all would be able to get hold of old/used PC PSU's for free...
It may be true that SQ might be and issue in a "higher grade" setup, but this does not seem to be such a setup imho.
space |
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| Jexx |
| A regulated power supply is leaps and bounds better than a PC power supply, you really have to own one to know the difference. But in this case, I agree, it doesn't matter too much considering it's not that nice of a setup anyway. |
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