Car stereo cheap alternative to big hifi systems - Page 2

li_gangyi · 4th October 2003, 04:18 AM

Cummon man...a crummy 1A wun kick it..especially for bass...you need at least 20A or something bigger...seend as much as 100A being used...

Matttcattt · 5th October 2003, 08:04 PM

Quote:

Originally posted by li_gangyi
Cummon man...a crummy 1A wun kick it..especially for bass...you need at least 20A or something bigger...seend as much as 100A being used...

Rod elliot said his power supply should be able to go up to 500A with enough output devices.

Cool :P

li_gangyi · 6th October 2003, 06:53 AM

Yeah...and if anyone needs 3055s..gimmi a mail or a PM...I got a few here...

jake · 6th October 2003, 08:33 AM

why not get an electriction to wire it into your electricity (i.e. wire it into the mains). It shouldnt cost that much really (maybe it does?). just a thought.

____
Jake
____

Jennice · 6th October 2003, 08:49 AM

Hi Jake,

I don't know about your local laws, but here in DK you won't be able to have anyone legally install 12V along with the "ordinary" power line.

Apart from legal issues, it's pointless to make the 12V gneration as part of the house's electrical sytem. The long leads from source to appliance will create immense losses (and be terrible inductances, considering that a lot of car stereo equipment has SMPSU's built in. (especially the power-amp's)

Generally, you will need to be carefull if you use a PC PSU. It can indeed deliver a lot of current (although some types have the most juice at 5V), but powering a SMPS from a SMPS can (in worst case) lead to faults in one or both components, mainly during turn-on and turn-off.
During turn-on, some car power amps draw VERY high peak currents, which may stress or damage your PC PSU.
During turn-off, your PC PSU may have temporary states of high output impedance. The SMPS of a car power amp may not protect against (negative) voltage transients emmitting from the SMPS to the PC PSU. At work I had this problem, where one SMPS fried another one during certain power-down conditions.

Jennice

li_gangyi · 6th October 2003, 08:59 AM

I have tried shorting a PC smpsu...it will just shut itself off...in worst case senarios...the fuse should be adequate to protect you...if you are feeling unsafe...build a BIG linear PSU~!!!

jake · 7th October 2003, 07:48 AM

hey guys

car cigarette lighters only provide either around 20A or 60A (I can t remember 4 sure) This is all the stereos are wirred to.

_____
Jake
_____

uvodee · 7th October 2003, 08:58 AM

Back in the very early 90' s I had fitting transformers installed in the distribution box while still living in Belgium These transfo's took 220 volt AC down to 12 v DC.

I did this in order to install the then very popular 12 volt halogen lighting. it took away the wall warts and even ceiling warts......

worked just fine and installing it was a piece of cake.

purplepeople · 7th October 2003, 09:19 AM

Hey, how about those big halogen light wall warts. They give out 12VAC and 6A. Shouldn't that be enough for a GC monoblock. You could go to IKEA, get the cheapest tracklight for the transformer, throw the hardware in the future use pile, and still have 3 spare bulbs for your current tracklights.

With two of them, each one DC'ed with a bridge into a 317/337 or 78xx/79xx to get a just under +/-12VDC supply?

:)ensen.

jake · 9th October 2003, 07:54 AM

is it just me or are ppl in this forum talking about garden lighting. guys, dont fill this room with rubbish, weve already established that we needj around 20-100 AMPs.

____
Jake
____

4th October 2003, 04:18 AM	#11
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	Cummon man...a crummy 1A wun kick it..especially for bass...you need at least 20A or something bigger...seend as much as 100A being used... __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

6th October 2003, 06:53 AM	#13
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	Yeah...and if anyone needs 3055s..gimmi a mail or a PM...I got a few here... __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

6th October 2003, 08:49 AM	#15
Jennice diyAudio Member Join Date: Jun 2003 Location: Planet Earth	12 in house? Hi Jake, I don't know about your local laws, but here in DK you won't be able to have anyone legally install 12V along with the "ordinary" power line. Apart from legal issues, it's pointless to make the 12V gneration as part of the house's electrical sytem. The long leads from source to appliance will create immense losses (and be terrible inductances, considering that a lot of car stereo equipment has SMPSU's built in. (especially the power-amp's) Generally, you will need to be carefull if you use a PC PSU. It can indeed deliver a lot of current (although some types have the most juice at 5V), but powering a SMPS from a SMPS can (in worst case) lead to faults in one or both components, mainly during turn-on and turn-off. During turn-on, some car power amps draw VERY high peak currents, which may stress or damage your PC PSU. During turn-off, your PC PSU may have temporary states of high output impedance. The SMPS of a car power amp may not protect against (negative) voltage transients emmitting from the SMPS to the PC PSU. At work I had this problem, where one SMPS fried another one during certain power-down conditions. Jennice __________________ I get paid to break stuff. My g/f gets paid to play with children. Life is good.

6th October 2003, 08:59 AM	#16
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	I have tried shorting a PC smpsu...it will just shut itself off...in worst case senarios...the fuse should be adequate to protect you...if you are feeling unsafe...build a BIG linear PSU~!!! __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

7th October 2003, 08:58 AM	#18
uvodee diyAudio Member Join Date: Aug 2002 Location: Washington	interesting Back in the very early 90' s I had fitting transformers installed in the distribution box while still living in Belgium These transfo's took 220 volt AC down to 12 v DC. I did this in order to install the then very popular 12 volt halogen lighting. it took away the wall warts and even ceiling warts...... worked just fine and installing it was a piece of cake.


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6th October 2003, 08:33 AM	#14
jake diyAudio Member Join Date: Aug 2003 Location: Brisbane, Australia	why not get an electriction to wire it into your electricity (i.e. wire it into the mains). It shouldnt cost that much really (maybe it does?). just a thought. ____ Jake ____

7th October 2003, 07:48 AM	#17
jake diyAudio Member Join Date: Aug 2003 Location: Brisbane, Australia	hey guys car cigarette lighters only provide either around 20A or 60A (I can t remember 4 sure) This is all the stereos are wirred to. _____ Jake _____

7th October 2003, 09:19 AM	#19
purplepeople diyAudio Member Join Date: Mar 2003 Location: London, Ontario, Canada	Hey, how about those big halogen light wall warts. They give out 12VAC and 6A. Shouldn't that be enough for a GC monoblock. You could go to IKEA, get the cheapest tracklight for the transformer, throw the hardware in the future use pile, and still have 3 spare bulbs for your current tracklights. With two of them, each one DC'ed with a bridge into a 317/337 or 78xx/79xx to get a just under +/-12VDC supply? :)ensen. __________________ Those who claim to be making history are often the same ones repeating it.

9th October 2003, 07:54 AM	#20
jake diyAudio Member Join Date: Aug 2003 Location: Brisbane, Australia	is it just me or are ppl in this forum talking about garden lighting. guys, dont fill this room with rubbish, weve already established that we needj around 20-100 AMPs. ____ Jake ____

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