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varano_ohms

Watts -- Amplifier

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Hi,

I have a aiwa 40Wx4 radio connected to a 250W PSU with a 60W speaker

I would like to know which is a good amplifier where to put 2 speakers and a sub
and how much must be the power of the PSU

Thank you
Greetings

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Why don't you just start with a home theatre receiver in the first place instead of ghetto rigging a bunch of bullshit together?


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20 hours ago, THATpurpleKUSH said:

Why don't you just start with a home theatre receiver in the first place instead of ghetto rigging a bunch of bullshit together?

thanks for your help

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4 hours ago, varano_ohms said:

thanks for your help

Many options with bluetooth and aux input that will work way better than a cheap 20+ year old deck like that Aiwa. 

 

https://www.parts-express.com/cat/home-audio-amplifiers/106


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8 hours ago, varano_ohms said:

thanks for your help

dude, we almost talked this to death in the other thread. if you want to use a computer PSU, itll work just fine, you just need to be mindful of the amperes it output, not the wattage rating on the PSU. There are a lot of DIY videos on youtube on how to repurpose a PSU to use in a home 12v setup, but you need to go about it logically. A PSU outputs DC in a few different voltages. It then splits up the different voltages into smaller leads of varying amperages to feed specific components in a computer that are known to only ever need x amnt of amps at that specific voltage. Disregard everything that isnt 12 volts, put all the 12 volt leads together on one terminal which will "sum" the total amperage to whatever the individual amnts added together are. When doing this, make the leads coming FROM the PSU as short as possible as thin wires dont like carrying the maximum voltage and amperage theyre designed to do for extended periods of time. For the amount of amperage youre gonna get from a PSU, one of these should work fine. Do the same with the grounds on a different spot on the barrier strip and connect your amp to the respective +'s and -'s along with a remote turn on from the +12v side. If you get a big enough PSU, you might want some distro blocks, perhaps even one with built in fuses, as youre going to want to fuse it anyways. Beyond that, youre going to want to get an AC to DC converter which arent cheap. If youre just wanting music in your house, you really should look at a receiver for the mains and if you arent going to go with a home sub thats already powered, and want to use your car audio gear, then getting a PA amp for the bass is ideal. Such as this

 

are you just trying to not spend any money and make your old car gear work in your house? 99% of the time, when people ask about using a PSU on 12v stuff, its that, which is fine, i aint judgin man. I just need you to know that a tiny PSU like that just isnt gonna work for much of anything. My PSU i use for car audio gear testing puts out over 70 amperes and i only use it to see if car stuff turns on and will output music for testing purposes

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4 hours ago, THATpurpleKUSH said:

Many options with bluetooth and aux input that will work way better than a cheap 20+ year old deck like that Aiwa. 

 

https://www.parts-express.com/cat/home-audio-amplifiers/106

I assume it's like that
 I'm trying to do a DIY using old components

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32 minutes ago, youdoofus said:

dude, we almost talked this to death in the other thread. if you want to use a computer PSU, itll work just fine, you just need to be mindful of the amperes it output, not the wattage rating on the PSU. There are a lot of DIY videos on youtube on how to repurpose a PSU to use in a home 12v setup, but you need to go about it logically. A PSU outputs DC in a few different voltages. It then splits up the different voltages into smaller leads of varying amperages to feed specific components in a computer that are known to only ever need x amnt of amps at that specific voltage. Disregard everything that isnt 12 volts, put all the 12 volt leads together on one terminal which will "sum" the total amperage to whatever the individual amnts added together are. When doing this, make the leads coming FROM the PSU as short as possible as thin wires dont like carrying the maximum voltage and amperage theyre designed to do for extended periods of time. For the amount of amperage youre gonna get from a PSU, one of these should work fine. Do the same with the grounds on a different spot on the barrier strip and connect your amp to the respective +'s and -'s along with a remote turn on from the +12v side. If you get a big enough PSU, you might want some distro blocks, perhaps even one with built in fuses, as youre going to want to fuse it anyways. Beyond that, youre going to want to get an AC to DC converter which arent cheap. If youre just wanting music in your house, you really should look at a receiver for the mains and if you arent going to go with a home sub thats already powered, and want to use your car audio gear, then getting a PA amp for the bass is ideal. Such as this

 

Thank you
What would I need an AC-DC converter if the power supply does this already?
- How long should the cables be long if they are cut?
- given that there are 2 lines at 12 volts with different amperage and considering as hypothesis that they are only yellow cables, then connecting all the yellow cables you will get an amperage of 22 A enough to power a radio.
-so only a fuse would be enough?
-and anyway I imagine that a 250w power supply is not enough if you want to add an amplifier and a sub.

so I should cut all of the color diffrent to yellow (+ 12v) and black (ground) connecting all the yellow cables and all the black cables together
and at this point put a fuse on the yellow cable and a fuse on the black cable
correct?

 

 

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2 minutes ago, varano_ohms said:

Thank you
What would I need an AC-DC converter if the power supply does this already?

becaue the one you ave is insufficient to run what youre looking to run


- How long should the cables be long if they are cut?

a couple of inches. long enough to allow you to connect it and re-cut it if needs be, but not much longer than that


- given that there are 2 lines at 12 volts with different amperage and considering as hypothesis that they are only yellow cables, then connecting all the yellow cables you will get an amperage of 22 A enough to power a radio.

if you find the 8 amp and the 14 amp, yes they should sum to 22 amps


-so only a fuse would be enough?

yes

-and anyway I imagine that a 250w power supply is not enough if you want to add an amplifier and a sub.

the psu has nothing to do with the sub, just the amp. you could be running tower speakers off the amp connected to the psu and youd face the same issue

 

 

2 minutes ago, varano_ohms said:

so I should cut all of the color diffrent to yellow (+ 12v) and black (ground) connecting all the yellow cables and all the black cables together
and at this point put a fuse on the yellow cable and a fuse on the black cable
correct?

no need to fuse a ground

 

 

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Hi,

so if I understand correctly I have to cut the cables that I need a couple of inches and put a fuse on + 12V.

how much must the fuse be?

thanks

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4 hours ago, varano_ohms said:

Hi,

so if I understand correctly I have to cut the cables that I need a couple of inches and put a fuse on + 12V.

how much must the fuse be?

thanks

the fuse should be no more than what the PSU can output in the 12v leads youre using. in the scenario of the other thread, youll have a combined 22 amperes, so the psu, in theory, should never output more than that, so fusing higher then 22 amps isnt ideal. Conversely, the psu can fail spiking its output to something stupid high for a split second before it erupts like a volcano, which is enough to fry anything its connected to at the time of failure, so fusing right at its total amperage output is a great idea. Short answer is id put a 20 amp fuse on it or a 25 if youre feeling lucky

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ok understood

thanks

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