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Stereo backpack electrical conversion

J

Josh

Jan 1, 1970
0
Hi,

I am building a "stereo in a backpack" and need help with converting
power the easiest and cheapest way i can.
I found a small amp with 3 speakers hooked up that runs off of ac
voltage.
the transformer is converting the household current down to 12volt ac.

I had an idea of running this setup off of an rc car battery pack -
which is 9.6 volts

What do you think? Thanks
 
H

Homer J Simpson

Jan 1, 1970
0
the transformer is converting the household current down to 12volt ac.

And that in turn is converted to DC. What voltage?
 
E

Eeyore

Jan 1, 1970
0
Josh said:
I am building a "stereo in a backpack" and need help with converting
power the easiest and cheapest way i can.
I found a small amp with 3 speakers hooked up that runs off of ac
voltage.
the transformer is converting the household current down to 12volt ac.

I had an idea of running this setup off of an rc car battery pack -
which is 9.6 volts

What do you think? Thanks

Rectified 12V AC is a lot more than 9.6 volts but if you don't need that much
power you don't need the higher voltage.

I assume you want long battery life ? Check out Class D amplifier chips. They
are significantly more efficient.

Graham
 
J

Josh

Jan 1, 1970
0
And that in turn is converted to DC. What voltage?

it is not converted to dc as far as i know.
the transformer is just changing 120vac household down to 12 volts ac.
 
H

Homer J Simpson

Jan 1, 1970
0
it is not converted to dc as far as i know.
the transformer is just changing 120vac household down to 12 volts ac.

Transistors don't run off AC.
 
Hi,

I am building a "stereo in a backpack" and need help with converting
power the easiest and cheapest way i can.
I found a small amp with 3 speakers hooked up that runs off of ac
voltage.
the transformer is converting the household current down to 12volt ac.

I had an idea of running this setup off of an rc car battery pack -
which is 9.6 volts

What do you think? Thanks

And the "playing time" is?

There is probably nothing cheaper than getting a car stereo power amp
and using 12V. Use a gel cell instead of the rc car battery.
 
M

martin griffith

Jan 1, 1970
0
Hi,

I am building a "stereo in a backpack" and need help with converting
power the easiest and cheapest way i can.
I found a small amp with 3 speakers hooked up that runs off of ac
voltage.
the transformer is converting the household current down to 12volt ac.

I had an idea of running this setup off of an rc car battery pack -
which is 9.6 volts

What do you think? Thanks


USE FUCKING HEADPHONES, stop polluting my space with your noise


martin
 
J

Josh

Jan 1, 1970
0
USE FUCKING HEADPHONES, stop polluting my space with your noise

martin

Excuse me but i never said i was using this in public - im looking for
help on electricity not on what your enraged opinions are.
 
J

Josh

Jan 1, 1970
0
And the "playing time" is?

There is probably nothing cheaper than getting a car stereo power amp
and using 12V. Use a gel cell instead of the rc car battery.

Hi, I am not using a car stereo - it is an ac powered amplifier device
bassically for a computer. I need to fit this in a backpack that can
be carried around easily - so the lightest, the better. thanks for
your help though. Maybe you would know of arechargeable source of ac??
im just trying to use what i have around my house.
 
J

Josh

Jan 1, 1970
0
Transistors don't run off AC.

It is a transformer, not a transistor - i am just trying to run a
small computer speaker amplifier, off of a rechargeable source of
energy. Thanks
 
J

Josh

Jan 1, 1970
0
Rectified 12V AC is a lot more than 9.6 volts but if you don't need that much
power you don't need the higher voltage.

I assume you want long battery life ? Check out Class D amplifier chips. They
are significantly more efficient.

Graham

That is a good idea - unfortunately i dont have the money to buy/build/
put together that sort of stuff. I'm just trying to see how i can use
stuff around the house. Thanks for the suggestion though - i might use
that idea later on. :)
 
H

Homer J Simpson

Jan 1, 1970
0
It is a transformer, not a transistor - i am just trying to run a
small computer speaker amplifier, off of a rechargeable source of
energy. Thanks

You don't have a clue. You really can't do what you think you want to.
 
P

Peter Bennett

Jan 1, 1970
0
it is not converted to dc as far as i know.
the transformer is just changing 120vac household down to 12 volts ac.

Homer is asking what DC voltage is actually used inside the amplifier.

The 12 volt AC will be converted to DC in the power supply section of
the amplifier. The thought is that it may be easier to produce the
required DC voltages (and bypass the internal rectifiers) than trying
to create 12 VAC.


--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
new newsgroup users info : http://vancouver-webpages.com/nnq
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
 
J

Josh

Jan 1, 1970
0
Homer is asking what DC voltage is actually used inside the amplifier.

The 12 volt AC will be converted to DC in the power supply section of
the amplifier. The thought is that it may be easier to produce the
required DC voltages (and bypass the internal rectifiers) than trying
to create 12 VAC.

--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
new newsgroup users info :http://vancouver-webpages.com/nnq
GPS and NMEA info:http://vancouver-webpages.com/peter
Vancouver Power Squadron:http://vancouver.powersquadron.ca


I dont understand how that would work when the whole amplifier system
runs off of AC. The transformer is only stepping down the voltage/
amperage, it is not converting the current. That is what i am trying
to do - change the current input from ac to dc source.
 
J

Josh

Jan 1, 1970
0
I dont understand how that would work when the whole amplifier system
runs off of AC. The transformer is only stepping down the voltage/
amperage, it is not converting the current. That is what i am trying
to do - change the current input from ac to dc source.- Hide quoted text -

- Show quoted text -


And also - this is not an impossible task. I already know how to do
this - but it is too expensive, i am looking for the alternative
methods out there that people may have messed around with before or
came up with.
 
Hi, I am not using a car stereo - it is an ac powered amplifier device
bassically for a computer. I need to fit this in a backpack that can
be carried around easily - so the lightest, the better. thanks for
your help though. Maybe you would know of arechargeable source of ac??
im just trying to use what i have around my house.

A car stereo amp can be used as any general purpose amplifier. I try
to find turn key solutions before designing my own circuits.

I don't see why you would want an AC powered device if you are trying
to be portable. With an inverter, the quality of the AC is terrible. A
cheap car amp would do the trick.

To really get an intelligent answer, you need to be very specific.
What is the play time? What power output? THD?
 
J

Josh

Jan 1, 1970
0
A car stereo amp can be used as any general purpose amplifier. I try
to find turn key solutions before designing my own circuits.

I don't see why you would want an AC powered device if you are trying
to be portable. With an inverter, the quality of the AC is terrible. A
cheap car amp would do the trick.

To really get an intelligent answer, you need to be very specific.
What is the play time? What power output? THD?- Hide quoted text -

- Show quoted text -

you have a good point about the quality. I suppose a car amp would be
very cost effective, then im not stuck with a cheap pc amp, and
speakers.
and also i can use better quality speakers that i have laying around.
Thanks for the great idea!!!!


That is all the help i need
 
E

Eeyore

Jan 1, 1970
0
Josh said:
Maybe you would know of arechargeable source of ac??

There is no such thing.

Electronics runs on DC. Your amplifier contains a rectifier to convert the ac
input to dc. Run the amplifier on dc and you don't need the rectifier.

Graham
 
E

Eeyore

Jan 1, 1970
0
Josh said:
It is a transformer, not a transistor

He knows. You simply missed the point he was making.

- i am just trying to run a
small computer speaker amplifier, off of a rechargeable source of
energy. Thanks

You should really be asking in the basics group in that case, not design. This
isn't a design issue.

Graham
 
J

Josh

Jan 1, 1970
0
He knows. You simply missed the point he was making.


You should really be asking in the basics group in that case, not design. This
isn't a design issue.

Graham

You know what - it is not posssible to just bypass the rectifier and
hook in a dc source of power - i correctly wired it all and fried my
battery. You guys just don't understand what i was trying to tell you
- yes i understand electronics run off of dc - so why didnt you just
tell me where to hook in the dc supply on the circuit board? i dont
know the brand of it and dont know the power. it just is configured in
a cube shaped chair and has 2 speakers and 1 subwoofer hard wired to
the circuit board with an on/off switch, volume knob, and bass knob.
And this can be under the design section - but no one wants to fully
read and understand the posts one step at a time


Don't bother replying because im done here - thanks for the people who
actually tried to understand and did help.
 
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