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160 watt audio system from 1997

Sa1tama
By Sa1tama
in Audio
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Posted

Hi! I just found a stereo system from 1997. Honestly i could never imagine that i had it. I have 2x80watt bookshelf and 2x7.5watt mini spekers and i can't wait to build a circuit to drive it. The problem is that i don't know at what voltage i should plug it into. I couldn't find any datasheets for them (i'm talking about bookshelf speakers). On the back of the unit there is written: Power Handling Capacity 80 watts

Impedance: 6 ohms

 With this info i calculated that i need 21.9volts & 3.65amps. 

I am not a professional so naturally i came to LTT forum for answers.

Here are the pics:

15442669132541174167523.thumb.jpg.8994a9e030dd09ccfabb471288cd8434.jpg

 

1544266994955137079844.thumb.jpg.338bc47b1be51cc6b577dc526c1bb28a.jpg

 

Sorry for bad English and thanks in advance!

 

 

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Posted

probably passive speakers that just go to an amp? should just have two wires running out the back or two terminals for speaker wires to screw into

I spent $2500 on building my PC and all i do with it is play no games atm & watch anime at 1080p(finally) watch YT and write essays...  nothing, it just sits there collecting dust...

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The original LAN PC build log! (Old, dead and replaced by The Toaster Project & 5.0)

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"Here is some advice that might have gotten lost somewhere along the way in your life. 

 

#1. Treat others as you would like to be treated.

#2. It's best to keep your mouth shut; and appear to be stupid, rather than open it and remove all doubt.

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Just now, Bananasplit_00 said:

probably passive speakers that just go to an amp? should just have two wires running out the back or two terminals for speaker wires to screw into

Yep.

15442673814122067829342.thumb.jpg.95ebaac6f3d5a4c1c18929eb811fa730.jpg

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1 minute ago, _SAITAMA_ said:

Yep.

 

then just plug them into an amp, if you want to DIY an amp to drive them i cant really help with whats a good design but there should be plans all over the web

I spent $2500 on building my PC and all i do with it is play no games atm & watch anime at 1080p(finally) watch YT and write essays...  nothing, it just sits there collecting dust...

Builds:

The Toaster Project! Northern Bee!

 

The original LAN PC build log! (Old, dead and replaced by The Toaster Project & 5.0)

Spoiler

"Here is some advice that might have gotten lost somewhere along the way in your life. 

 

#1. Treat others as you would like to be treated.

#2. It's best to keep your mouth shut; and appear to be stupid, rather than open it and remove all doubt.

#3. There is nothing "wrong" with being wrong. Learning from a mistake can be more valuable than not making one in the first place.

 

Follow these simple rules in life, and I promise you, things magically get easier. " - MageTank 31-10-2016

 

 

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Posted

Or you can just hit Amazon and get something like this: https://amzn.to/2E8d3ev

It will do around 35-40w at 6 ohm, so you'll get loads of sound on those speakers.  Even with just 10w output on those speakers, in a small room it will be enough.

 

If you want something cheaper, this will also work just fine ... would do around 20-25w : https://amzn.to/2El7pX9

 

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1 minute ago, mariushm said:

Or you can just hit Amazon and get something like this: https://amzn.to/2E8d3ev

It will do around 35-40w at 6 ohm, so you'll get loads of sound on those speakers.  Even with just 10w output on those speakers, in a small room it will be enough.

 

If you want something cheaper, this will also work just fine ... would do around 20-25w : https://amzn.to/2El7pX9

 

They are quite good AMPs but i want to make the circuit myself. I am just doing this for fun.

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In that case, it would be easier for you to go with a class AB amplifier, since you ca make the power supply out of a simple transformer and you can basically solder all components on a prototyping board, no surface mounted stuff.

 

Something super simple would be TDA7296 ( datasheet here  ) ... it can do 30w at 6 ohm with +/- 21v  (supports up to +/- 35v)  and you can also connect  two together in bridge mode to get up to 60w on a speaker... that's how I'd do it, in bridge mode, since the chips are cheap.

 

So you can grab a standard cheap 2 x 18v transformer (though it would have to be big enough,for example if you want 60w then you need around 150VA ... so for 2 x 60w you'd need a 200-300VA transformer) and you get your split power supply... rest is super easy ... picture straight from datasheet :

 

tda7296_single.png.6a96d3afce53effae50d60001863dbfe.png

 

tda7296_board.png.90ca0a841099f73c75678ac8f19738a2.png

 

 

tda7296.png.e58103a7cbd5891c727c60ab1f54a755.png

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