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Old 16th March 2004, 02:53 PM   #1
deji is offline deji  Nigeria
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Default how to bring down line level signal to preamplifier level

hi there
i wonder if anyone could assist me on this one,i want to couple the audio output of my computer sound card to my stereo deck but i dont know if the signal level wont be too high.the deck uses a digital volume control ic as the preamp i wonder what i can do to the line level signal to reduce it to the preamp level
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Old 17th March 2004, 03:46 AM   #2
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Generic audio preamplifiers are for line level inputs so you should be ok.

If in doubt use a simple voltage divider resistor network to test and take it away if you don't need it.

This link will how you what they are, it's talking about speaker to line level which is not what you need but the idea is the same...

http://www.hut.fi/Misc/Electronics/c...r_to_line.html
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Old 17th March 2004, 10:26 AM   #3
deji is offline deji  Nigeria
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am sorrry if this sounds dumb but could u shed a little light on the term "generic audio preamplifiers".thanks
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Old 17th March 2004, 10:31 AM   #4
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A "generic audio preamplifier" is one which handles line level audio.
It expects incoming sources to have an average level of about .4 volt but can accept audio levels up to a couple of volts.

Go ahead and connect the output of your sound card to your preamp. If the level is too high, turn it down using your computer's software.

I hope this helps.
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Old 17th March 2004, 10:32 AM   #5
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Simply put - preamplifiers work at line level, sreten.
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Old 17th March 2004, 11:30 AM   #6
deji is offline deji  Nigeria
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how do i conclude that a paricular chip is a generic chip,the particular one in question is a TC9153AP digital volume control chip
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Old 17th March 2004, 11:35 AM   #7
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Line out from your PC will work together with your pre amp, I'm sure! No need to worry.
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Old 17th March 2004, 11:35 AM   #8
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What is the problem with connecting the two together and listening?

Give it a try.
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Old 17th March 2004, 11:50 AM   #9
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all right thanks everybody,i;ll give it a try but i really hate seeing a chip go up in flames...........chuckles
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Old 19th March 2004, 02:29 AM   #10
Diode is offline Diode  United States
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Sorry for the time lapse......

Line level and preamp level are the same thing. That's where you are getting confused. Line level is also the same as High Impedance and Low Impedance is power output. If you are doing the conversion say in car audio application, you want an LLC. Line Level Convertor. You would connect the Low side to the output of the Car's head unit. Those wires would drive a speaker..... The High Impedence side would go to the INPUT of another power amp. The good ones are NOT resistor dropping networks. They are small audio isolation transformers so if the primary of the transformer frys, the input to the power amp is isolated and protected. The signal coming out of a sound card IS Line Level or preamp level.

Line Level = preamp level!

Don't confuse Power Out with Line Level. There is only one type of output capable of driving a loudspeaker (excluding headphones) It is called POWER OUT!!!!!

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