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Old 24th September 2006, 05:05 PM   #1
Empty is offline Empty  Norway
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Default Add pre-out to a receiver?

Hi,
I have a Teac AG-7D receiver but it has no pre-out, and I was wondering if someone here had schematics to how to add, just to the front speakers ?
I am planning til build myself a chip-amp and use on my Patos B-400 but then i'll need pre-out from my receiver.
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Old 25th September 2006, 04:16 AM   #2
anatech is offline anatech  Canada
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Hi Empty,
The problem is that the level into most amp sections is far lower than a standard pre out. You would need to pick the signal off and amplifiy it. You would also need to add a muting relay and couple it to the signal muting circuit to be safe.

So you can see that you have some work ahead of you. The very forst thing you need to do is purchase the service manual from Teac. They are reasonably priced and this is better than trying to work with a PDF file.

-Chris
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Old 1st October 2006, 11:04 PM   #3
Empty is offline Empty  Norway
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I found some new info.
I saw somewhere that it is possible to connect a 1.2kOhm resistor in serial to the speaker +, and a 68Ohm resistor to ground. Is this true ?
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Old 1st October 2006, 11:12 PM   #4
anatech is offline anatech  Canada
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Hi Empty,
Quote:
I saw somewhere that it is possible to connect a 1.2kOhm resistor in serial to the speaker +, and a 68Ohm resistor to ground. Is this true ?
Yes. The ratio will depend on the power levels.

Noisier, higher distortion. After all, it's going through a power amp section.

-Chris
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