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Old 14th September 2012, 03:01 PM   #11
Nuuk is offline Nuuk  United Kingdom
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Quote:
Originally Posted by palmas View Post
What gain would you like to have?
Around 10 db max.
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Old 14th September 2012, 03:24 PM   #12
palmas is offline palmas  Portugal
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something like this?
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File Type: pdf PALMAS REFERENCE PREAMP.pdf (11.5 KB, 23 views)
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Old 15th September 2012, 07:59 AM   #13
Nuuk is offline Nuuk  United Kingdom
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Palmas, I'm nowhere near competent enough to assess your design. I was thinking more of being able to adapt the existing circuit to have lower gain, rather than building a complete new one.
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Old 15th September 2012, 09:30 AM   #14
DF96 is offline DF96  England
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In that circuit the gain is more or less set by the valve. To get different gain you need a different valve or a different circuit. A different valve might mean circuit changes anyway. It is only circuits with significant negative feedback which can be simply altered to get different gain. Even then, less gain means higher loop gain which can mean instability.
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Old 15th September 2012, 09:52 AM   #15
Nuuk is offline Nuuk  United Kingdom
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Thanks DF96. I'll leave that one well alone then, and think about building a new one using the same power supply (which is in a separate box).
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