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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Pre Amp
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Old 4th December 2017, 11:17 AM   #1
kbyrne is offline kbyrne  United States
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Default Pre Amp

I just bought a Pre_Amp kit and have a question. I want to add a balance pot
of 100k blue velvet type to match 100k volume pot. How will this affect the circuit of pdf. Am I right to assume that the volume will be lowered other than that it will not adversly affect the circuit.
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File Type: pdf JC2 v3 construction guide.pdf (191.3 KB, 136 views)
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Old 4th December 2017, 01:28 PM   #2
JMFahey is offline JMFahey  Argentina
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Please post what actual balance circuit you will use.
You show active side of preamp only but not the passive one, where your doubt lies.
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Old 4th December 2017, 01:44 PM   #3
kbyrne is offline kbyrne  United States
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I was only thinking about a board with volume alps and the second alps wired backwards then wired to kit board.
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Old 4th December 2017, 04:34 PM   #4
kbyrne is offline kbyrne  United States
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I am not shure what you ment by your post reply. This is a buffered pre amp with a tone control board after it. What type? transistor or op_Amp. That is another question so I can figure out this box idea I have.
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Old 5th December 2017, 02:31 AM   #5
PRR is offline PRR  United States
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There are several connections for balance pots. Which plan will you use?
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Old 5th December 2017, 10:11 AM   #6
DF96 is offline DF96  England
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Perhaps he is asking us to tell him how to do it?
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Old 5th December 2017, 01:05 PM   #7
kbyrne is offline kbyrne  United States
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Default Pre Amp

I just uploaded a sch that I have in Eagle. Question is how will this brd before my kit affect the outcome of buffered Pre Amp? What can I expect and is there a better way to get Volume and Balance into the front end of my kit project?
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File Type: pdf Buffered_Volume_Ballance.pdf (13.0 KB, 44 views)
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Old 5th December 2017, 07:08 PM   #8
PRR is offline PRR  United States
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Quote:
Originally Posted by kbyrne View Post
I just uploaded a sch....
If P2 is a dual Linear, you get 6dB lower signal (often not a problem) and very insignificant change of your Loudness compensation.
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Old 5th December 2017, 07:43 PM   #9
kbyrne is offline kbyrne  United States
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Thank you for reply. Both pots are blue velvet Alps types bought in China and are B100k
linear types. I heard on a few web sites Alps are the type to buy but am new to this type of thinking. At 6db loss is NE5532 Treble, Midrange & Bass better or would a transistor
tone control be better?
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Old 6th December 2017, 05:01 AM   #10
PRR is offline PRR  United States
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Quote:
Originally Posted by kbyrne View Post
... NE5532 Treble, Midrange & Bass better or would a transistor tone control be better?
Now there is a tone control involved?

Might be best to find plans for a "complete" control preamp, not a basic preamp with things attached.
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