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Old 2nd July 2012, 05:46 PM   #7741
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What do you want that I do: disconnect Q4 & R3 + R4 connected to R1?
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Old 3rd July 2012, 10:07 AM   #7742
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Without cap multiplier, measuring C4 to GND 8,97V but I believe isn't a good reg. for a pre-pre MC....
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Old 3rd July 2012, 04:34 PM   #7743
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Why you want to take out the cap multiplier. Use the circuit as designed. There is a chip reg at 9V then a filter. The cap multiplier filter eats the reg's noise by much and brings down the voltage also. Its designed to work form that final voltage.
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Old 3rd July 2012, 04:46 PM   #7744
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With cap multipler can't reach 9V
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Old 3rd July 2012, 04:58 PM   #7745
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I repeat. The amplification circuit is not designed to work from 9V, but from about 7.5V as after the multiplier.
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Old 3rd July 2012, 05:23 PM   #7746
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I'm sorry to don't understand you before, thanks again.
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Old 7th July 2012, 03:33 PM   #7747
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Build & measurement pics Low MC pre-pre

1st pic right channel
2nd pic 1kHz direct audio generator 30dB attenuation
3rd pic lefht channel
probe x1

4th pic Low MC pre-pre including capacitance multiplier
5th pic R-Core separate PSU

Are the measurements OK?
Attached Images
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File Type: jpg DSC00053.jpg (510.0 KB, 117 views)
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File Type: jpg DSC00055.jpg (708.1 KB, 108 views)

Last edited by merlin el mago; 7th July 2012 at 03:36 PM.
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Old 7th July 2012, 03:42 PM   #7748
Salas is offline Salas  Greece
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I can see higher output than input. How much exactly, channel matching looks good, you know your numbers.
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Old 7th July 2012, 03:50 PM   #7749
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Yes channel matching seems good, how can calculate the gain?
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Old 7th July 2012, 05:13 PM   #7750
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Voltage gain in dB = 20 log Vout/Vin

Now I only need to know how calculate the volts with the scope, help please?
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