Hi all,
I have just finished a Pre-amp for my Lm3886 MonoBlock. The Passive preamp was being used before with a 100k motor Pot built using a LiteAudio Input and Motor pot control. I had an issue with this setup sounding a bit dull and so i started a thread about my dissapointment with the passive setup.
People on this forum told me that the pot value was too high and so i tried lowering this value by placing a resistor acroos the input and output of the pot to lower the value, this did seem to help however i wasnt fully satisfied so i order a replacement pot and set about builting a Nuuk Buffer and PSU. Over the weekend both of these went into the setup, I has been a lot of work since i keep insisting on building everthing into way too small enclosures. Still that my problem.
What i wanted to ask people advice about was the results.
Basiclly the issue is that at zero volume on the pot the actual volume is a loud listen level. The pot works but very rapidly so if a turn it even a few degree the neighbours start banging on the floor!!!
Nuuk brought up the isssue of grounding and that maybe the pot isnt grounded properly. I have enclosed a diagram on the current grounding layout. If anyone has any comment as to wether this is wrong please tell me. If not i will take it the pot is defective and stick back in the old 100k one and put resistors across it.
Any comment very gratefully recieved.
Phil
I have just finished a Pre-amp for my Lm3886 MonoBlock. The Passive preamp was being used before with a 100k motor Pot built using a LiteAudio Input and Motor pot control. I had an issue with this setup sounding a bit dull and so i started a thread about my dissapointment with the passive setup.
People on this forum told me that the pot value was too high and so i tried lowering this value by placing a resistor acroos the input and output of the pot to lower the value, this did seem to help however i wasnt fully satisfied so i order a replacement pot and set about builting a Nuuk Buffer and PSU. Over the weekend both of these went into the setup, I has been a lot of work since i keep insisting on building everthing into way too small enclosures. Still that my problem.
What i wanted to ask people advice about was the results.
Basiclly the issue is that at zero volume on the pot the actual volume is a loud listen level. The pot works but very rapidly so if a turn it even a few degree the neighbours start banging on the floor!!!
Nuuk brought up the isssue of grounding and that maybe the pot isnt grounded properly. I have enclosed a diagram on the current grounding layout. If anyone has any comment as to wether this is wrong please tell me. If not i will take it the pot is defective and stick back in the old 100k one and put resistors across it.
Any comment very gratefully recieved.
Phil