I would like to add a volume pot and a buffer in front of my 6/24 xover.
Is this sketch correct, will it work?
Is this sketch correct, will it work?
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Here is my completed 6-24 active crossover in an integrated line stage. BA2018 line stage with Salas I-select input with Academy Audio VCU Muse volume control. The power supply is remote with a VRDN set to +18 -18vdc and a Meanwell hospital grade 24v SMPS with an SMPS filter in the power supply housing and another under the 6-24 PCB. Both power supplies have voltage adjustments, which I set under load. There is a +15 -15vdc regulator for the I-selec, VCU and Mute relay. The 6-24 has 24 postion 50K pots for low and high level, it uses 2SK170BL JFETs for the buffers. I used 6 matched pairs where the matching is left and right channels. I raised the 6-24 PCB and made a clear plexiglass cover with holes for the 6-24 adjusting pots.
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Wow. I wish I van go back to not knowing how complicated this project is.
Why do you have both an smps and smps filter and a linear power supply in the same box?
with this sophisticated build, i can only suggest to replace smps with linear supply like Salas BiB
Here with a better drawing again my questions:
1. can I add for overall volume control an additional frontend to the existing front end (marked with yellow marker)?
2. can I remove the coupling caps and the connections to VREF in the existing front-ends (red circles)?
Thanks for your feedback.
1. can I add for overall volume control an additional frontend to the existing front end (marked with yellow marker)?
2. can I remove the coupling caps and the connections to VREF in the existing front-ends (red circles)?
Thanks for your feedback.
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If you will have small voltage on the buffer output, it may cause scratchy sound in the volume pots. I would suggest to use one cap on the buffer output. Just like B1.
But now I got aware, that on the first buffer stages from the xover VREF is missing . You are right, I need a cap on the output of my new buffer and I also need connections to VREF (the red circles in the schematics of post #1010).
Like this:
Like this:
Boahh, yeah! Thanks for the very good suggestion, Nelson!
This way?
Or add 1MEG between VREF and the pots?
This way?
Or add 1MEG between VREF and the pots?
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Ahh, yes! Adding 1 Meg between the pots and VREF would disable low volume levels for the channels, as it would completely change the voltage divider for volume control.
none or few ohms
10R as max - you probably don't want to decrease Iq too much
of course - take care that paths "low pass filter" and "high pass filter" are AC coupled ( there is cap to block present DC)
10R as max - you probably don't want to decrease Iq too much
of course - take care that paths "low pass filter" and "high pass filter" are AC coupled ( there is cap to block present DC)