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bikenut

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  1. Advent experiment - mod - much better sound IMO

    in Advent

    Posted

    Hi Bill,

    Yes, you're right that the values are not in the table because the switch puts them in

    parallel with the 4dB components and they essentially just add more BSC. I determined

    them through LT-Spice simulation in comparision to the table values. I don't remember

    if it was the 4.7K version that I built or the 2.2 but based on the table values you show

    there the 7.5K anmd .047uF are the 4.7K version. So that is how you'd build it.

    Just to be clear, the switch is a 3 position center off DPDT switch. You build a 4dB design

    which is always in circuit, then the switch center off is 4dB, one side adds the RC to bring

    it up to 5dB, the other side to 6dB.

    5 dB: 22K in series with .01 uF to ground for right and left channels

    6 dB: 10K in series with .022 uF to ground for right and left channels

    I can determine other values if you prefer less, say 3, 2, or 1 as a min, just let me know.

    You could also use a 5 position selector that I believe is available at radio shack, if you

    want more options.

    Best regards!

    Pete, thanks for the confirmation of the toggle switch resistors & cap values.

    When you have the time, I would welcome the values for 1, 2, and 3dB.

    I may end up going with a 5 position switch for the heck of it, something to do.

    Thanks again, Bill

  2. Advent experiment - mod - much better sound IMO

    in Advent

    Posted

    Hello Pete:

    It's been so long since I've wanted to use the BSC, but I've finally built it this weekend for my New Large Advent speakers.

    I went with the 4.7K version and 6dB.

    I have it on the tape in and out on my Sansui amp, and the improvement was well worth it.

    I noticed an improvement with a single pair running and in the stacked setup.

    Thanks so much for all your efforts on this.

    I now want to build the single toggle switch version with 4dB, 5dB and 6dB for comparison, then settle on the one I like best.

    I just reviewed your earlier post and your notes and I have a question before I proceed.

    The values you listed in post #112 for the single toggle version don't match either of the 2.2 or 4.7k version values.

    Is this an error, or is it correct and the values for resistors and caps change because of the design for the single toggle version?

    Your comments below on the toggle switch version:

    Build it for 4dB of BSC, which has a shunt R of 7.5K, C of .047 uF

    One switch side gets 22K in series with .01 uF to ground, one for R another for L, this is +5 dB,

    Other switch side gets 10 K and .022 uF to ground, one for R another for L, this is +6 dB,

    Center off pos is +4 dB.

    HF boost just switches in the .0047 uF cap.

    4.7K Version:

    R1 = 4.7 K, C1 = .0047

    C2 R2

    4dB .047 7.5K

    5dB .056 5.6K

    6dB .068 4.3K <– this is what I currently went with.

    Which values should I go with for the 5dB and 6dB resistors and caps?

    I see the 4dB values are the same for both versions.

    Thanks again, Bill

  3. Advent experiment - mod - much better sound IMO

    in Advent

    Posted

    I've been asked for a schematic for the version with the 3 way switch, for 4, 5, or 6 dB of boost.

    I actually just built it, didn't draw a schematic, I probably hand drew a sketch for layout

    purposes but honestly my hand drawings are not that clear so I'm not sure if I saved it, LOL.

    The switch is a DPDT center off 3 pos switch, that is available from RS.

    I found a simpler way to do the switching that allows a single DPDT, center off, 3 pos switch to be used:

    Build it for 4 dB of BSC, which has a shunt R of 7.5K, C of .047 uF

    Wire the center of the DPDT switch to the output terminal, one section to the Right, other to the Left.

    One switch side gets 22K in series with .01 uF to ground, one for R another for L, this is +5 dB,

    Other switch side gets 10 K and .022 uF to ground, one for R another for L, this is +6 dB,

    Center off pos is +4 dB.

    HF boost just switches in the .0047 uF cap.

    Does this make sense?

    Hi Pete:

    Sorry for the delay, I know you answered my request here.

    Well, I think I understand your answer, but a simple diagram would help.

    Maybe I'll take a stab at it and send it to you before I buy the parts and try it.

    Thanks, Bill

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