Sunday, 28 September 2014

Blade VSC Preamp, modified

Ran into a schematic of a preamp on-board circuit found in Blade brand guitars. The original called for LM4580 dual opamp, other channel unused. So i drew this layout for a single channel chip and added volume control, power filtering etc. You could try on a number of single opamps to see which sounds best to you. I'd also suggest trying linear taper for volume control. Should make a nice mids booster or a simple box that'll fatten your tone.


11 comments:

  1. Replies
    1. Cheers! I'll tag it.

      How does it sound?
      +m

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    2. It sounds like a mid boost, which becomes more of an overdrive when the Mids are turned up. This can be compensated by turning down the Volume. I am going to use this one as a pre-gain stage for a sixties type of fuzz.

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    3. i like the time vero got posted :P

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    4. Heehee :) I recently noticed that the time i've created my FSB account was 18:15. And one guy i sent a parcel to today had his phone number ending in ..2907. 21:12 looks cool, but once you start seeing semiconductor type numbers everywhere... :)
      +m

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  2. Hi. Do you have a clear schematic for this?

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  3. I'm planning to build this as onboard preamp, without that extra volume pot and with a trim pot for mids. But how should I connect it to the guitar (stratocaster) circuit? Before or after the stock volume pot? Best would be a three position switch: "up" position - bosst actice; "middle position" - true bypass for midboost; "down" position - true bypass and battery switched off

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  4. Why did you increase the input resistor? It's a much smaller value in a Blade Guitar, as the VSC input resistance is in parallel with the volume pot.

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    1. You should ask user Induction at FSB:
      http://www.freestompboxes.org/viewtopic.php?f=7&t=18827&p=201441#p220902
      The layout is per the available schematic. Granted, it should be called "Zorro mid boost by Induction".
      +m

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