Sunday 14 February 2010

Menatone Red Snapper - 3 knob

9 comments:

  1. I think the original 3 knob Snapper had an RC4558P, but try a few different dual opamps and use the one you like best. JRC4558, TL072, LF353, LM1458 and NE5532 can all be used if you want to experiment.

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  2. Those 'ground' wires, do the all go to sleeve of the input jack?

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  3. Yes, or any other central ground point with all the other required grounds, input and output jacks, negative of the supply, LED cathode etc.

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  4. I finished the pedal, but a problem. when turned on, no signal, when turned off I do have a signal. I can trace the signal path, but when entering the IC the signal is gone (after pin 3).
    Any suggestions?
    regards,
    Lars

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  5. Which IC have you used and are you sure it's working? The layout is definitely verified.

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  6. hi,
    i got it working. It seems that this pedal doesn't like boss psa adapters so I've used a batt. instead and know it's working fine!
    grt. lars

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  7. Here's a question. I used to have a Red Snapper and it was great. Well, I built this, and it sounds really good, but not really the same. It's also much, much dirtier than my old 3 knob snapper. Most of the layouts/schems I've seen seem to suggest a 1 meg resistor in series between the non-inverting inputs and the voltage divider formed by those two 10 K resistors. Could that be the issue here?

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  8. I used this schematic to do the layout from:

    http://i76.photobucket.com/albums/j6/IvIark_2006/Layouts/Schematics/red_snapper.jpg

    That has a 1M between the first opamp and vref, and the non-inverting input of the second opamp directly connected to vref which is as I have done it in the layout (top row 3rd from left to the pink wire commoned connections which is the vref line).

    I think some older Red Snappers only used a 500K gain pot and this would be less dirty. That may be worth a try to see if you get the response you want.

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