Blues Driver

 by gaussmarkov

Stobiepole and I are putting this out for comment. This is a Boss BD-2 clone in two versions. Both versions are verified. The schematic source was freeinfosociety.com.

We used the J201 for the N-channel JFETs and 2N3904 and 2N3906 for the bipolar BJTs and that worked fine.  Neither are original in the Boss box.


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11 Responses to “Blues Driver”

  1. Fullback said:

    what are the code of the transistor.
    thanks

    Posted 17.08.2007 at 2:01 am

  2. gaussmarkov said:

    I was hoping that some people would try various transistors and report what they found on Aron’s forum. This is why the transistors are listed as types.

    We used J201 for n-jfet (Q1, Q2, Q4, and Q5), 2N3906 for pnp-bjt (Q3 and Q6), and 2N3904 for npn-bjt (Q7). These work very well.

    I hope this is the answer to your question.

    Posted 17.08.2007 at 7:03 am

  3. ROCKEY said:

    Hi
    I wanna to know where can we find the transistor refrence
    please guid me to find the equivalent that can we use insted of above.
    Thank you.

    Posted 20.08.2007 at 2:00 pm

  4. gaussmarkov said:

    Hi Rockey,

    That’s a good question for a DIY forum like Aron’s at http://www.diystompboxes.com/smfforum/

    All the best!

    Posted 20.08.2007 at 2:57 pm

  5. Chris Daudet said:

    Hi,

    I was wondering if there are any sounding or performance differences between the circuit with the Opamp Vr supply and the one without it.

    Thanks.

    Posted 16.09.2007 at 1:45 am

  6. gaussmarkov said:

    Hi Chris,

    I have played through both and found no discernible difference. But there are probably times when it matters. I didn’t do a really careful study. ;-)

    FWIW, I have redesigned this circuit with an input buffer (like the original) that raises the input impedance from approximately 200K up to around 700K. That does make a difference for my setup. I will post the modified layout soon.

    But if you have a low impedance source (like another stompbox), then it won’t matter much.

    All the best, gm

    Posted 16.09.2007 at 10:42 am

  7. ray said:

    hey gm, why not just drop the buffers and make a stripped down version and drop out the one diode for a bit less fizz?

    Posted 12.11.2007 at 4:01 pm

  8. gaussmarkov said:

    Hi ray,

    That’s a fine idea. And it’s one of the things that I was hoping people would do: take the circuit and experiment. Your suggestion for less (and asymetrical) clipping is just the thing.

    I hope you will try it and report back what you think. Maybe socket the diodes and try various setups?

    Cheers, gm

    Posted 12.11.2007 at 5:02 pm

  9. sebastian said:

    hi, i’m trying to “debug” my circuit, and i really need some help, i have already check the voltage of all transistors (jfet 2n5457; 2n3904; and 2n3906) and it looks good, but the volume in the out is lower than the input, even with gain and level at max.

    thank and sorry for my english (im from argentina)

    Posted 12.11.2007 at 8:33 pm

  10. gaussmarkov said:

    Hi sebastion,

    I am happy to help with debugging. The best place I know for doing that is on Aron’s forum. Send me a personal message there and I (and others) will try to help. Be sure to follow the on-line instructions about the information that you should provide (e.g., voltage readings).

    Cheers, gm

    Posted 13.11.2007 at 8:45 am

  11. cris said:

    you have a great review of op amps. Do you know where I can by an adopter to go from a straight pin configuration to a typical 4×4? Mone Allum,coom has them for 6.49 USD each and I want to buy in bulk. This could help you also.

    Posted 10.05.2008 at 4:41 pm



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