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Tuesday, September 12, 2017

TC Electronics Spark Mini

Here's a work-a-like for the Spark Mini. It'll be a bit of a squeeze, but it should fit in a 1590A. The original is all SMD components, so the transistors listed below aren't the same as the original, but through-hole equivalents. Other NPN and PNP transistors can be used (2N5088/87, 2N3904/06, etc.). Here's the schematic for reference (requires FSB login).


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16 comments:

  1. AnjangSeptember 13, 2017 at 10:05 PM

    you have schematic for this ?

    ReplyDelete
    Replies
    1. UnknownSeptember 16, 2017 at 6:05 AM

      Man there's a link in the description.
      Just click on "schematic"

      Delete
  2. AnjangSeptember 18, 2017 at 3:46 AM

    im not found it, cause not registered in FSB

    ReplyDelete
  3. JiomyDecember 20, 2017 at 11:11 AM

    VERIFIED! Gain controll is reversed though.I used 3904/3906 with great results, the boost is way beyond 20db in mine. I will wait untill BC549's arrive so i can use those as well. Do you think i should match the trannies too to get better results? Just curious.

    ReplyDelete
  4. AnjangApril 17, 2018 at 6:06 AM

    This comment has been removed by the author.

    ReplyDelete
  5. AnjangApril 18, 2018 at 10:43 AM

    Some problem with this layout... i follow schematic, is verified, but gain control is reversed and output overload

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    Replies
    1. MaisiApril 4, 2020 at 1:49 PM

      the same for me...

      Delete
    2. Marcus CorradiniApril 19, 2020 at 11:20 PM

      Use A100k for Gain. The output should be normal. And invert the gain control...

      Delete
  6. JhonsApril 4, 2021 at 9:08 PM

    I made it. Very nice boost. but there is a slight problem. I hear there is quite a change in tone. not completely transparent. i am using 2n5551 (NPN) and 2n5401 (PNP). Double check with resistor & capasitor, but can't find anything wrong

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    Replies
    1. JhonsSeptember 27, 2021 at 2:08 PM

      Update : try with BC549 and BC558 like the orginal layout, now sounds more transparent.

      Delete
  7. UnknownJune 10, 2021 at 1:59 PM

    I have same problem with overload output

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  8. Jun dOctober 16, 2021 at 7:00 AM

    Works well! Its verified! Big boost circuit !
    Jun fr Philippines. Cheers and thanks

    ReplyDelete
  9. JacaHUN2October 11, 2022 at 11:18 AM

    So, is this verified? The schematic is a bit different from your pcb. Also I see some people commented about Gain being reversed, how's that?

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  10. TomSeptember 4, 2023 at 6:35 PM

    This is a really nice sounding boost. It seems to almost compress a tiny bit. And it adds sparkle without sounding harsh or bright. I used a 2n3906 as I didn't have the Q5 trans. And yes, gain 1/2 and gain 3 should be swapped. Thanks for sharing this.

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  11. GermanioNovember 12, 2023 at 3:18 PM

    Exelente verificado muy buen booster gracias por su trabajo saludos

    ReplyDelete
  12. liamshanMarch 25, 2024 at 7:49 PM

    verified and it work as it should put in same case with keeley mag clone so i can get unity volume and it works

    ReplyDelete