Thursday 24 November 2022

Exar MT-1 Metal

Hi yall. Noticed a week or so back that it's been exactly ten years since my first post here. To celebrate the occasion, i thought i'd post something. There's been a number of slower years along the way, but so it goes. Life has it's ups and downs. To quote one of the more interesting british bands i've found in recent years: "It's alright now. Not what you hoped for, but that's ok. Teenage hopes are never less than perfect anyway."

Now for the layout. There had been a trace up on FSB for years and it seemed a bit wonky on couple of details. Vitalii checked his unit out and there were a couple of errors on that old trace. His new trace seems to be spot on. Now, this probably won't be the low-parts-count / easy build alternative for HM-2 style sounds, but this may still be nice 1590B-sized build with enough distorion. There's also room for tweaking. For examble, one could sub one or even both clipping diode pairs for LEDs or Schottkys or use a on/off/on switch for changing them on the fly. Hi/Lo gyrator controls seem to be quite effective as well. I bet this will be a fun distortion build with no special parts required.

Sadly, no youtube demos to be found.. Should you build one of these and a make a demo? ...So i could post it up?



10 comments:

  1. Are you sure about the output buffer? Your layout looks like the 1uF is reversed.

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  2. Also. should the level not be reversed with pin 1 going to Vr and pin 3 to signal?

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  3. Oeps, that last one is more a schematic error, not your layout :)

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  4. Hmmm.. What? The output buffer 1µ cap is coming from transistor emitter to positive and negative to output resistors.. Also, the Vref is virtual ground and thus, the volume 1 should definitely be connected to that.

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    1. https://www.freestompboxes.org/download/file.php?id=42690
      You are right, I think that the schematic has the pins reversed on the level. But in the schematic the 1uF has - towards the emitter and + towards the output, in the vero it is reversed.

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  5. I'll post it in the freestompbox thread, as I think the schematic has those errors and you solved it in the vero.

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  6. miro <3

    warms my heart to see fresh posts. cheers to our unsung heros

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  7. Built a few day ago, super stoked on this!!!

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    1. I guess this can be tagged then. Cheers!
      +m

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  8. hello, one question, is this pedal already verified? Is it proven that it works?

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