Wednesday, 23 March 2022

Electro Harmonix Pulsar - Big box version

 Schematic is avaiable HERE.




7 comments:

  1. Hey fuzzhead anyway to do this layout with a LM13700 instead of the 3080?

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  2. This is definitely interesting. It seems the 3080 chips have been reissued too.

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  3. hi,

    I've gone through it, node by node, and found everything perfect (matching the schematic)

    ....
    an obvious one: D1 to be renamed to D3..

    and a possible error:
    the jumper from 11C to 1E seems to me as a fault...
    just look...

    _ _ _ _ _

    +1: and I don't understand the 7809 regulator... on the schematic, too
    given that DC in = 9v...

    I mean, to get 9 volts, the input voltage should be 12v, or at least 11.5 :)

    I think, when I build this, I'll use 12v, and that would be it...
    (I'll get back to this in late April)


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  4. as to the 78L09, here is a great thread:
    https://www.freestompboxes.org/viewtopic.php?f=1&p=282273#p282273

    the bottom line:
    USE 12v DC regulated,
    OR an unregulated "9v" which outputs 15v without a load...
    // OR an EHX 9v adapter, which is the latter...

    BUT then, if 12 volts is the DC input, that CLR resistor to the
    bypass LED+ might have a function, again, and should be given a different value...

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  5. PS:
    the entire thread is cool, in the above link I accidentally embedded a target (#p282273) where the link will land, but it is NOT that post that is relevant...

    in short:
    read the thread, or if you only have time for one post,
    read j_flanders'

    https://www.freestompboxes.org/viewtopic.php?p=282270#p282270

    but read al of it, it's not much at all :)

    https://www.freestompboxes.org/viewtopic.php?t=30799

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  6. Verified.
    according to schematic couple things is different.
    1. D1 is 1N5817
    2. D2, D3 reversed orientation
    3. cut from K14 should be on K16 but this changes nothing

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