Saturday, 25 March 2017

Lovepedal Champ

This should emulate a Fender Champ sound.
You can find original FSB thread and schematic here.


22 comments:

  1. Should those 3330R resistors be 330R Alex?

    ReplyDelete
    Replies
    1. Yep, according to the original schematic over at FSB those should be 330R.

      Delete
    2. They are. Just a writing mistake. :)

      Delete
    3. Thought so man! Just wanted confirmation, thanks.

      Delete
  2. The pot is also B100K not A. Not that it really matters much as its only unity near flat out anyhow. Thanks for drawing the vero up.

    ReplyDelete
    Replies
    1. I've changed it on purpose. I guess it should work better.

      Delete
    2. I'd agree with that. Good call.

      Delete
  3. Hey Alex, just for interest - is there a specific reason you opted for a 100µF instead of 47µF as per schematic?

    ReplyDelete
    Replies
    1. Looks like the power filter cap to me. Changing this won't change the tone of the circuit, it's designed to filter any power supply noise that might make it through. I've seen 100uf used more often in modern circuits so I'm assuming it's kind of a good practice thing...

      Delete
  4. hello! is another layout at your forum section with less cuts and smaller - which one do you recomment? it is here: http://guitar-fx-layouts.42897.x6.nabble.com/Lovepedal-Champ-td36900.html

    ReplyDelete
    Replies
    1. Didn't see it. This is a simple circuit and both layouts are as good as each other. This one has more cuts and it's a row larger cause we try to avoid standing components on the main page.

      Delete
  5. Tag it, sounds good. Thanks for another cool layout Alex.
    Jimbob

    ReplyDelete
  6. Hi doest it have to be a 5088 or any transistor will do it (soundwise)? Thx

    ReplyDelete
    Replies
    1. Any NPN will work but since it doesn't have a lot of volume anything with less gain than a 5088/5089, you may find doesn't quite hit unity up full. On the flipside you could chuck a Darlington in there and grunt it right up!

      Delete
  7. Works with a few different value changes, incl 1n34a Diodes. Biggest changes were 470R (in place of 330R) and 2K4 (in place of 3K3)

    Any way to increase the gain?

    ReplyDelete
    Replies
    1. This comment has been removed by the author.

      Delete
  8. Thanks for the heads up! For extra gain ypu could increase the transistor to 2n5089 or a Darlington. Look for higher gain (hfe) transistors. You could also try removing the resistors to ground from the emitter, and just attach it directly to ground, but leave the electrolytic in parallel to ground. You could also remove the diodes to boost the output signal but youll lose some drive tones. Otherwise you could always build a simple boost as well and run it upfront to boost the gain coming in.

    ReplyDelete
    Replies
    1. Cheers. I've tried a few tranies in there, including 5089, MPSA18 and s9013 and they don't make a huge difference.
      Currently running it without volume pot, output is connected to where lug 3 should be

      Delete
  9. This comment has been removed by the author.

    ReplyDelete
  10. This pedal sounds great, is it supposed to be at unity volume near full blast? sounds great regardless, not sure if this is because i substituted the 22n cap for a 15n since it was all i had on hand

    ReplyDelete