This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Saturday, February 7, 2015

Heart Throb Tremolo

The Heart Throb is a Schaller Tremolo circuit modified by MarkM, and uses pretty standard parts that you probably have kicking around in your parts drawer(s). The SPDT switch controls the rate. I've added polarity protection and power filtering. The LED not only is an on/off indicator, but will pulse to the rate of the effect.



20 comments:

  1. Replies
    1. Yep. I've built 2 of them and they sound great.

      Delete
  2. Thanks.. good job. i built now

    ReplyDelete
  3. hey, could i substitute MPSA18'S for the transistors in this?

    ReplyDelete
  4. hey do you have the schematic for this one?

    ReplyDelete
    Replies
    1. http://s167.photobucket.com/user/rocklander/media/heartthrob-tremolo-schem.jpg.html

      Delete
    2. Thanks men, hey i cant find the transfer image for this one, what brand is it?

      Delete
  5. You experiencing any volume drop issue in this one brother?

    ReplyDelete
  6. Just built it, sounds great however I'm. Getting a slight volume drop

    ReplyDelete
  7. Do these transistors need to be biased?

    ReplyDelete
    Replies
    1. I didn't match the ones in the 2 that I've built with no issues.

      Delete
  8. Built this and it sounds great. My only problem is that the switch has no effect at all. Anyone have any ideas? For what it's worth the voltages at the switch are SW2 0.01-0.09 and SW3 0.02-0.33 with both pots at max.

    ReplyDelete
    Replies
    1. I've not run across that issue. Have you checked for any shorts or bad components?

      Delete
  9. Can i use 2N3904 instead of 2n5088?

    ReplyDelete
    Replies
    1. Probably. Use sockets though. MPSA18, BC549C or BC550C or other high gain NPNs will probably also work.

      Delete
    2. BC549/BC550 works better than 2N3904 for substitute 2N5088?

      Delete
    3. Like I said above, the 2N3904 will probably work, just depends on the gain. High gain transistors have a better chance of working properly.

      Delete