Hot Harmonics

by gaussmarkov

Hot Harmonics Layout

I just revised this one, after noticing some needed improvements. It just shows how layout design improves with practice. Because I use Eagle, the verification of the first version is adequate for this one. Here’s my original comments.

Frank Clarke designed this 4049 circuit. If you like the Red Llama, you will like this one, too. 9 volts verified on the Aron’s forum that this layout works. To see my source, consult this post by stm on the forum.

Also, check out Daniel’s gorgeous build on his site, DSM Noisemaker, and don’t miss Frank Clarke’s new site,

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16 Responses to “Hot Harmonics”

  1. josé Ignacio said:

    Hi. Great site you have here.
    I’m planning to make a free printing tutorial for PCBs and I would like to use some of your layouts. Please contact me by mail (couldn’t find yours in the site). Thanks and greetings from Chile.

    Posted 23.09.2007 at 9:16 am

  2. gaussmarkov said:

    Hi José,

    Thanks for the compliment! And you are right: I need an email link somewhere. 🙂

    Please feel free to use any layouts that you like. If you send me the url for your tutorial, I will put some links to it on I have more eagle tutorials planned and your tutorial might fit well with those as well.

    All the best, gm

    Posted 23.09.2007 at 9:39 am

  3. Alex said:

    Hi Markov! 😉
    Can I find a pcb ready to stamp of this layout?


    Posted 24.10.2007 at 2:34 pm

  4. Alex said:

    I’m sorry, Paul, I don’t have seen the lateral menu with the pcb, sorry!

    Posted 24.10.2007 at 2:49 pm

  5. golfdeguitarist said:

    Hi mr.gaussmarkov

    is it possible to work with 18v ? i want to buildone and put it into guitar but my guitar pickup use 18v ( you know duncan ) … is possible to use this with 18 volts ?

    Thanks you very much!

    Posted 06.12.2007 at 2:15 am

  6. gaussmarkov said:


    in principle, yes. the CD4049UB can take a 20V supply. you would have to be sure that all of your components are rated for more than 18V. for capacitors, this usually means a 25V rating.

    i don’t think the circuit will sound the same though. have you tried looking on aron’s forum for information about this? if you don’t find any, i suggest you post your question there.

    all the best, gm

    Posted 06.12.2007 at 7:24 am

  7. golfdeguitarist said:

    Thanks, i’ll look about aron’s forum …. too bad i can’t find the 2N5475 in my hometown….

    Anyway i must build this one but maybe not right now (only 5475 is missed , other is ready )

    really want to hear the sound when it ring with my axe…

    Thanks you very much…

    Posted 15.12.2007 at 7:51 am

  8. Tasteslikellama said:

    Can you confirm the eagle files are the latest ones? They seem to be back from 06.

    Posted 26.01.2008 at 3:23 am

  9. gaussmarkov said:

    just checked … the schem and board files are dated 1/31/2007, which is the same as on my hard drive. the description and error check files, which i will delete, are older.

    thanks for checking! you never know. 🙂

    Posted 26.01.2008 at 7:20 am

  10. gaussmarkov said:

    nope. my mistake. there are some newer files, as indicated by the date on that board layout.

    i just added them. they are called hotharmonics.brd and hotharmonics.sch.

    Posted 26.01.2008 at 10:33 am

  11. Tasteslikellama said:

    Excellent! They all look the same now! 🙂 Many thanks as always!

    Posted 28.01.2008 at 3:27 am

  12. pypeexari said:

    emm.. luv it..

    Posted 22.04.2009 at 7:53 am

  13. El Vasco said:

    I like it so much. I make it, I used it and I like it. Really thanks for your site, it´s a cool and great site for any diyer.

    Posted 22.11.2009 at 12:53 pm

  14. david said:

    do you have this in veraboard

    Posted 03.08.2011 at 4:10 pm

  15. adam said:

    Hiya is this page still monitored??

    Posted 27.05.2014 at 12:47 pm

  16. gaussmarkov said:

    Yes, but minimally (just to remove the spam).

    Posted 04.06.2014 at 9:25 am