9V Electric Mistress

by gaussmarkov

9V Electric Mistress

This is a meticulous reproduction of the Electric Mistress by markusw on Aron’s forum. See his post. Markus kindly sent his Eagle files for inclusion on gaussmarkov.net. Dig the way Markus converts solder lug pots to PCB mount on his build pictured above. His original project file can be found on diystompboxes.com here. Markus also designed a board to accompany the Electric Mistress for TZF. See this post.

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18 Responses to “9V Electric Mistress”

  1. gaussmarkov: diy fx » Using a Fab House said:

    […] to try. Finally, I took the plunge by sending olimex.com a smaller version of markusw’s 9V electric mistress project that I have been working […]

    Posted 19.11.2007 at 7:12 pm

  2. Audioguy said:

    Im looking for something new to build… I dont supposed you can post the smaller version you’ve made?


    Posted 02.02.2008 at 6:49 am

  3. gaussmarkov said:


    Definitely. My heart just isn’t in drafting a new version with an output boost right now. There are too many other interesting projects on the burner.

    But I will put something together shortly. Thanks for the encouragement.

    Posted 04.02.2008 at 8:13 am

  4. Audioguy said:

    fantastic! I’ll order the parts this week!

    Posted 05.02.2008 at 3:05 pm

  5. gaussmarkov said:

    yo. here’s a link to a zip file with all the images, eagle CAD files, and parts list. the .brd file is the one that i sent to olimex.

    if you have questions, send me a note. 🙂

    Posted 08.02.2008 at 7:12 pm

  6. Poniz said:

    Hi mate,
    first of all, congratulations for the excellent job and the website (one of my favs)
    i’m building a mistress following your project and wonder if there’s a way to have the filter matrix switch disabled. i have 2 mistresses (a ’79 green logo and a ’78 deluxe one) and never used the filter matrix option. so, basically, to avoid the filter switch what should i do? jumper wire somewhere or eliminating few components?

    thanks in advance
    poniz from italy

    Posted 14.07.2008 at 12:45 am

  7. Poniz said:

    ..any help, please?


    Posted 18.07.2008 at 10:10 pm

  8. gaussmarkov said:

    hi poniz,

    if you hardwire this version of the electric mistress for sweep then you can eliminate the switch and put jumpers from S1/2 to S1/3+4 and from S1/5 to S1/6.

    on some other electric mistresses, i believe you may be able to eliminate a resistor as well.

    all the best, gm/paul

    Posted 19.07.2008 at 3:24 am

  9. Poniz said:

    thanks so much paul. i’ll put the jumpers and let you know!
    thanks again and congratulation again for the excellent site


    Posted 20.07.2008 at 9:23 am

  10. James said:

    Anyone know of any updated schematics or how to build one of these without using the SAD1024 chips? I’ve been looking everywhere and can’t find any more of these chips! Even smallbear has sold the last of their supply 🙁

    Is there a compatible replacement or something, what are people using now??

    Posted 21.07.2008 at 8:50 am

  11. Poniz said:

    Hi Paul,

    i noticed that there’s a pad on the board called BYPASS. what am i supposed to solder there?

    (stupid things made the world easier for those who are afraid to ask!!!!)


    Posted 11.09.2008 at 12:18 am

  12. Poniz said:

    i meant: stupid questions (like mine) made the world easier for those who were afraid to ask!


    Posted 11.09.2008 at 5:37 am

  13. ono said:


    I want to build this FX, but like James, i could not find SAD1024, but i have MN3010. can i build this FX by only replacing the SAD1024 with MN3010? (of course i have to pay attention for the correct pin)

    thx very much


    Posted 24.09.2008 at 5:56 pm

  14. Keith said:

    Do you have any comparisons to the the original EM? Would you say that the sound of this clone is comparable to the original? Also, I have been reading the threads over on DIY Stompboxes and have been considering using the MN3007 or equivalent for this circuit. Any thoughts on this?


    Posted 10.12.2008 at 9:52 pm

  15. Miska said:

    Hello and thank you for this great site!

    I’d like to try to etch your double-sided PCB but the ZIP-file only contains 1 side of the pcb. Or maybe I’m just confused…
    “pcb.png” is the top-side, right? And the file called perf.png shows the connections on the other side, but this a component layout file and cannot be used for etching.


    Posted 17.12.2008 at 2:15 pm

  16. JP said:

    Hey guys, I have built this particular pedal before. I was able to get the SAD1024 from Small Bear, as this was several years ago. Thanks so much for the layouts (mine was single-sided PCB) and all your hard work. Worked perfectly on the first try. I added a rate LED off-board and it has been a great pedal.

    Posted 23.02.2009 at 7:16 pm

  17. Mason said:

    Hey all, i have a built this thing, and it’s partially working. If i tune the trims, i get the flanging effect, however, the rate pot seems to not do anything. Could anybody who has a fully working version, post some pin voltages ? There is some pin voltages for the markusw version, but the gm-version has dual LM358, instead of the quad LM324.

    Btw, i am planning to put it into a Boss-Pedal, and call it the “Boss’s mistress” 😉

    Posted 15.01.2010 at 10:33 am

  18. koke said:

    I’ve got a old mistress with a few wires missing, and founded this site and helped me a lot figuring out how to connect some things. However, I can’t get how to do the connections on input tip, board input, board bypass, out tip, board out and the switch. Can you help me with this? Thaks in advance

    Posted 04.12.2013 at 11:45 pm