Overdrive 250

 by gaussmarkov

Overdrive 250 Layout

The DOD Overdrive 250 clone can also be used to create an MXR Distorion Plus clone. See the project’s sources: http://tonepad.com and http://www.generalguitargadgets.com.


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15 Responses to “Overdrive 250”

  1. Will Cote said:

    Hey Gauss,
    Is that a 50k reverse for the gain? I’ve mostly seen 500k reverse on these 250 ODs…just checking! Thanks for creating this site~ I’ve built several projects from here and they all kick arse!

    Posted 03.10.2007 at 8:34 am

  2. gaussmarkov said:

    Will, you are a saint! Thanks for pointing that out. It’s my mistake and I will fix it immediately.

    And thanks for the encouraging word! :)

    Posted 03.10.2007 at 9:15 am

  3. Gonzalo said:

    Is there a particular reason for the 1M pull-up resistor instead of the 470k that was on the original?

    Posted 31.03.2008 at 5:52 am

  4. gaussmarkov said:

    whether 470k or 1M is original depends on who you ask. ;-) see generalguitargadgets and tonepad for differences of opinion. if you have an authoritative source for the value, please tell us.

    imho it makes no discernible difference which value you use. this is because the the noninverting input of the op-amp has a very high impedance. the resistor is there to offset (or, as you say, “pull up”) that input to virtual ground, half the 9V supply.

    thanks for asking! :-)

    Posted 31.03.2008 at 8:16 am

  5. RedGuitar said:

    hi gauss, fun to fine your website. i have finished my DOD250 through your schematics and sound is crazy great. but i still have an noise problem . why when i try to open drive to full gain, that is too much humming and noisy. can you tell me how to eliminating the noise withous NoiseGate tools. thank you before and after. sory about my english, i am from aceh – indonesia

    Posted 10.07.2008 at 2:32 am

  6. bambi said:

    hi. . . GM, thanks for this site. i like it!!!, This 250 overdrive is really great sound. but, there is something a ground-noise. tell me what to do how to disappear these noise.

    SORRY for my English words> b’cos i am Filipino. . .

    Posted 27.04.2009 at 5:31 am

  7. gaussmarkov said:

    sorry, i cannot debug your OD250 here. but you should be able to get rid of the hum. i suggest you ask the good folks at diystompboxes.com.

    all the best, gm

    Posted 28.04.2009 at 8:29 pm

  8. Mário Calegaro said:

    What is the 100ohm thing? Why use this? GGG doesn´t explain why…

    Posted 19.11.2009 at 11:35 pm

  9. Immo said:

    @Mario: That resistor and the 100µF electrolytic form a filter for power supply filtering (=less hum…)
    http://www.diystompboxes.com/smfforum/index.php?topic=49603.msg369563#msg369563

    Posted 08.12.2009 at 6:10 pm

  10. Hector said:

    Hey Gauss:

    i’m trying to get this pedal to work but i’m only getting a humming when i strum the strings then the sound dies.
    i use specs on your pdf exept for the C3 25pF cap(i used a 22pF) and the 500k rev log pot, i could not find one so i used a linear 500k pot.
    Is this what is causing the humming and lack of gain?

    Posted 28.12.2009 at 3:07 am

  11. gaussmarkov said:

    hi hector, sorry no — those subs do not explain your problems. try tracing through your circuit with a sound probe and you will find where things are going wrong. all the best, gauss

    Posted 28.12.2009 at 10:32 am

  12. Hector said:

    thanks Gauss!!

    i’ll check deeper into my wiring and the circuit.
    one more question,is the 500k rev pot is realy needed?

    by the way your site is awesome and realy helfull :) thak you!!

    Posted 28.12.2009 at 2:19 pm

  13. gaussmarkov said:

    hi! you are most welcome!

    any 500k pot will work because the range of resistances is the same. the way the control will feel over that range depends on whether you have a linear, audio, or other pot type.

    –gaussmarkov

    Posted 28.12.2009 at 2:34 pm

  14. Hector said:

    i finaly got it to work!!
    they where the diodes so i replace them and use only two.
    I have to say that the sound is sweet,clean boost and hummless drive, this pedal is a must build!

    thanks for your support Gauss.

    Posted 02.01.2010 at 6:31 am

  15. Dr Robb said:

    As this is Gauss’ design, I have NO DOUBT it must sound AWESOME and will definitely be building one…more of a boost for solonig in my pedal board.

    However, this link references Tonepad and General Guitar Gadgets. After reviewing all of the schematics, they don’t even seem the say! :O Many components are different and also they go from symmetric to asymmetric clipping! :O

    What gives??

    Posted 27.04.2010 at 2:07 pm



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