guitar stompboxes and electronics
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.
Will Cote said:
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
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
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
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
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
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
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
Mário Calegaro said:
What is the 100ohm thing? Why use this? GGG doesn´t explain why…
Posted 19.11.2009 at 11:35 pm
@Mario: That resistor and the 100µF electrolytic form a filter for power supply filtering (=less hum…)
Posted 08.12.2009 at 6:10 pm
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
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
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
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.
Posted 28.12.2009 at 2:34 pm
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
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
Posted 27.04.2010 at 2:07 pm
@Hector: wich one of the three diodes did you remove?
Posted 10.10.2010 at 4:15 pm
Edit: finished the 250 today without removing anything, PCB and part’s values exactly as above: it sounds GREAT and hissless, thank you Gauss.
BTW: I had to build a new clean PCB and rebuild the whole thing carefully but now it really rocks.
Posted 24.04.2011 at 11:35 am
i try to build this, but i use 1/2 watt resistor for all resistor, but i not yet test this build, because i haven’t a electric guitar, lol:D
Posted 17.07.2012 at 10:07 pm
מה זה ניהול תיקי השקעות said:
מה זה ניהול תיקי השקעות…
… ניהול תיק השקעות – באמצעות ניהול תיקי השקעות, נכון, יכול להניב רווחים משמעותיים ולשפר את ההכנסה החודשית, תוך שמירה על החסכונות. נניח שלאדם יש סכום כסף מסוים והוא רוצה להגן עליו ואולי אפילו להרוויח… gaussmarkov: diy fx » Overdrive 250 ……
Posted 01.10.2012 at 11:51 pm
hola lista de componentes gracias no las encuentro saludos!!!
Posted 30.01.2013 at 12:02 pm
hola pueden poner la lista de componentes detallada con sus valores gracias….
Posted 30.01.2013 at 12:03 pm
onde se localiza o OUT do OverDrive 250 Clone?? é no N° 2 DO POT??? SOU NOVATO NO ASSUNTO desculpas.
Posted 14.02.2013 at 5:41 pm
Where to add a footswitch?
Posted 04.06.2013 at 6:37 pm
In what way is best:
Posted 04.06.2013 at 7:19 pm
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