Instructables

Overdrive Pedal

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An overdrive guitar pedal is kind of like a less harsh distortion pedal. Technically speaking, whereas a distortion pedal clips an amplified waveform at a particular height, the overdrive pedal actually rounds the top of the clipped wave. While this still makes it a bit fuzzy when you crank up the gain, it sounds less extreme than a distortion or fuzz pedal. What is cool about this pedal is that it adds a little extra warmth to your signal when you are strumming gently, but when you really strum hard, the audio spikes up into crunchy distortion territory. While this is generally a very subtle effect, it is actually quite robust in terms of the different types of sounds that you can get out of it. It is great for adding a little something extra to any effects chain.
 
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Step 1: Materials

Picture of Materials
You will need:

(x1) 2N3904 NPN transistor (Radioshack #276-2016)
(x1) 0.1uF capacitor (Radioshack #55047557)
(x1) 0.047uF capacitor (Radioshack #55047555)
(x2) 0.01uF capacitor (Radioshack #55047551)
(x1) 100K logarithmic potentiometer (Radioshack #271-1722)
(x1) 100K linear potentiometer (Radioshack #271-092)
(x1) 10K linear potentiometer (Radioshack #271-1715)
(x1) 2.2M ohm resistor (Radioshack #55049482)
(x1) 33K ohm resistor (Radioshack #55049446)
(x1) 22 ohm resistor (Radioshack #271-1339)
(x1) 3.3K ohm resistor (Radioshack #271-1328)
(x1) 680 ohm resistor (Radioshack #55048032)
(x1) PC Board (Radioshack #276-150)
(x1) 9V battery snap (Radioshack #270-324)
(x1) 9V battery (Radioshack #23-853)
(x3) Knobs (Radioshack #274-415)
(x2) Stereo audio jacks (Radioshack #274-312)
(x1) Foot switch
(x1) BB project enclosure
(x1) 5" x 4" x 1/8" rubber sheet
(x1) 5" x 4" x 1/8" cork sheet

I love how neat and clean everything is, but I do have a concern with the parts list/schematic- it seems like you have parts in the schematic that aren't listed on the list (those extra two diodes, for example), and there's a label for a second transistor but no transistor there (the 1N4148)? Maybe I'm missing something, but I'd love to give this project a swing. Very tight Instructable, friend!

Maggoo13 days ago

looks good, cosmetically. I find it odd that you went to the trouble of a produced video that didn't showcase the sound of the pedal (or, uh, it wasn't distorted sounding).

rjohanson28 days ago

Can you tell me more accurate how you connected stereo jacks, my pedal dont work and I think that I have problem with stereo jacks. Can you send me some pic. about step 14.

WadeRS1 month ago
the schematic doesn't seem to be there anymore?
randofo (author)  WadeRS1 month ago

It is still in Step 2

kimjames2294 months ago
Hey randy! I am currently making this od pedal and I was looking at the picture of your circuit board and it seems like a lot extra soldering is done on the other side, is it possible to get a clear picture of that? And also it seems that there are two extra resistors on your board that's not listed on the schematic??
randofo (author)  kimjames2294 months ago
I didn't have a 2.2m resistor on hand, so I used two 1M resistors and a 200K resistor in series.

Honestly, the speed at which I might get another picture posted is not going to be very fast. Most of the connections on the underside are largely ground connections. I'd just go by the schematic.
jpacheco4 randofo2 months ago

I need the pictures from above and below too! It has been a while since the last time I translated a diagram into a perf board so that could really help me. Please!

Overall price??
How much did this cost overall??
Devansh146 months ago
hi, nice instructable. Really loved it. But I have a question. How did you gt that perfect white background for pictures in your instructables. I am also going to post m first instructable and I think that this could really help me.
Regards,
Devansh.
randofo (author)  Devansh145 months ago
a combination of shooting them on a white backdrop with a nice set of photo strobes and Photoshop post-processing.
spaczkowski6 months ago
What kind of diodes do you use? I mean parameters
randofo (author)  spaczkowski5 months ago
I used 1N4148 diodes and some random 5mm LEDs I had lying around. You can try different pairs of just about any diode. It really comes down to what sounds good to you.
davephilpott5 months ago
What are the LEDs rated at? What do they do in the circuit besides illuminate?
randofo (author)  davephilpott5 months ago
I don't know the rating. They don't illuminate. They clip the sound similar to other diode pairs. However, they produce a slightly different sound than silicon diodes.
Jaxton Maez5 months ago
My science teacher made a few, but he's found a cheap way to etch the medal to cool designs.
steveo13576 months ago
also where did you get the foot switch?
You can also look on eBay - I bought a 3PDT switch for $6 shipped.
(the only difference with 3PDT and DPDT that I know of is that 3PDT allow for "true bypass" when the pedal is switched off)
ok thanks :)
randofo (author)  steveo13576 months ago
http://www.mouser.com/ProductDetail/Alpha-Taiwan/SF12020F-0202-20R-L-011/?qs=sGAEpiMZZMuLS1mv1rPY1r0oJ1%2fJfVdO
KROKKENOSTER6 months ago
This is a cool little circuit but do you know where this came from? I have forgotten who the group was but it was a pop group whose loudspeakers had a tear in one of the cones. They did not have the money or time to replace/repair this as it happened just before the gig. Their audience liked this new sound so much that they dared not repair this and this was then made electronically with tubes ( Early'60 's) New popular sound due to poverty we may add.
The Kinks.
scd6 months ago
How sensitive is this circuit to the supply voltage? Would it run OK on +5V rather than +9V? Thanks :)
booga0076 months ago
Nice instructable. Your video sound and looks like a Fundable video :)
What sound track did you use behind you?
websterjrco6 months ago
Nice work and clean enclosure design, but a few respectful suggestions ...
-> Actually getting to hear what this sounds like, including contrasting panning between the two diode types, would be helpful before spending time building it.
-> Include the switch and the stereo-jacks in the schematic, noting it almost appears as if you are exploiting the shorting of ground to one side (via non-stereo plug) as a power switch?
As a hobbyist, lack of these wiring details in the schematic makes double-checking the connections against the photos very difficult.
ditto on the demo video of the completed build, would be really helpful. Overall very impressive looking build and well done instructable!
Sleep E6 months ago
A couple of things. I would really like to hear the sound and range of sound of the pedal, to help me decide if it is worth my time investment. Also, it appears that you are a very skilled video producer. A build video, or at least a wiring diagram would help those of us who have yet to be schooled in reading a schematic. Excellent clean job, be proud!
ditto on the demo video of the completed build, would be really helpful. Overall very impressive looking build and well done instructable!
djsfantasi6 months ago
These steps would benefit from a wiring diagram, showing the connections graphically.
djsfantasi6 months ago
These steps would benefit from a wiring diagram, showing the connections graphically.
ssamc6 months ago
Very clean work. Congratulations!
Lindie6 months ago
Looks great!
Hume6 months ago
This is beautiful. Great work!

Where do you get a project enclosure like that?
tony178376 months ago
I'd love to build one but I'm not great with schematics . Could you post a wiring diagram.
fixasso6 months ago
must have
*less
I doubt ill ever build something like this but I enjoyed it none the oess
steveo13576 months ago
love it!
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