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Post by jeromemason on Jan 31, 2015 5:30:13 GMT -6
Hey fella's, I was going to stick this in the Guitar forum, but it really needs to be in the DIY section. I've designed an OD pedal that is absolutely just amazing. I took all the things I liked from various pedals and I came up with a very basic but absolutely amazing Overdrive stomp pedal. My prototype is built from prototyping board and such but I am looking to get a run of PCB's to condense the size and to make it more reliable. First off, it's original circuit is derived from a TubeScreamer, the TS 808 version but instead of using the two 1458 chips I am using a single JRC 4558 dual OPamp. I have chosen some different values and materials used to make it less shrill and a whole lot smoother. Some of these include Wima caps, Elna Similc II electrolytic output cap, Carbon comp resistors, 2SC1815 Transistors and some added caps to smooth the output even more. The tone knob also for me didn't have a lot of headroom, so some adjustments there to give a wider band of tone shaping. This has 3 clipping modes, I also was inspired from another OD pedal I played a few years ago made by a fellow that I really liked and thought I would incorporate in this pedal because they offer a lot more flexibility w/o having to take up much space at all. You have a Zener diode clip that provides a smooth and more modern clipping. Then the JRC4558 itself being clipped (original TS808 clipping) which sounds much bigger and because of the style of caps and more high roll of values I've chosen is very tubish and has an excellent tail, the distortion/overdrive doesn't just disappear as the amplitude falls below a certain level, this makes it seem very real as well. And finally, an LED clipping section which is a lot like the TS clipping but is a bit less aggressive and even more tube sounding. I'd like to see if anyone would be interested in doing a group buy, I could bring my prototype with me to Randge for folks to hear, obviously if he would be ok with that and Jeff as well. I don't want to set this up on Gdiy or anything, just among us RGO folks, and, if this goes well then I might design some more pedals by request and put my own little spin on them and such. Let me know what you guys think, and if it's something you might want to do. Thanks!! Jerome |
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Post by jcoutu1 on Jan 31, 2015 6:30:43 GMT -6
Hey fella's, I was going to stick this in the Guitar forum, but it really needs to be in the DIY section. I've designed an OD pedal that is absolutely just amazing. I took all the things I liked from various pedals and I came up with a very basic but absolutely amazing Overdrive stomp pedal. My prototype is built from prototyping board and such but I am looking to get a run of PCB's to condense the size and to make it more reliable. First off, it's original circuit is derived from a TubeScreamer, the TS 808 version but instead of using the two 1458 chips I am using a single JRC 4558 dual OPamp. I have chosen some different values and materials used to make it less shrill and a whole lot smoother. Some of these include Wima caps, Elna Similc II electrolytic output cap, Carbon comp resistors, 2SC1815 Transistors and some added caps to smooth the output even more. The tone knob also for me didn't have a lot of headroom, so some adjustments there to give a wider band of tone shaping. This has 3 clipping modes, I also was inspired from another OD pedal I played a few years ago made by a fellow that I really liked and thought I would incorporate in this pedal because they offer a lot more flexibility w/o having to take up much space at all. You have a Zener diode clip that provides a smooth and more modern clipping. Then the JRC4558 itself being clipped (original TS808 clipping) which sounds much bigger and because of the style of caps and more high roll of values I've chosen is very tubish and has an excellent tail, the distortion/overdrive doesn't just disappear as the amplitude falls below a certain level, this makes it seem very real as well. And finally, an LED clipping section which is a lot like the TS clipping but is a bit less aggressive and even more tube sounding. I'd like to see if anyone would be interested in doing a group buy, I could bring my prototype with me to Randge for folks to hear, obviously if he would be ok with that and Jeff as well. I don't want to set this up on Gdiy or anything, just among us RGO folks, and, if this goes well then I might design some more pedals by request and put my own little spin on them and such. Let me know what you guys think, and if it's something you might want to do. Thanks!! Jerome Let's hear it. Give us a YouTube video or something. Let's hear the clean signal the kick on the OD. Let's see it walk the walk. |
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Post by jeromemason on Jan 31, 2015 12:45:24 GMT -6
Phhhhhh I'll get someone that can play to do that!  |
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Post by svart on Jan 31, 2015 12:56:15 GMT -6
I'm interested. I always have folks around who love distortion pedals. I could probably sell a handful if they are as good as you say.
My favorite od pedal is the White Light if that tells you anything.
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Post by Randge on Jan 31, 2015 15:38:18 GMT -6
Bring it, Jerome! I have several nice ones to set it up next to for comparison.
R
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Post by sopwith on Jan 31, 2015 18:17:43 GMT -6
Definitely interested in this, let's hear some clips!
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Post by jcoutu1 on Jan 31, 2015 18:41:58 GMT -6
Phhhhhh I'll get someone that can play to do that! I want to hear clips of someone that can't plan. Then I can get a true feel for how I'd sound. Haha. |
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Post by jeromemason on Feb 1, 2015 2:54:32 GMT -6
Lol... well then I'm your guy... I'm good at rhythm tracks and that's about all, I can keep tight as hell when stacking, but when it comes to solo's and shit, nope, outta my ability.
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Post by jeromemason on Feb 2, 2015 2:56:51 GMT -6
I've got a couple of days free, if Randge isn't too busy I might ride over and at least take my prototype there, maybe my homebuilt tweed deluxe too, Randy has some killer amps tho. Be interesting to see how the new 526 would sound on OD guitars... |
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Post by Deleted on Feb 2, 2015 15:30:01 GMT -6
Hi jeromemason, Just read your post with interest, even though i am not a guitar player, and stumbled upon you mentioning the carbon composite resistors. In a low voltage application like a pedal (without tubes) it should not add any of the mojo they are hyped for, just (a bit of) resistor noise, which is not really desirable. AFAIK the mojo comes mostly from the voltage dependend resistance variation (that should need a much higher voltage swing to have any effect) and resistor distortion, that was higher in the old days than in modern CC resistors, and that needs also more than the few volts in a screamer-like pedal to become audible. Please take this just as a side comment, i am pretty sure, your pedal would sound marvellous regardless of this resistor choice! BR, Martin |
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Post by jeromemason on Feb 2, 2015 21:20:19 GMT -6
Hi jeromemason, Just read your post with interest, even though i am not a guitar player, and stubled upon you mentioning the carbon composite resistors. In a low voltage application like a pedal (without tubes) it should not add any of the mojo they are hyped for, just (a bit of) resistor noise, which is not really desirable. AFAIK the mojo comes mostly from the voltage dependend resistance variation (that should need a much higher voltage swing to have any effect) and resistor distortion, that was higher in the old days than in modern CC resistors, and that needs also more than the few volts in a screamer-like pedal to become audible. Please take this just as a side comment, i am pretty sure, your pedal would sound marvellous regardless of this resistor choice! BR, Martin Yeah for sure, a lot of folks don't use them in high voltage anymore because of noise in those setups, seems like everyone wants the foil or metal films these days, but I've always been more comfortable using the CC resistors for some reason. But you're very right, a lot of the mojo and sound I'm getting comes from the chip and transistors, the Elna's and Wima's I like a lot and for sure make a difference because I've built about 5 different versions of this with different types of components and this is the mixture I liked the most. I've always liked what a TS 808 did, but never could get passed the harshness and also the OD tail.... took me a while to make it so this responded to amplitude like an amp when overdriven, no easy feat. Not sure if I mentioned it, but I think folks will be really surprised by how much this can go from a little grit (bluesy) to overdrive (countryish/southern rock) and then just flat out sizzle, it's really versatile. |
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