Sonelec musique transistor amplifier
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Elektor 305 Circuits
Without even reading your description I recognised this as a jerkulator copy, quite amusing really, I mean the people who buy tend to buy these exotic boutique pedals must read on various forums that they are copies?
It's a moot point here, though because the Harmonic Jerkulator is a DIY circuit and has never been available to buy. Furthermore, Escobedo asked that his work not be used in any commercial venture Maybe the capitalised Harmonic Distortion in the description is meant as a nod to the origin. And on the other hand, Jerkulator is just a work-alike derivative of Harmonic Percolator.
From my personal viewpoint, a copy would be something with brand names in tact. Hi Guys I'm new at cloning pedals This is the software I use, but you can only do very simply PCB layouts on it for transfers.
I built this today and can't get any sound out of it. Well, there is a little sound but almost none. I am having a ton of trouble with these small circuits lately. I would anxious to see if anyone got it working. Thanks as always for all the work. It's such a simple circuit I'm pretty confident it's right. Have you included the cut between 22K resistors? What pin voltages are you getting?
I was certain that I was missing something obvious and had been looking at it too long. I figured my mistake would reveal itself after a dinner break. Built one today…i have used all the right components , but it was just not working… … it made some strange sound. I've spotted the error. The collector resistor from Q1 goes to ground, not 9V, desolder that and put it to ground and it should work. Layout updated. Yep, that change did the trick. It's not bad sounding, either. Though it's not really a fuzz sound that I was getting - more of a nice distortion at most of the Drive levels.
It becomes emaciated when you turn down the guitar volume but that happens with lots of pedals. Mark, you can mark this as verified.
I just built it, and it works great. I have a strange problem though that I think is due to a bridge or something. So what do you reckon guys, verified or wait until any bugs are ironed out in the builds? I think I did something, otherwise I think it can be verified. Do you think there's a bridge causing the gain to change the tone too, or do you think that's normal? I mean normal for this pedal. Its hard to tell in the video is it happens. I mean mine sounds really good, it's just not a fuzz.
Is it just a matter of getting more signal to one of the transistors? Mine definitely is fuzzy and nearly identical like it is in the original in the above video. Mine just has a tone change when you turn the gain from full CCW at "0" to anything above. Still trying to figure it out.
Chee, mine is very loud too, and noisey like yours with the onespot, which I think is the reason for the extra noise. At lower volumes mine is more drive then fuzz, but when you turn it up past 12 o'clock it starts to get nice and fuzzy. Definitely a keeper for me even with the oddness mine is showing. Nice and creamy, overdrive to fuzzy goodness.
Hmmm, not sure. Once I start playing with the gain I back the volume off to about o'clock and it's a good volume boost besides the fuzz. Try it and see if that works on yours. Once I change the output cap, I'll come back with a report on how much the low end improves.
So when the gain control is fully CCW the only thing stopping the entire signal from being dumped to ground and the pedal being silent is the 1K resistor at Gain 1. So it makes sense that you would have to compensate at the volume pot. So everyone's build should behave in that way or there is a build problem of some sort. That's what I figured. I didn't think that was weird, what I do is the change in tone when gain is at "0" to anything "1" and above it gets trebly.
I think it has to do with the change I made to the input cap, but not the output. What a weird bunch of differences from one pedal built by different people. Eerily so. Maybe I'll swap out the transistors because I can't think of anything else that would change the sound any. Maybe it has to do with the transistors. I could see the hfe, and quality of the transistors making a difference.
In my russian muff the hfe made a huge difference in fuzziness, output, and character of the fuzz. Been messing with this one today and I think I figured out some of the problems with mine, and possibly the layout. I changed the orientation of Q1 to EBC, top to bottom, the pedal completely changes, IE: no background hissing at all, it does not get fuzzy, and no tone change when the gain is turned CW from full CCW. In fact, it sounds pretty much dead on to the video above, just bassier since I altered the input and output caps.
I didn't see the schematic, but should Q1 be reversed? Pilt and Chee, reverse Q1 and see if that makes it sound right. Am I correct?
Not according to the trace or the Jerkulator schematic. Both emitters are definitely connected with a cap to ground. Q1 collector has a resistor to ground, Q2 resistor has a resistor to 9V, same as the Jerkulator.
You do have the latest version of the layout don't you with Q1 collector resistor to ground? Yea, it's the same layout as above. I just looked at the schematic and you're right that it should be CBE. I just checked the board and its right too, no mistakes. Why could reversing Q1 make it sound correct, as opposed to the issues I had before?
The biggest being a tone change when turning the gain pot. I swapped out the transistors same values and it is more fuzz like.
Much closer to the video sound. At lower Drives, it's a nice sounding distortion, as I stated in an earlier post. Hmm, I think my comment got lost whilst previewing it.
But the short was - built it tonight, sounds like the videos, I like it, just waiting for some a's to arrive to box it up! Cheers Simon, I think with all the responses now it's pretty safe to tag this verified. I've been playing with this one and I just haven't been satisfied with it.
I tried it as-is in the schematic and it was really noisy, it picked up radio signals, and it just didn't give a good sounding distortion or fuzz for me. I switched Q1 as suggested by Johns, and it did get rid of the noise problem but I got almost no gain out of it, even when Drive was at maximum, and it sounded terribly thin. I switched both input and output caps and it just made it muddy. So I've scrapped this one altogether and am looking for another distortion. Thank anyway Hi, I'm working pedal at a given scheme and I think it's impossible to get the effect as videu.
Radio frequencies are strong and I'm adding RF block capacitor of pico circuit collector on Q1 and Q2. I am changed to input capacitor 22 nao to 47 nano and got stronger distortion.
Noises which should be are still present. Have to agree that we're missing something withe the schematic. I've built this thing twice with different transistors, pots, and caps and still couldn't get a working pedal. Anyone else have an idea? Just finished building this.
Getting a bit of hiss when drive pot turned up but other than that its not bad. Swapped Q1 round as mentioned in previous post and it does make it cleaner Mine is more like a very mild distortion than a fuzz. Might just double and triple check everything once more just to make sure my build is correct.
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User Name Stay logged in? OP Amp based headphone amplifier. I am exploring the possibilities of making a headphone amp based around an op amp. The amp only needs to have one set of analogue. The has an output impedance of ohms. I haven't settled on a decent pair of cans yet, so the amp should be capable of a wide range of loads. Does anyone know of anywhere I can get my hands on a fairly simple circuit design, or a supplier of ready made PCB's for this purpose? I don't mind mains or battery supply either. Regards, Chris.
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Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Source: Sonelec-Musique. It outputs on a 8-ohm speaker but sound is like really, really low.
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For the last post of , I wanted to write about the making of a small power supply for 4 Korg Volca. Not only is that power supply expensive compared to the affordable Volca , but it is over-dimensioned and you end up using one per box. Moreover, Korg uses a slightly different connector than most 9V guitar pedals power supplies and the polarity is reversed positive inside. They correspond to the EIAJ japanese standard. Size is 4.
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