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Thread: Big Muff in Small Spaces

  1. #36
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    Quote Originally Posted by elipsey View Post
    I'm not sure about that. You might try shopping around for water slide decal sheets and see what the instructions say. Ink-jet printers are cheaper and more common than laser, so maybe you could print it at a friend's house. By the way, you might want to print it on regular paper first to check the sizing and fit. My sneaky printer automatically re-sized the image the first time I printed it, which wasted some decal stock.
    Oh, I understand... And there aren't any others methods? Maybe simplier?

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    Quote Originally Posted by elipsey View Post
    Yes, it is true bypass. I used a 3PDT switch from Small Bear Electronics.
    Could you tell me please if this wiring is true bypass? And if it is correct at all :'D
    Thanks

    Click image for larger version. 

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  3. #38
    Senior Member elipsey's Avatar
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    Quote Originally Posted by Dave99 View Post
    Could you tell me please if this wiring is true bypass? And if it is correct at all :'D
    Thanks

    Click image for larger version. 

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    I think that would work, if I understand the diagram correctly. If the effect input on the PCB is never disconnected from the jack tips, it could effect your bypassed tone a little bit.

    Please read this: The Ins and Outs of Bypassing Effects
    and then look at these bypass schematics: http://www.tonepad.com/getFile.asp?id=76

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    Quote Originally Posted by elipsey View Post
    I think that would work, if I understand the diagram correctly. If the effect input on the PCB is never disconnected from the jack tips, it could effect your bypassed tone a little bit.

    Please read this: The Ins and Outs of Bypassing Effects
    and then look at these bypass schematics: http://www.tonepad.com/getFile.asp?id=76
    The 5th wiring on the file you linked me is the same I did so I think it could work Thank you anyway

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  5. #40
    Old Timer J M Fahey's Avatar
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    Quote Originally Posted by Dave99 View Post
    So I can't do it with a laser printer? I don't have a ink jet...
    1) Ciao , quasi paesano
    2) yes you can, but the only colour available is black .
    For the simplest/cheapest option you can print on sticky paper, some shop which makes stick on labels can sell you a single sheet.
    If possible, get the glossy one (like magazine covers or good colour magazine paper) instead of the flat/dull one (similar to regular printing paper)
    It's a very cheap paper, get 4 or 5 sheets or , more probably if you get it at a printing shop, they might only have the size *they* use, think a fully open newspaper size , you cut it to A4 size.

    You stick it to the pedal front panel, (avoid air bubbles) , then you lightly spray it with transparent varnish, similar to Krylon.

    Or you might design a coloured front panel, and have it printed on self adhesive paper or vinyl at a shop with a "Plotter" ; they are not actually Plotters but large inkjet printers but the old name stays.

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    Juan Manuel Fahey

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    Ma sei italiano anche tu? Ahahah
    Anyway, I think I'm gonna print is with an old inkjet I've got in my father's office.. I don't want to damage my laser printer (I read the paper may fuse...)... Thank you anyway

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    I think that water decal paper for laser printer is available without any problems: Laser Waterslide Decal Paper . I was buying it from amazon UK: http://www.amazon.co.uk/Laser-Printe.../dp/B006EITEIQ
    If you have color laser printer, you get color printouts.

    Mark

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    Hey, I have another question
    Can anyone tell me if the voltage on a cap is the max or the working one? For example, C10 (in this schematic) is a 470pF ceramic cap, but I can't find a 9v one! I only found a 500v one, will it work or not?

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  9. #44
    Old Timer J M Fahey's Avatar
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    Yes, of course.
    It can stand 500V, you can apply anything up to 500, with 9V you won't even scratch it.

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    Juan Manuel Fahey

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    Lifetime Member Enzo's Avatar
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    It is like a step ladder rated for 250 pounds, it doesn't mean you HAVE to weigh 250 pounds to climb the ladder.

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    Education is what you're left with after you have forgotten what you have learned.

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    But there won't be "audio problems"? I mean, the quality of the sound will be the same?

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  12. #47
    Old Timer J M Fahey's Avatar
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    No, not at all.
    That rating in a way is a guarantee of consistency, it might even not be possible to make them in a lower voltage value

    Ceramic caps are basically made out of a disk of ceramic material, with some metal deposited on each face.

    Capacitance will increase with surface, and decrease with separation (ceramic disk thickness).
    Here's a common 0.1uF x 50V ceramic capacitor.
    Size? ... around 10mm diameter
    And what does 50V mean? ... that the ceramic disk will not be perforated even if you apply 50V DC to terminals.


    Now if they wanted to make a 50V cap, same ceramic material and thickness, but value 470pF , some 470/100000 ~ 200 times smaller, it will need to have 200 times less surface, which means ~15 times less diameter .
    The cap should be 10mm/15=0.67mm diameter .
    Not impossible, and maybe some SMT caps are that small, but very impractical, definitely so for through hole or hand applied parts.

    Now you know that a generic 470pF cap is around 5 mm diameter.
    How do they achieve low capacitance if the diameter is so high?
    Math says it should be around 0.025uF or so (in fact there are such capacitors that size) .
    What they do is alter the other parameter: they increase ceramic disk thickness to achieve lower capacitance.

    Does it have another side effect?
    Yes, it will increase voltage handling ... big way
    There you have it.

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    Juan Manuel Fahey

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    Really thank you for explaining me

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    Old Timer J M Fahey's Avatar
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    Some examples of what you can achieve printing (or having them printed at a Graphics Shop) on self adhesive paper/vinyl.

    Maybe you were thinking something simple like this, what you can get on a home laser:


    Boutique (there called Handmade) pedals are BIG in Brazil, because customs tariff is high (good for them, they protect local work) so there's literally hundreds of young Musicians making pedals on the kitchen table, they use this method because of small scale of production, but they became VERY creative:








    for more ideas, visit:
    https://www.google.com.br/search?q=p...IVxg2QCh3oSwe4

    there's even a bunch of guys which use only sardine (or tuna) cans:




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    Juan Manuel Fahey

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    Hi,
    Would these 1N914 Vishay, diodes, diodi DO-35, 10pcs. | eBay diodes work on this pedal? I'm not so good at electronics and I'm not sure...
    Thanks to everyone

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    Also, for resistors I should use 1/2w for each + 1w for the 100ohm ones... I use this formula:

    watt = [9v(power) / 100ohm (for example)] * 9volt = 0.81w --> so at least 1w...

    Am I right?

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    Senior Member guitician's Avatar
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    Click image for larger version. 

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    Thanks!
    And what about the diodes?

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    Could anyone tell me please?

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  20. #55
    Old Timer J M Fahey's Avatar
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    Quote Originally Posted by Dave99 View Post
    Also, for resistors I should use 1/2w for each + 1w for the 100ohm ones... I use this formula:

    watt = [9v(power) / 100ohm (for example)] * 9volt = 0.81w --> so at least 1w...

    Am I right?
    No, because you are not dropping 9V across that 100 ohms resistor, but about 1V or less.
    Had a quick look and you can build that pedal with 1/4W`resistors, some of them 1/8W go figure.

    You chose a very small enclosure, you will never ever fit 1/2W , even less 1W resistors there.

    As of the 1N914 diodes, as long as the part code matches (it does) , they will work as expected.

    EDIT: practical example.
    The resistors which dissipate most are the ones which have high voltage end to end and high current (so they have low resistive value), in this case the 12k resistors drop roughly 4.5V .
    P= V^2/R= 4.5* 4.5 /12000 W=0.0017W = 1.7 milli Watts

    The 100 ohms resistors dissipate 120 times *less* than that, we are talking micro Watts.

    So I confirm that even 1/8W resistors are fine.

    We use such large sized ones simply for convenience, smaller ones are not common and are hard to see or use; they do appear , though, inside ICs.

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    Last edited by J M Fahey; 08-14-2015 at 08:09 PM.
    Juan Manuel Fahey

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    SO I can buy all 1/8W resistors? Or 1/4 is better? I think I'm gonna use a 12x10cm chassis, not the one reported above so I've got a bit more space...

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    If you are going to build any other projects in the future, I suggest that you buy basic 1/2 watt resistors. They usually are the cheapest, the easiest to find and the most commonly used in all guitar pedals.

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    Yes, think I'm gonna build other pedals I'm now building my first pedal and my first guitar (strato &#128525 and music is something I really love One other thing: if I'm not able to find 1/2watt resistors, it's better to buy 1w or 1/4w?
    Thanks and happy building to all

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  24. #59
    Supporting Member eschertron's Avatar
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    Quote Originally Posted by Dave99 View Post
    SO I can buy all 1/8W resistors? Or 1/4 is better? I think I'm gonna use a 12x10cm chassis, not the one reported above so I've got a bit more space...
    I've got a whole bunch of 1/4W resistors in my (hobby) stock. But only because they were a steal when Radio Shack took a shat. I'll grab one if I need an odd value that I don't have in the 1/2W resistors that I have [after calculating the dissipation expected, of course!]. In addition to having higher power ratings, the 1/2W units will have a higher voltage rating and a lower self-noise rating. Neither of those things will probably amount to beans in a 9vdc pedal, so 1/4W or 1/8W - as Juan states - may be more expedient. But generally, 1/2W are 'more' standard and will be more useful if and when you do high-voltage work.

    edit: and I'm getting old enough that the smaller the resistor, the harder it is to read the color codes, so I'd go with the largest package (resistor size) I could get

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    If it still won't get loud enough, it's probably broken. - Steve Conner
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    Then, I would suggest the 1/4 watt if they are available. They will be usable in more things than the 1/8 watt.

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    Hmmm. Let's play "what if".

    What if the electrical circuits other than the pots, switches, jacks, and so on were **zero** size. That is, all you have to do is set up the controls, switches and jacks so they're usable.

    Now how big is it?

    More importantly, how far apart do you have to put two of them to be usable?

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    Amazing!! Who would ever have guessed that someone who villified the evil rich people would begin happily accepting their millions in speaking fees!

    Oh, wait! That sounds familiar, somehow.

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    Hi guys, last question, I hope
    Can I buy these transistors instead of these? They cost so much..!
    Thanks

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    Can't see my posts if I write from the laptop so trying to write from cell :/
    So, my last question I hope
    Can I use these transistors instead of these? They cost so much...
    Thanks

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  29. #64
    Old Timer J M Fahey's Avatar
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    You are mixing the zuppa with l'insalata , absolutely different transistors, the first one is Silicon, the second one is Germanium.
    Please post the actual schematic of the actual circuit you'll build.

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    Juan Manuel Fahey

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    Exactly the one in post 4..

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  31. #66
    Old Timer J M Fahey's Avatar
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    Ok, then the 2N5133 is what you should use, by the way it's what the schematic asks for.
    I wonder why you would even *mention* the Germanium PNP OC75 which will never ever work there.
    That said, not even the 2N5133 is necessary, *any* NPN general purpose transistor will work there (Silicon of course) , such as BC547B .
    Just for safety download both datasheets and check pinout which *might* not match.
    And you'll get them anywhere for about 0.25 €

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    Juan Manuel Fahey

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    Where?! I searched around (Udine, in Friuli, and near) but I cannot find those transistors! On the net I only find the vintage ones, which cost so much! Found on aliexpress 11$ for just a couple (delivery excluded)!
    Anyway, talking about the diodes, someone above said me that I have just to check the code on it and it'll be ok, but on the schematic in post #4 I can read "silicon diodes": the ones I linked in post #16 are silicon? If not, will they fit or not?
    Thanks a lot, I know I'm nt so good at electronics (well, I don't know all the features/specs/types of the comonents...)

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  33. #68
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    Ok guys, after long time almost all the components are in a box here on my desk... Just a breadboard and the 470pF caps are missing but I already ordered them and they should be delivered to me in these days. Then the transistors! I can't find them anyway for cheap! The only ones I found were 11$ each! The cheapset I found were on aliexpress.com... Even on Parts for Electronics: DIY Guitar Kits, Instrument Knobs, Effect Pedals for Guitar & More I can't find anything!
    So if anyone find something for cheap can you please tell me? I would really appreciate that..
    Thanks and happy big muffing ;P

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  34. #69
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    Maybe this site will have something for you to order. BC547, PN3904, etc.

    and Transistors from Robot Italy

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    No, nothing... Thanks anyway..

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