Tuesday, 25 February 2014

Mid-Fi Electronics Demo Tape Fuzz

Request.  Info about the original which I think is a great sounding fuzz:

created to recreate the sound of a guitar playing directly through a 4-track cassette recorder, the Demo Tape will bring you back to your 4-track days. spatty supersaturation and harsh to thick and full, the Demo Tape comes equipped with a two band EQ, volume and trim for simple, versatile and practical tonal shaping. four controls are Bass, Treble, Volume and Trim.






48 comments:

  1. This sounds cool, what IC is that?

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    1. Weird, I added the IC text but must have cropped it off the bottom or something. I'll add it now. JRC4558 by the way :o)

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  2. The demo sounds too good to be true, had anyone tried this pedal yet?

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  3. Reminds me of overdriving my Yamaha 4 track. The guy in Medicine is famous for using that same overdriven Yamaha 4 track as his main tone, both in the studio and live on stage. I saw them play once and there it was sitting on his amp and the LEDs were pegged in the red. I wonder if this circuit was taken from a specific preamp on a specific tape deck or just made up to sound like it...

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  4. I'm definitely gonna build this one tonight! That demo is incredible, and as long as it gets 3/4's as good as it, I'd be happy with it! I might even work on making my first pretty enclosure for this one!

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  5. Just built this. Sounds amazing! Cleans up really well with the volume knob. Tag it!

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  6. What a great sounding pedal. Need to build this. Thanks for the layout!

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  7. Any chance of the schematic location?

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    1. Of course! What was I thinking :)

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    2. Just built this this up and it sounds like it might be my perfect fuzz. The tone stack is really good, with loads of great tones available. High gain is good, but it's right down the other end of the gain knob where this thing really shines.

      If you are looking for a pedal to get great Lo-Fi Pavement style tones, or are a fan of The Gun Club or anything Alt-Country, you NEED this pedal.

      Just one issue though - mine is insanely loud. I don't think I have made a mistake anywhere, but I get unity gain at about 8 O'clock on the volume pot. Anyone else's build hve the same issue?

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    3. Where's the FSB thread? Sorry, new here!

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  8. I think that's normal. I used a log pot instead of linear for volume and treble, and a log taper means the most useable settings are closer to 12 o'clock.

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  9. Thanks for that nocentelli, I will give a log pot a try.

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  10. I built this one the other day. I like the tone stack, but for me, its distortion isn't my cup of tea. i'm generally not a fan of opamp distortion, and this one reminded of that.

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  11. Built this the other day . It's very cool pedal. 3 row span resistors are a pain and some of the caps were very tight but it was a successful build. I etched an enclosure and boxed it up. This was my second pedal. The text is black but on the picture it looks purple. I wanted to have it look like handwritten labels like the old tapes but next time i am going to just etch the labels too. http://i.imgur.com/7ziOXv1.png

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  12. i just built this and i have a strange problem, everything is working except the gain. the volume, treble, and bass work but the trim is just acting as a second volume control. any idea what would cause this? i've gone over everything a couple times and everything seems to be in the right place and nothing is being grounded out that shouldn't be.

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    1. Did you find the solution to that problem?

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  13. I need some help...where is the output??? Thanks!!!

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    1. And trim 1? I almost finish building it

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    2. The output is shown in the notes. The Trim pot is used as a variable resistor so only two lugs are needed. You could link 1 and 2 if you want but it isn't necessary.

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  14. How can I connect a DPDT switch? Is this correct? http://www.guitarristas.info/foros/enseno-como-conectan-switch-3pdt-dpdt-identifi/226119

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  15. Yes it is the same as here.

    http://tagboardeffects.blogspot.hu/2014/01/millennium-bypass-2.html

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  16. Do you reckon a tl071 would make an overly huge difference?

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    1. TL072**** Further reading, I found out most of the newer versions of this pedal have TL072's. Just in case anyone else was wondering!

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    2. Yeah, I've used both chips on this - I prefer the TL072 myself.

      BTW are you Fuzzdog of Pedal Parts UK fame?

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    3. Nope, never heard of him/her! May have to change it!

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    4. in case you use a TL072, would the components change? I have one here but I must admit that I am a newbie.. just built one pedal yet.

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    5. Hye guilherme Ri, nope the parts will stay the same. The JRC4558 is a dual opamp (has two channels), so any dual opamp will in theory work such as TL072, NE5532 or if you want to blow some dollars on 'mojo' try a Burr Brown OPA2134PA. You may find they change the sound in slight ways, or in the case of TL072 it may actually reduce some noise (if that's what you are looking for). Best thing to do is to socket the IC and just try a few dual opamps in there. JRC4558s have a perceived ol' school mojo factor and appear in a lot of pedals, but you can change 'em. Have fun!

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  17. The top left link is in the wrong spot in the links and cuts picture.

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    1. It is but only requires a small shuffling of resistors. The connections themselves are unchanged

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    2. Wouldn't you just move the link over one to make it the same as the component layout?

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    3. You could, and I'd do it too but I tend to do cuts and links first (work from lowest components to tallest components) so I would probably have put the link in the position shown on the bottom pic before realising its not the same on the top. It would be a bit of a surprise but nothing you can't work around.

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  18. I´ve just got an empty 1590b Rockett "blue note" enclosure and a bunch of 4558 variants, so this seems like perfect for it.
    The enclosure has 4 holes for pots and one for a switch, so any idea of what I could switch inside the circuit? Maybe a couple of diodes on a smart place...

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  19. I know this is an old thread, but thought someone could point me in the right direction.. Fuzz sounds great, I love it but the trebles and bass controls do nothing. I have used resistors in series to get close to the correct values for the 10Ks and 3.6ks. So in my build the 3.6k is ~3.69k and the 10K are ~10.2K. Is this going to be the problem? Or should I look for something else? Thnaks in advance and thanks for a fantastic site!

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    1. Hi, I don't think the resistors in series is a problem at all, and being less than 5% off with any of the resistors should not make any noticeable difference. I'd say it's something else. I guess, try double checking the pot wirings. One problem I often had often is accidentally making tiny contacts between tracks when soldering the wires. Hope it helps

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    2. Thanks a lot for your reply. I had checked those things but then realised I left out a resistor. duh! Slightly embarrassing. I agree with your post below, I was hoping to get it a little more Lo-fi but I love it anyway.

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  20. Awesome pedal! Sounds crunchy and slightly broken down. What really shines is the separate Bass knob that can make it much fatter. You can dial some very familiar tones. The Trim knob can push a big distortion, which is cool, but I expected it would control the lo-fi'ness instead. Anyway, well worth building, it's really one of my favorites now.

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  22. Aha, I used to use my Tascam 4-track for distortion too! Great idea to put it in a pedal. One question -- if I'm using tantalum caps for the 1U values, which way do they face? I tried to track the paths back from ground, but want to be 100% sure. Thanks.

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