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Thread: Converting guitar pedal to rack unit?

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    Converting guitar pedal to rack unit?

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    Is there anything special you need to do to convert a guitar pedal to a rack unit other than the physical mounting aspects?

    Specifically, I'm talking about the BYOC analog delay. I'd love to have an analog delay in my rack for recording, but they're expensive and rare to find used. The BYOC isn't too steep, and their kits are easy to build (granted that one is more difficult than their others, but at least you get step-by-step instructions).

    Is there something you need to do to convert it to accept line-level signals, etc.?

    Sorry if this is a stupid question, but I thought it'd be worth a shot!
    famous beagle

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    It's probably fine. You might want to consider the power supply if you're worried about operating level--if you increase the voltage, you should increase headroom. But check the ratings of all components to make sure that's OK.

    Or you could stick with 9V and add a pad on the input . . . you will also not have a balanced input, unless you add a differential front-end or a transformer. Balanced output is easier, you can do an impedance-balanced out.

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    Quote Originally Posted by mshilarious View Post
    It's probably fine. You might want to consider the power supply if you're worried about operating level--if you increase the voltage, you should increase headroom. But check the ratings of all components to make sure that's OK.

    Or you could stick with 9V and add a pad on the input . . . you will also not have a balanced input, unless you add a differential front-end or a transformer. Balanced output is easier, you can do an impedance-balanced out.
    I don't mind not having a balanced input; most of my stuff isn't anyway.

    What would be involved with padding the input?
    famous beagle

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    Quote Originally Posted by famous beagle View Post
    Is there anything special you need to do to convert a guitar pedal to a rack unit other than the physical mounting aspects?
    First of all I don't know the 'right' answer for sure, but I can share with you how I did "this sort of thing". I sort of faced such situation. Actually I was 'converting' a piece of telphone line test unit into something useful, heh heh , I also wanted to try to built a guitar overdrive ala ibanez TS-808, and then I've got a few extra ideas on the way.
    The logic here would be (as I understand) - add attenuator (pad) on input ("convert" line level down to instrument level), and then ad a "guitar preamp" at output. So you have instrument and line inputs option and also you have instrument level and line level outputs.
    Here's the entire schematics of the unit I've built: http://www.mzentertainment.com/pics/...schematics.gif
    here's the control panel of the unit: http://www.mzentertainment.com/pics/...ol_diagram.gif
    Now, when you look at the schematics, ignore all the things that related to relays, VU-meter, the entire spring reverb section, headphone amp. So if you just look at Drive Section and Tone Control Section - what you see there is pretty mach ibanez TS808 overdrive, but with few mods and rather freaky drive adjust and tone control ..heh heh, but in general you can view it as TS-808 pedal: everything between first and secong sc1815 transistors (minus relays and freaky "controls" ).
    So as you see ther, I have line level input, which is two resistor pad (also I have 0.1 uF cap there instead of 0.022 for instrument input), and then after second sc1815 transistor (that's where TS-808 "ends" ) , - next you see "Output amplifier" section . I have ther one transistor, followed by "no-gain" OpAmp (it also acts as summing amp for reverb 'return' there) , and then I have Line output and two resistor pad (attenuator) for instrument output.
    Again, I can't tell you exact design that may work for you, but only as general idea.
    There are bunch of big and small issues all around, I must tell. The project may be simple but may be not ... Good luck if you do it.
    Maybe you can find some simple guitar preamp kit and then put it all together with your delay kit into one case, plus some power supply, of course.

    here's photo of 'silicon driver' :
    Attached Thumbnails Attached Thumbnails silicon_driver-jpg  
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    Quote Originally Posted by Dr ZEE View Post
    First of all I don't know the 'right' answer for sure, but I can share with you how I did "this sort of thing". I sort of faced such situation. Actually I was 'converting' a piece of telphone line test unit into something useful, heh heh , I also wanted to try to built a guitar overdrive ala ibanez TS-808, and then I've got a few extra ideas on the way.
    The logic here would be (as I understand) - add attenuator (pad) on input ("convert" line level down to instrument level), and then ad a "guitar preamp" at output. So you have instrument and line inputs option and also you have instrument level and line level outputs.
    Here's the entire schematics of the unit I've built: http://www.mzentertainment.com/pics/...schematics.gif
    here's the control panel of the unit: http://www.mzentertainment.com/pics/...ol_diagram.gif
    Now, when you look at the schematics, ignore all the things that related to relays, VU-meter, the entire spring reverb section, headphone amp. So if you just look at Drive Section and Tone Control Section - what you see there is pretty mach ibanez TS808 overdrive, but with few mods and rather freaky drive adjust and tone control ..heh heh, but in general you can view it as TS-808 pedal: everything between first and secong sc1815 transistors (minus relays and freaky "controls" ).
    So as you see ther, I have line level input, which is two resistor pad (also I have 0.1 uF cap there instead of 0.022 for instrument input), and then after second sc1815 transistor (that's where TS-808 "ends" ) , - next you see "Output amplifier" section . I have ther one transistor, followed by "no-gain" OpAmp (it also acts as summing amp for reverb 'return' there) , and then I have Line output and two resistor pad (attenuator) for instrument output.
    Again, I can't tell you exact design that may work for you, but only as general idea.
    There are bunch of big and small issues all around, I must tell. The project may be simple but may be not ... Good luck if you do it.
    Maybe you can find some simple guitar preamp kit and then put it all together with your delay kit into one case, plus some power supply, of course.

    here's photo of 'silicon driver' :
    Wow, Zee, what a project! Terribly impressive.

    Thanks for the input. I'll check out your schematics to see if I can apply the ideas to my own.
    famous beagle

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