This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Wednesday, July 12, 2017

iRig Preamp

Got several requests for this one. Basically, it's small preamp to plug into a mobile device for use with apps like iRig. Pretty simple circuit. Shouldn't be hard to fit in a 1590a or even smaller since you don't need to include a footswitch.

16 comments:

  1. Very nice, do you think i can use this circuit for an Arduino Analog input? I wanted to use a tuner program i found, and states that i need an amp. Do you have the circuit? Thanks

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    1. Don't know about the Arduino. You'd have to do some research. This is really just a pre-amp. If you need an actual amplifier you'll probably need something based around a 386 or something.

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  2. But the iRig - certainly the original one that can be found for $5 from various chinese sellers for some reason - is a jfet device?

    Schematic and discussion here: http://www.diystompboxes.com/smfforum/index.php?topic=85913.20

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  3. Hi, thank You for Your work. I think there is a little mistake: Volume2 is out, but on the layout there is Volume 2 wired to 560 ohm resistor. I think, it should be Volume 3.
    Regards.
    Guido

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    1. Yeah, that's just a typo. Volume 3 is the out.

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  4. thanks.. got my request.. how can i add a footswitch like the original irig stomp?

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    1. Just wire it like you would any other effect.

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  5. It only work with iOS? Or it's only a preamp to connect your guitar to your phone? Thanks

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    1. I believe the iRig app is on both iOS and Android.

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  6. japanese parametric eq.. please!!!

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  7. This comment has been removed by the author.

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  8. Does the output go directly to the cell phone? What kind of jack should I put?

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  9. Hi, any ideas how/where to add a headphone jack, to hear what is coming back from the device? Can't see how to do it!

    Thanks so much for all the hard work you put into this site!

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    1. From my understanding that won't work here. This is just a preamplifier and actual amplification is being done by the mobile device. So you'd need a secondary out from there.

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    2. Hi Joe

      It's crazy simple, you have to use 4 pin 3.5mm jack.
      You connect irig output to the pin that is specified for the microphone, and then connect your headphones to 2 pins that are specified for right and left channels.

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