Low-cost active D.I. box

About me:

Hi, I’m an electrical engineering student at the University of California. Currently, I’m working on projects relating to health monitoring wearable devices. My research area is about developing non-invasive biosensors such as glucose sensor and heart pulse sensor. My hobby is working with audio system.



About this project:

As we all know, when routing a long-distance audio cable using a common guitar jack, which is in the form of Unbalanced, the resulting signal may cause a loss or drop of the signal. D.I. box, or direct injection box, is a device that converts the signal from Unbalanced to Balanced signal so we can wire the audio cable over long distances minimising the loss of signal and preventing interference from unwanted signals to achieve good sound quality. This project is to build a low-cost active D.I. box circuit based on TL072, a low-noise JFET-input op-amp, but achieve a studio quality sound. The power is supplied by 48-volt phantom power from the XLR output that is delivered by the audio mixer.


Features:

  1. 1 input channel (TRS)
  2. 1 link (TRS)
  3. 1 output (XLR)
  4. 48v phantom powered/ 9v battery
  5. Studio quality sound
  6. Overvoltage protection
  7. Power filter circuit



### Words to PCBWay ###

I have ordered PCBs from PCBWay for almost all my projects. PCBway provides high-quality PCB manufacturing for an affordable price. Surely, all my future project's PCB will be ordered from PCBWay!

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Oct 08,2020
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  • Can I buy some of this??

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  • Hi. is there a way the get the gerber file and the bom?

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  • Hi Luis, We have a project for small active dibox with out TRS and XLR connectors. Could you help us about that? Please contact me as soon as possible. ozguryenicirak@gmail.com

    Reply
  • Hi I’m a musician and I dabble a bit in Electronics as well and I had a question about a possible pedal idea.... I was wondering if there was a way to build an “effect replicator” which would basically a pedal of some sort that you can connect a dry signal (guitar) to as well as the same dry signal going through some effect processor, whatever it may be, and this effect replicator would analyze the difference between the two signals and then be able to imitate that same effect without the existing effect pedal being used. I hope that makes sense. In any case, it would be awesome if you could help me with this dilemma. nickjmyer@gmail.com

    Reply