Vintage Revolution - Pedal Pro

[massi1234]

Massi, wat is de reden dat je geen input op de front hebt?

Very good question. In fact the first prototype was with the jack in front
The straight answare is to avoid digital coupling to the guitar signal.

Many people who are used to digital processor or digitally controlled devices experience a little noise while playing and simultaneusly changing a parameter on the display.
Some people call this noise glitch, some zipper noise. I call it cross coupling between the digital and analog.

The real problem is the output impedance of your guitar pickup. Since the coils (single/double) have the impedance much above 1K Ohms, noise (hum, sparkle,....) and other sources (Eg. digital switching noise from data communication in the effect or in the MIDI in) can add on the guitar signal easily.

Since one the key feature of the PedalPro is to assign any analogue parameter to an expression pedal, it would be a petty if you would hear a little noise while you are changing the expression.

Inside the PedalPro, the analog section is fully shielded by an internal metal wall. This feature provide isolation beween digital and analog above 130dB. Therefore not audible
So the input and output jacks are inside the analog section as well as the rest of the audio circuits.

In this picture the top board have been removed so to show the input and ouput connections.


Of course all the sensitive points where noise can get in, need to be properly designed/taken-care including shielded cable (ADES), linear power supply for both Pedalino and Power supply.


We do leave in electromagnetically polluted world (WI-FI,RF....) and unfortunately the guitar is not the best instrument to guarantee proper immunity.