Effect pedal or passive DI box?

[uk_lefty]

4 hours ago, rmorris said:

Was the sound / noise a problem with the BDI21 in bypass ? What was it plugged into ?

Yes. And it was plugged in to an isolated power supply. It's all irrelevant now anyway. Even without the noise I didn't like the sound.

[rmorris]

32 minutes ago, uk_lefty said:

Yes. And it was plugged in to an isolated power supply. It's all irrelevant now anyway. Even without the noise I didn't like the sound.

Understood. But it seems the unit was faulty. In bypass it shouldn't have a "sound". It's simply a high impedance op amp buffer direct to a balanced output circuit in parallel with an unbalanced output.Assuming output taken from XLR then there shouldn't be a problem unless it is connected to an unbalanced input (due to the topology of the output stage where one leg gets tied to 0V albeit via a build out resistor). Alternatively the internal jfet switching might have been faulty.

[uk_lefty]

12 hours ago, rmorris said:

Understood. But it seems the unit was faulty. In bypass it shouldn't have a "sound". It's simply a high impedance op amp buffer direct to a balanced output circuit in parallel with an unbalanced output.Assuming output taken from XLR then there shouldn't be a problem unless it is connected to an unbalanced input (due to the topology of the output stage where one leg gets tied to 0V albeit via a build out resistor). Alternatively the internal jfet switching might have been faulty.

Regardless of the noise, I didn't like the sound it was supposed to make! 

 

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