Passive Design

Passive DI Box.gif (5512 bytes)

Active Design

Active DI Box.gif (8497 bytes)

Active DI Box (Version 2)

Active 2.gif (8686 bytes)

There is a defect in the design that causes oscillation on the op-amps.

To resolve the problem  reduce the feedback resistors (100k) down to 47K and the design works 100%

 

DI_with_Phantom_supply.gif (8482 bytes)