Two ART DIOs, modded as per the instructions that were on the web a few years ago.
Both have the power supply, capacitor, and opamp mods.
One has the resistor filters in the output opamp changed to a Bessel filter. The other has no changes in this section of the circuit.
No power supply, you will need to provide that.
USD100 plus postage from 2106 Sydney AU, or make a silly offer and I might just take it. Just need to get things out of here / off my plate.
