DOD FX65 IC's confusing pin layout (MN3007 and MN3101)

[Nikenzzy]

Hi, i am currently drawing DOD FX65 schematic in KiCAD and i am confused about MN3007 and MN3101 GND and VDD pins. Looking at the original schematic, both ICs' GND pins are connected to the power rail after the R4 (51 ohm) resistor and both VDD pins are grounded. Shouldn't this be reversed? I looked at an older revision schematic as well as DOD FX60 and it occurs there also. Is this an error or is this intentional?

[Rob Strand]

Hi, i am currently drawing DOD FX65 schematic in KiCAD and i am confused about MN3007 and MN3101 GND and VDD pins. Looking at the original schematic, both ICs' GND pins are connected to the power rail after the R4 (51 ohm) resistor and both VDD pins are grounded. Shouldn't this be reversed? I looked at an older revision schematic as well as DOD FX60 and it occurs there also. Is this an error or is this intentional?

The MN3007 series devices are like a positive ground device whereas the MN3207 series devices are like a negative ground device.    For this reason the *chip* pins in the datasheet and most schematics looks reversed on the MN3007 series.

When in doubt it's best to compare against something you know works.  For example DOD FX65 VS Boss CE2

[Nikenzzy]

oh, ok i understand. Thank you very much.

[jorg777]

PMOS is made in Bizzaro-world.

[amptramp]

Maybe when we, the members of DIYstompboxes, finally build germanium valley, we might have PMOS gulch, an offshoot building BBD's that can't be found new anymore.

Then again, we still have all the technology used in CCD cameras.  Maybe Dalsa would consider making a camera chip with an electrical test input and external oscillators for variable delay so we could get modern performance with the equivalent of BBD functionality.