I have a schematic diagram from a demo board for a microchip and it has resistors with values NL and 0 what do those values mean ?
If I look on the physical board the ones with NL values are missing. and the Resistors with 0 are marked 000 on them. Is there actually resistors with zero resistance and why would you have a resistor with zero resistance ?
I changed the PCB I have been modifying; the mods I made are:
I get the power from the bulk caps now, so the ground plane is connected at two places in the power chain. The ground plane is connected at the power connector and at the end of the bulk caps for the 5.0v and the 3.3v. The power plane is connected at the end of the 3.3v Bulk caps on the positive side. the positive 5.0v power goes to the jumpers where it is selectable to power the max3232e chip with either 5.0v or 3.3v so the user selects where the jumpers go depending on the application.
If a via is a pin-length away from the pin is that far enough away ? is there a rule of thumb for this sort of thing?
Any last comments on the board before I get it sent away ?
If I look on the physical board the ones with NL values are missing. and the Resistors with 0 are marked 000 on them. Is there actually resistors with zero resistance and why would you have a resistor with zero resistance ?
I changed the PCB I have been modifying; the mods I made are:
I get the power from the bulk caps now, so the ground plane is connected at two places in the power chain. The ground plane is connected at the power connector and at the end of the bulk caps for the 5.0v and the 3.3v. The power plane is connected at the end of the 3.3v Bulk caps on the positive side. the positive 5.0v power goes to the jumpers where it is selectable to power the max3232e chip with either 5.0v or 3.3v so the user selects where the jumpers go depending on the application.
If a via is a pin-length away from the pin is that far enough away ? is there a rule of thumb for this sort of thing?
Any last comments on the board before I get it sent away ?
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