Initial Testing and Wiring For Genboard V3.#

You find schematic and layout files on


Please put any question to the relevant page (if needed, find on SiteIndex and link from GenBoard/Manual)

StepByStepGuide page is very similar with almost the same steps, but with images.

The information from this page is consolidated in the Genboard v3.3 assembly instructions, most of it also applies to to earlier revisions, please take a look at the complete pdf [here]

Critical importance:

First of all, please check:

TODO: pics

OLD checklist (v3.0 .. v3.1)

If you are doubt which supply caps should be populated, put them all in, as big capacitance values as you have, given the voltage constraints are met. Make sure you put at least 25V caps to the 14V supply (near OPA, stepper and main regulator. The FETdriver already has supply caps on all onboard places).

Check at least C68, C96, C71, C95.

Note: you shouldn't need to soldering extra capacitors to v3.3. See "Recommended checklist" on BuildProcedures/SectionThree

You will probably need these things to start working with your new GenBoard/VerThree

Since the firmware used for GenBoard/VerThree/Testing is not cleared, it is advised that you do not erase your firmware from the AVR until the above test OK (because you add an uncertainty with that). After that you will probably want your own firmware.

More on GenBoard/VerThree/LowZInjectors and flyback:

The assembled boards since v3.1 are shipped with R154, check yourself. That is pullup to 5V. If you add the SIL5 10k pullup and 2 FETdrivers if you need more than 4 channels (2 are mounted already), the PWM option is there (and even non logic level FETs, though nothing can be as nice as the insulated FQPF FET). The PWM option is not obligatory, of course. If the FlyBack is high voltage, but low dissipation capable, configuring PWM will fry it. It can be prevented by converting high voltage flyback to low voltage Flyback: bypassing the 6.8V or 22V SMB transient protection diode, or the 10..22 Ohm resistor with a short or an SMB diode. See GenBoard/Manual/DDFlyback for information.

Batch firing can be used but is the worst idea

Setting config.alternate=01 and the h[0] table first 2 entries. But why would you load the supply (GND5) and the fuel rail unnecessarily, when you have the option to switch them at different times? To save a few wires?

Use a grounded, electrostatic-free workplace to install the PowerSwitchers?, they are a bit sensitive.

TODO: links about this; describe safe and unsafe soldering iron types

See also: