Hi all
After trying out the VEMS ETC expansion board, and found out that it is a P channel FET driver (+12V switching), the p259, ignition and injector output's are N channel (negative switching). So using the ETC board require a different wireing to all the loads.
So I have made my own P259 amplifier, with N channel FETs IRF640N like in the injector drivers, with 5 channels to amplify the 5 outputs from the EC36 connector (not amplifing the tacho, but the remaining 5)
Further did I include a 12V to 5V usb DC-DC converter to power the Airconsole Wifi->RS232 adaptor. And the airconsole is actually a great vems device, enabling both bluetooth and wifi connection. The wifi runs stable at 12-14 Hz in vemstune. And no cables needed :-) power on the car and sit at the workbench with a cup of coffee.
I have 30 spare pcb's if you are interested.
The amplifier simply need 12V+, GND the 5 wires from the EC36 P259 outputs, and have 5 Amplified outputs. I'll make a schematic if you need. installed in a small Vems'like casing, with a EC18 connector.
And now i have full protection of the p259, with 5 aditional 10A outputs. And the board is made so it can be used for high side FET's as well (12V switching), so can be quite usefull for other installs where you want to use the car's existing relays for fan, pump etc. if the are 12V switched. The board have schottky diodes that will protect the FET from relay transients. So no need for protection diodes on the relays any more, also making installs more easy.