www.MSgroups.com read only forum (Jan.15,2018)

I'm looking for a donor for a Fidle valve suitable for PWM operation.

Any suggestions?

thanks!

Damo.

The way you will be using the transistor is more like a switch. You simply want it to turn on or off, like a digital circuit. I believe you should go for maximium gain to keep the gate saturated, as long as the voltage divider keeps the gate below its maximum voltage. Someone please correct me if I...

Thanks Daniel. I'm trying ti figure out my resistor values now, and need the Hfe. I look on the datasheet but there's half a dozen values. I think 100 is the closest minimum value? As it says 10v and 150mA. What Hfe figure should I use?

EDIT: Added datasheet as attachment

I checked the relay's coil resistance and it's 69.6 ohms. So I calculate the current draw to be about 170mA @ 12v. So a PN2222A should handle that current no problems.

Right?

If only.... I've had a cad drawing for 36-1 wheels for a few years now ; it could have saved you some work. Also, some vr sensors don't work as well will thinner wheels - thicker seems to give a higher output voltage. Mine is 5mm, works very well. Just out of interest, could you use hall instead of...

I modified the diagram, with the diode as suggested by long283.



I'll set this up on a proto board and see how it goes. Thanks again!

Let me know if I have read your post correctly. The 12V side of the relay is switched from the ingition, and the ground side is switched through the Factory ecu. I assume this relay feeds power to the MS, injectors coils etc. If that is correct, then why not just ground the ground side and rely on ...

This is loosely MS related so I figured I am OK to put it in here. My problem comes from using the factory ECU harness for the MS install. I have a ECU connector from a dead ECU and have used that to make an adapter loom from between the stock loom and the MS DB37. Where I ran into trouble was with ...

I know the bloke, and have PM'd hime already

Actually, it's probably my fault that he is considering burdening himself with this Megasquirt malarchy

Got myself an IAT sensor today, so that's one step closer.

I have also been chatting to the laser cutter about parts a manifold for the ITB conversion. Time to brush up on my CAD!