DIYEFI.org Forum

Not surprising it gets very very hot without any heatsink hahaha. The thermal resistance of case to ambient is 62.5 degC/W according to the datasheet - so even 2W continuous will put the temp up to 125deg above ambient. Did you try it with high Z as well to compare and see how well it will run norma...

So to be CLEAR, please fill this out: v1= injector signal voltage - TTL levels so 0-5v: 0v = injector off, 5v = injector on v2= Regulated 5V v3= Battery Voltage The opamp uses +/- what voltage? Your using an auto fet to drive the injector - so either will be fine - I'd like to see it on regulated 5V...

Adding to the previous reply - I just changed the 5V source to 12V in the simulator - and it gave me

No limiting and around 6 amps for 2.3ohms
Almost no limiting and around 7.5 amps for 1.7ohms

So it might be just that but we'll see I'm sure.

Well, I might have to go recheck things.... I'm definately wondering why I saw such a change between runs. I tend to trust the first, noisey signal the most. I built it per the schematic - the V3 I ignored, the inductor was the injectors, R9? (1.2kohm) was actually a 1.0k 1% and a 220 ohm 5% in ser...

That was my original design to use PWM from software for peak/hold and on off for saturated. But Fred indicated he didn't really want to do pwm in software so I came up with this instead - technically this IS pulsed - if you stick the circuit in a spice simulator the mosfet is being driven above and...

If you could read the voltage across the 0.01ohm resistor under the protected FET that will help to determine the current going through the injector, and make sure its actually peak/holding with your injectors.

I guess I should have asked for bags of money, instead. :-) The biggest complaint is that red text in the bottom right corner.... :-) But more or sell, yeah - include a phase adjust and it'd be pretty much what I meant. Of course, I'd want to put my cam profile into the red and green lines. :-) Not...

like this?

I didn't include the common resistors. But this is a quick BOM. Um, is that PER injector? Seems so. It's in the V14 schematic? Doesn't look it. Anyway, give me something to put under "quantity" and I'll be ordering it tomorrow. Yeah its per injector, list looks good - the schematic is bac...

I didn't include the common resistors. But this is a quick BOM.