DIYEFI.org Forum

oxygen level adjustment. So if you know you're in an area with 20% O2, vs say Japan with less then 15%.

The devices we will be wanting to use are internally current limited by measuring the potential across the silicone substrate. I don't think I need to draw it, it is simply a current limiting series resistor from the processor output to the gate input solely to limit current to the CPU pin and prot...

With the inductances you have stated there is quite a hefty inrush current that is used to build flux within the injector core, at this point the inrush current traveling around the circuit causes lots of power dissipation in all of the connecting paths, this causes further delay in the injector op...

Perhaps you can scratch something on a napkin then scan it. Where is the resistor and what value. I'm picturing the resistor as a current sense resistor, so around .001 ohm. Is peak and hold important? I was picturing perhaps two IGBT's side by side, on for massive current draw, the other with a ser...

I found some interesting stuff about injectors. High impeadance injectors have an inductance of around 20 to 30 mH. Low impeadance injectors are around 3 to 10 mH. EDIT: both below links where the same, I corrected the below this line. http://sonic.net/~mikebr/ecm_555/inj_inductance.html and here ht...

Lets add this to the list fairchild ISL9V2540S3ST and FGB3040CS The FGB3040CS has current sensing capabilities, however the ISL9V2540S3ST offers a more standard package allowing for alternate sourcing. Perhaps pads can be placed for both chips? Is there a preference for one or the other, or a prefer...

Some potentail points of interest. You don't need the max chip for PC serial. I know that EIA 232 specifies the gray region below 0V but I haven't found an application yet where about 3v wasn't already well out of no mans land. Often you can simply use a tansistor to send data. For those that want t...

Jared, most software is free as in beer, but only some is free as in speech. Qucs is both :-) Great, I read a forum post where some one claimed different. I probably should have confirm that. Glad to here it is free. I don't see IGBT's in the list of premade parts. I wanted to model some of the cir...

Found some good stuff about IGBT's here. Sounds like a handful of folks here know quite a bit about IGBT's but they are fairly new to me. I'm reading the basic and basic 2. They include circuits with fly-back, that I think are perhaps the best I've seen so far. http://www.fairchildsemi.com/apnotes/a...

I'm curious what folks might prefer for spice? I see fedora core comes with ngspice, but it looks kind of hard to use at first glance. Also I'm not sure how portable it is. I see sourceforge has a win32, but I don't know what the ngspice-rework means. There is also http://qucs.sourceforge.net/screen...