got the 10000uF Cap from the drawing you posted for the overvoltage with the zener and 10R, I printed it out
If you look at the last post/drawing I make referance to not placing the switches on the drawing like I did with the (1) mosfet design because of componet limitaions on the program. I do plan to install a set of switches with the (8) Mosfet design, my program would not allow me that many componets. There is a 100Uf on the PCB in the picture on the actual board that is built but not on the injector side of the OPTOs.
What is the 4K7 you referance to?
Drawing with just (1) Mosfet to control injectors:
https://www.electro-tech-online.com/attachments/modified_injector_with_1_mosfets-jpg.14100/
Drawing with (8) Mosfets controling injectors(note I plan to add switches across ALL the OPTOs as did in the previous drawing):
https://www.electro-tech-online.com/attachments/o2-w-8-mosfets-jpg.14101/
I hate to say it but I think the program I'm using would count a box as a componet if it would let me add it. Is there a free program I can dowload that will let me do more? Electronics Workbench Multisim 2001 Textbook Edition is what I'm using. I'll check into getting the full version. the partial drawing is the same cropped from the original posted,
https://www.electro-tech-online.com/attachments/o2-monitordriver-jpg.14051/
Yes, I can see where not having the entire drawing posted would be a bit of a pain, I'll start getting the entire prints posted, it may be a bit of a trick for me to do with being limited to 50 componets, but I'll figure out a way.
With both drawings, the (1) and the (8) mosfets contoling the injectors, the switches the theory of operation will be as follows:
System is armed when the 12V switched is closed turning the injectors ON all the time.
The LEDS light from right to left as the voltage from the O2 sensor input rises, I will leave lets say the left three OPTO switches closed, when the voltage level reaches the first OPTO with a closed switch it will cause the Mosfets to open the injector circuit. If voltages continues to rise it will still leave the injectors off, as the other two above the first will supply voltage to the Mosfets that already have 12V from when the first OPTO turned on. I'll get better at this I'm sure.
On another note, I went for a job interveiw Friday. The test given was part mechanical and part electrical. The mechanical was a small hand cranked machine I was given 10 minutes to play with then sent outside while they changed adjustments to disable it and I had to fix it, 10 minutes per problem allowed, I did the four problems in a total of 12 minutes. Then we did the Electrical, 15 minutes each allowed 5 problems given, I did it in a toatal of 18 minutes. The comment I heard one of the guys giving the test was "Rick's,
(the Department head), is not going to beleive how fast this guy did the test." When I came back in the room for the final test he asked how long I have been do electrial control wiring, I told him about a year, just what I'd learned in school and on the internet. He thought I was joking!