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I'm not very impressed with the 9011. I would probably suggest a generic PGA like the MAX9939, then do the rest in software. [edit] Most knock sensor chips are reasonably blah. The bandpass filters are poor and the energy detection circuits are limited. [/edit] The HIP9011 is better but still blah. ...

Correct, the diodes will dump energy directly to the MCU pin, below the 5V regulator. The 5V regulator will pull up up to 5V, however it will not prevent something external from pulling the 5V higher than 5V. When the diodes conduct, the 5V rail will raise higher than 5V regardless of you barrel con...

That artists rendition looks very similar to some proto boards I've made :) I forgot to mention. In my schematic, the op-amp is powered by U19 on page 1. However any 5V supply would work. The op-amps reference is select-able via P20. I wasn't sure if I was going to want to use a reference diode like...

I'm a bit short on time now, so I can't comment very much. You might find this schematic handy as a reference. https://daecu.googlecode.com/svn/Hardware/trunk/KICAD_Project_TRK-MPC5634_P3-P4-ETPU_IO_proto/TRK-MPC5634_ETPU_IO-board-sch_RA.pdf Look for U26B on page 3. This op-amp allows me to create a...

I post for some consideration, the below op-amp circuit. It can be configured on installation, it will protect with out dumping to the rails. If we use less commonly found op-amps, like those found in multi meter like the LTC chip posted in the above post, we can remove most of the discrete componen...

I believe GDI pulses during combustion. VW like to advertise ultralean operation, which can only happen during combustion. However I haven't measured it so I don't know for sure. Most all of my OEM cars redline at 6kRPM. My truck redlines at something slower, I think it's still around 5.5KRPM. I ten...

For sniffing an existing connector I would like to suggest the use of wire wrap wire as shown in this video http://www.youtube.com/watch?v=8SSOKppwpAE it worked well for me a while back when I sniffed a truck I have. See below attached pictures. One pictures shows the wire wrapped on a pin. This mad...

Following the thread name, I want to start some discussion about what the minimum allowable latency is for a diesel engine. For example with the PWM style and mechanically controlled injector pumps, it's likely OK for a signal to take 1/2 of a second from the time it takes to read the signals, to th...

I knew there was a reason why I felt you were correct. I see from here http://en.wikipedia.org/wiki/Common_rail it notes "Third-generation common rail diesels now feature piezoelectric injectors for increased precision, with fuel pressures up to 3,000 bar (300 MPa; 44,000 psi)" That exceed...

I think you are flipping PSI and bar. According to this youtube http://www.youtube.com/watch?v=XK7l37LLda8, GDI produces between 40 and 200 bar. My daily driver is GDI, I see one of my VAGCOM logs shows between 60 bar and 110 bar. I think you flipped PSI and bar as 40 to 200 bars is 100 to 2900 PSI....

The price has come way down. I see this one from Hyundia has become available on the after market. http://www.jimellishyundaiparts.com/showAssembly.aspx?ukey_product=8467908&ukey_assembly=1105808 See item 35320B for the mechanically driven fuel pump $582, and 35310 the injector for $66. There is...

I've seen people use propane injection in a diesel which gets better fuel economy for a bus or large rig. I'm guessing they mean something like that.

I had once found that a 2012 Kia Soul has DI the pump that from a dealer cost something like $550, and the injectors were like $50. If found in a junk yard, that could be much more cost effective for a starting point. If the pump and injector can be obtained, it shouldn't be to hard to connect them ...

That is drafted in the IO board I made so we have that in KICAD already. It's should be minimal work to integrate that on a board.

I've had good luck with the MAX31855. I would suggest using it with a connector similar to Omega's PCC-SMP-J-5

I convert 3D pdfs like this: I get a 3D solid model in Solidworks, then I export to STL, then with Wings3D, I import .stl, then I export to .wrl. That .wrl file can be used by KICAD's 3D, however scaling and rotation is always wrong. So you have to change the rotation and X,Y,Z scales to match some ...

I've been looking to make an input circuit that can accept up to 600V. I've been stewing over the idea with a couple people. So far the best we've come up with has been modeled after an auto-ranging multi-meter. The basic concept is something like a 100 to 1 voltage divider, that then goes into an o...

I'm not sure the exact intentions of that above posted circuit, it's kind of hard to read. I see some potential issues. It appears you are using a "push" only 5V regulator, and it appears you are using shunt diodes to limit the voltage on the MCU pins. I think your intent is that if you ov...

Great to see some TFSI interests http://en.wikipedia.org/wiki/Turbo_fuel_stratified_injection. I once created a QUCS simulation that showed how to generate an 80V kick to drive a DI injector. Picture found here http://sourceforge.net/p/daecu/code/HEAD/tree/wiki/simulations/QUCS_souce_files/picture_d...

The series of Allegro chip found on this breakout board. http://www.pololu.com/product/1185

Congrats and good job. I'd bet that was fun.

http://jbperf.com/dual_VR/v2_1.html#Buy

I prefer the 2.0 board as that was a better design, however this will work for most people. I'd recommend good over voltage protection on the 5V. I had a good explanation on a forum once, however the forum admin deleted that some time ago.

Ah here we go, found the link http://www.miataturbo.net/diyautotune-miata-accessories-30/over-19-000-rpm-bench-test-60325/page2/#post771472 Money shot picture below, the yellow trace is the output of the LM1815 notice the missing pulse, when it should have pulsed. http://img401.imageshack.us/img401/...

I would suggest a bit more generic approach. The specaillity chips are good for OEM's as they save a couple pennies per ECU design, or they can make the ECU slightly smaller. However I've been burnt by FreeScale. I once designed a board that used some really nice chips. Some where protected high sid...

I can't seem to find the comparison right now, but some where the LM1815 and MAX9926 were compared against each other. The MAX was better as it's reaction time allowed for a detection of a skipped tooth wheel at low RPM. Basically the LM1815 didn't auto-calibrate quickly enough so it failed to detec...

How is this situation deal with "To return to a non-conducting state, the current through the device must fall below the ISB (approximately <50mA) and the voltage must fall below the VSB (normally 2.8 volts for a 3.3V device). If a 3.3V TVS is connected to 3.3V DC source, it will never fall bel...

I just e-mailed a file. See attached picture of the connector. It includes the PCB module with 3D and schematic symbol. I started a draft layout, however I ran out of time and I don't know the exact details you would look for. I think the files I'm sending are at a point where you can massage it int...

Typically a 6V transorber will dump significant current at 4.5 to 5V, which can skew an analog signal. Do you have a specific transorber you use? I like this buck regulator. The ripple is a bit high, however if it's set to something like 6V, then a LDO with a high ripple rejection like MAX1857 is us...

KICAD draft schematic for CJ125 chip found here https://hardware.open5xxxecu.googlecode.com/git-history/unfinished-unreviewed/KICAD_Project/O2_input_CJ125.sch

I believe the MCU pin will be high impedance, so 0mA flow through the R9 resistor, and therefor no voltage drop. If you have the same voltage on both sides of that resistor, isn't that still to high for the MCU pin?