DIYEFI.org Forum

Thanks Alan. Basically what I am looking for is a circuit that would satisfy the basic requirements of the wideband controller enough that the controller would report a fairly stable A/F ratio of any reasonable value without sensing a fault. I did do some more "Google"-ing and realized tha...

I need to develop a circuit that will simulate a Bosch LSU4.9 wideband sensor. It will used for basic "check for brains" testing of a wideband controller in a production environment. I thought that I would ask if anyone had any suggestions (Toalan, Hot Fire, ...) before I start getting hea...

Hi Andy,

Do you have a pdf of the current 0.6-alpha schematic?

Thanks,

Hi MrOnion,

Do you have a list of specific manufacturer's (or distributor's) part numbers for the components you plan on using for the power supply circuitry? Thanks

I politely disagree with this decision because I feel that the odds of an enthusiast (or noob) wiring even one input accidentally to battery is much lower than than the potential of this circuit to cause issues. I understand that it is not my call, I just wanted to express my concern. Though I also ...

As with any design decision, you play into statistics with it. If you're happy for 5% to require rework to work properly, then you can pick a voltage based on that and a known statistical distribution. Nope, not for automotive, we are required to prove with a WCA (Worst Case Analysis) that our desi...

Dan wrote:regulator output voltage is approx 5.02V when using correctly spec'd resistors (attention paid to tolerance)should never ever get to 5.30V.

Don't worry about specs, just call out some 10% as most of them will be quite near the nominal value.

How may parts did you measure at 0C or at 60C?
The specifications are the speciications, if you don't like them, I guess you can ignore them if you want.
Thanks,
Huff

HUH?
So "Quality" and "DIY" and "NOOB" go out the window cause we don't like reality? A 5% part was picked, if that is not acceptable, pick another part or review the topology.

Look at the first Parameter ("Reference Voltage") on page 3 (sorry, but I do not know how to copy / paste from the data sheet). So even if you use 0.01% resistors to obtain 1.275V at 5.00V, the regulator may try to regulate the output to obtain 1.211 to 1.339V at it's adjust pin. Note that...