DIYEFI.org Forum

Here is the program I'm using to capture the signal it's very useful not just a scope but a sig gen and spectrum analyser too!

http://zeitnitz.de/Christian/Scope/Scope_en.html

The distance is dependant on the data rate. I've seen estimates that claim 100K should allow for around 28ft, or about 9m. However, I haven't found something that shows actual data rates vs distances obtained. Could also use this device to extend it if required. http://www.avrcard.com/products/can_...

Phantom powered? I assume you mean what we call electret microphones that require a supply of 1.5 to 3volts to power the internal amplifier. Piezo mics and knock sensors generate their own voltage through the piezoelectric effect. in the knock sensor the transducer is mechanically trimmed and tuned ...

No biasing is required whatsoever, the piezo element generates electricity when it is shocked or moved in the manner to which its tuned.
its used just like a microphone a tuned one at that.
Biasing is for Fault logging of the sensor element and adjoining cables only.

Reading out the ion current isn't rocket science, but it does require a voltage in the region of 300V (I've seen 180V as well). This has been a showstopper for me so far. I've seen some designs which eliminate the 300V power supply by charging a capacitor to 300V with the 30kV (or so) spark and the...

Don't disagree one bit, but we still need to have the safety net of some kind of feedback once the tune is reasonable so we can push it that last little bit and know where the line is drawn. The problem is I have to do the majority of my tuning on the road as I have not found one tuning shop that wi...

I kind of agree with both of you. I realise that there are a finite number of compute cycles available in the CPU so if we want some form of protection we must remove as much of the burden from the CPU and software guys as possible. As an engineer though I want everything to be the best it can be or...

I have used the good old 4051 for several MUX / De-MUX projects nice and simple 3 bit binary, enable pin and 8 to 1 switching. Oh and yes RF becomes more of a feeling and intuition than common sense when you get to microwave territory. I'm wondering if we actually need to have realtime sensing on th...

See told you it was easy! my circuit is more like "Fisher Price my first knock sensor" but it will do the job. I have just realised that the low end crap I was seeing was whine from the alternator, I was using unscreened cables to the sensors doh! but thats good! because that means the act...

OK the BMW part number for my sensor is 12 14 1 738 667 it is Bosch OEM. it's DC resistance is in excess of 1MOhm Bosch website gives these values: sensitivity at 5KHz: 30 mV/G +- 6mV/G Linearity of 5 - KHz Value +- 10 % ( not sure about what this is) Frequency range 3KHz to 22KHz Temp range -40C to...