Recent content by a70duster

I did build the circuit back in June and it appears to work. Here is frequency response of the output of the circuit. Engine speed varied from 2500 PRM to 6000 RPM. Here is a snapshot at 2500 RPM Here is a snapshot at 6000 RPM So the notch filter is doing its job. There is some DC and...

I also was wondering why there is no other "harmonics" of 5.9 kHz. The way I understand it that the knock sensor is a piezoelectric element. Now I am wondering if 5.9 kHz is its natural frequency. Back to the lab!

The need for an analog filter is a quick response to knock by backing the timing off before the next ignition event. Some more information. Low RPM no knock Max RPM no knock Light knock Heavy knock So if I am looking for engine knock at low RPMs, it should be pretty easy to find it at...

benta - Thanks for the input. The filter design and component choice is from the Texas Instrument program called FilterPro. After poking at it some more - I am finding more features within the program. It shows deviations from Q and fn when component tolerance is 1% of listed values. Playing...

Crazy! Not piston diameter but bore size. The size of the cylinder has a part in the frequency of the knock. If you don't believe me then search the internet.

I was hoping to get away with asking a basic filter question - but that isn't going to happen. ;) Here is more info. I based the design of the filter on this equation. Knock Frequency (in kHz) = 1800 / (pi * d) where d = piston diameter The test engine is a 4 cylinder and has 100 mm pistons...

Thanks for the feedbak - let me give some more info on this. The bandpass of the filter is 5.0 kHz to 6.4 kHz. I am looking at a knock signal of an engine. I am using the filter to only look at the knock signal and filter out all the other noise not in the bandpass region. I am looking at...

Easier said than done...

So this is my first stab at designing and building a bandpass filter. TI has a filter building tool that determines component values. I am creating a 4-pole Chebyshev band-pass filter with a uni-polar power supply (5 volts) and a LM324 as the op amp. How spot on do I have to be with component...

I did google it and there was plenty to choose from. I was looking for recommendations on a specific one from an end user and I should have stated that in my original post.

Hi there, At my work, I have been given the task to find a 3? power meter that has an ethernet port and can communicate via TCP/IP. This device will be permanently mounted and remote communication will be used to view the meter. The meter will be monitoring the power supply to a ski resort...

Or export the tag list from the PV which should be a *.csv file. Then import them into the Red Lion display.

Thanks hydtools

^^^ I did some searching and that is where I found "rigged to advantage/disadvantage" but it doesn't go through tension increase from pulley friction.

We are riggers (well the mechanical types are). I work at a ski resort and we are improving our knowledge. Our biggest rig is resplicing the haul ropes and that is a horizontal load.