Link to the kind of "POT" i would need for this? That sounds like an incredibly good idea that I'm going to have to jack when building mine.

 

I will have to watch the video and see what resistor the guy called for. Just go to radioshack and find a potentiometer (AKA "POT") that will work for that range. I might not put it back in the original case...I may just put it in some kind of radio shack project enclosure. Who knows.

 

Thought the guy said 33 ohm.

 

You are correct

 

Got my stethoscope in, will now be looking for a sheilded audio cable and some resistors or a "POT" as discussed above.

This stethoscope tool is pretty neat on its own though, gotta love HF.

 

Same here I should be getting mine anytime now. I guess local RadioShack will have everything

 

Mine was lost by my apartment complex. Hope to figure that out soon and get started...

 

And let me guess: your dog ate your project file?

 

POT [the non smoking variety] = potentiometer [preferably also non smoking]

 

I've got mine, but with no local radio shack to get parts from I'll have to order the other crap online.

Sad face.

 

Got mine in... awesomeness to follow

 

anyone gotten further with this?

 

Been busy on other stuff. I probably am going to use a resistor instead of a variable pot because I am cheap.

 

OK, I guess somebody's gotta be first. Just finished mine a few minutes ago.
Popped the case, it looks like this:


Removed the screws.


Here's the front.


And the back.


A close up of the resistor.



After pics. I used a shielded cable made for playstation, more internal stuff than I needed, but it was laying around. In this case each wire got it's own shielding and the outer shielding was tied into the negative terminal on the battery. I found there was a like a 60hz hum that was there until I added the resistor. I went out and bought a 33 ohm resistor and compared it to some other resistors I had laying around. On the bench, I like the sound best of a 33K ohm instead. It may be different on the car, but there are two audio controls. One on the unit and one in line on the headphones. (sorry, hot glue got a little messy)



This is the Bosch sensor I used. It's on Volvo and Saab turbo's. You can also use the cable that came with it. I would bet it's shielded.

The bolt on the block was larger than the hole in the sensor, so I welded a stud to the bolt so it would work.

I'll start it tomorrow and see how it sounds.
Cheers,
-JB

 

very interesting

 

MADD props, and thanks for the writeup. Keep us updated on the results.

 

Subbed....bought mine, sitting in the bag from HF still.....hope to tune in less than two weeks so I have to figure something out!

 

I'll finish mine eventually...

Nice work

 

This thread needs more love before I'm convinced to build one

 

Any positive/negative results from this?