Building your own knock sensor headphones

[Bgtym]

where to install a microphone? how to install? simply hang the near the intake manifold
better to plug in a microphone and headphones to a notebook? or amplifier Jaycar KC5152 better suited to this task?

[Matt]

Install microphone in long plastic tube and place near intake of engine.

You could try a notebook. I just made a dedicated unit because its portable and cheap

[Tengis]

Matt, what do you think about connecting two microphones? Putting one near the front of the engine and one near the back.

I FINALLY got all my stuff I ordered from Jaycar (I dont know why it took so long) but Im going to be assembling it soon. There was a minimum order amount so I bought two microphones and some other crap.

[Matt]

I'm not sure... let us know!

[adamky]

I recently made my own set of these using the same headphones that you used. Actually, I had already done this several years ago using one of those personal sound amplifiers, but I had issues with alternator whine/noise feeding into the line and never got around to fixing that. So, this time, I used some shielded "CAT7" Ethernet cable. This stuff is double shielded and really great at minimizing EMI interference: http://www.amazon.com/Tera-Grand-Shield ... detailpage. I used two of the 8 wires to connect right where the harness connects to the little knock sensor sub-harness and then grounded the shielding to the head. I tested it and the alternator whine is gone and I can hear the engine perfectly now. Looking forward to testing them out.

[Matt]

Good stuff. The shielded cable type is important as I had similar issues with engine noise until going to a better quality (higher shielding) cable

[florian77270]

hello, jaycar doesn't delivry to fance , can you give the the spec for that part to find an equivalent in france ,

tank you

[Matt]

There should be something equivalent over there based from the LM386 audio IC

All Australian websites:
https://www.jaycar.com.au/the-champ-0-5 ... t/p/KC5152
https://www.wiltronics.com.au/product/8 ... ifier-kit/
https://www.littlebird.com.au/products/ ... lifier-kit
https://www.altronics.com.au/p/k2115-8- ... ifier-kit/

Some DIY from the same chip
https://www.circuitbasics.com/build-a-g ... the-lm386/
https://www.instructables.com/Tales-Fro ... Amplifier/

For something more permanent you could use veroboard (instead of breadboard). I don't know about PCBs available outside Australia for this project. You just need a simple audio amplifier board (usually available in kit form)

[florian77270]

Hello, i finnaly buy this one for ampli
https://www.amazon.fr/gp/product/B08CXZ ... UTF8&psc=1

this one for microphone
https://www.amazon.fr/TOOGOO-Capsule-Mi ... ts&sr=1-11

+9v bat
+ your headphone

its is ok for you ?

[Matt]

Yes those look good