A little project I have been building recently to assist with engine tuning is a Detonation Detector.
I didn't design it but I have modified the original slightly.
The original article is located here: -
http://www.autospeed.com/cms/article.html?&A=1353
I decided to use 1/4" plugs and jacks for the MICrophone and headPHONES connections and an LED illuminated push button switch for the power.
Attachment:
![[ attachment ]](./download/file.php?id=31339&t=1&sid=2a40cfb5e2a6f83cc9983a48bdbba94b)
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The basis is a 0.5W amplifier which is about the same size as a 9V transistor battery.
Attachment:
![[ attachment ]](./download/file.php?id=31340&t=1&sid=2a40cfb5e2a6f83cc9983a48bdbba94b)
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Here is the entire device inside a utility box.
Attachment:
![[ attachment ]](./download/file.php?id=31341&t=1&sid=2a40cfb5e2a6f83cc9983a48bdbba94b)
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One end is for the ON/OFF switch and the MIC input.
Attachment:
![[ attachment ]](./download/file.php?id=31342&t=1&sid=2a40cfb5e2a6f83cc9983a48bdbba94b)
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The other end has the VOLume control and the headPHONES jack.
Attachment:
![[ attachment ]](./download/file.php?id=31343&t=1&sid=2a40cfb5e2a6f83cc9983a48bdbba94b)
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Here is the box with MIC and PHONES plugged in: the MIC has a 2M cable on it which has standard stereo wiring.
A standard Tip Ring Sleeve Stereo extension cable can be used if necessary.
Attachment:
![[ attachment ]](./download/file.php?id=31344&t=1&sid=2a40cfb5e2a6f83cc9983a48bdbba94b)
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My creative name for the 'box
It is very sensitive with the piezo transducer bonded to a simple battery clip.
It will be interesting to listen to the little G15 in my Fairlady and see if I can pick up any detonation happening.
Plus you can clip it to any part of the engine/body/chassis to trace mysterious noises
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