Jaycar Knock Sensor Re: Injector Duty Cycle

[Rene Van Den Bedem]

I installed the Jaycar Knock Sensor on my car.  The circuit is basically an
amplifier, hi-pass filter, low-pass filter, Schotcky diode to coil, buzzer
& LED level meter.

The knock sensor element is either home-made ( bit of metal with piezo
element out of Ear Piece and coax connected to it) or  commercial unit from
Wrecker.

I found the Kit version to be OK, it worked first go (and so it should
since the electronics are very simple).  However the sensitivity range was
too coarse (trimpot).

However, I disconnected the buzzer straight off.  It drove me crazy while I
was nutting out the sensitivity issue.

Jaycar still produce this kit, Engine Knock Sensor (KC-5203) AUD$34.95 

Jaycar Electronics
Head Office
8-10 Leeds Street, Rhodes, NSW 2138, Australia
PO Box 185, Concorde, NSW 2137, Australia
Telephone: +61 2 9743 5222
Facsimile: +61 2 9743 2066
Mail Order Hotline: +61 2 9743 6144
Mail Order - Order Line: 1800 022 888 (within Australia)
Wholesale Orders: 1800 620 169 (within Australia)
Wholesale Facsimile: +61 2 9743 3070
Delivery Charges:
Mail Post: Max AUD$8.00
Overseas Airmail: AUD$8.00 up to 500g, thereafter AUD$19 first kilo &
AUD$6/kg onwards
Road Freight: AUD$14 anywhere within Australia, up to 20KG
Overnight Jet Airfreight: AUD$10 max 3KG, AUD$16 max 5KG


At 08:44 19-10-98 +1100, you wrote:
>Hi Simon,
>	You mentioned the Knock Display. I purchased a kit from Altronics in
>Sydney. Built it but never got it to work. Have you or anyone built a
>knock sensor and had any success with one.
>Cheers Richard.
>
>Simon Quested wrote:
>> 
>> > -----Original Message-----
>> > From: Simon Quested <questeds at whio.lincoln.ac.nz>
>> > To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
>> > Date: Wednesday, October 14, 1998 11:34 PM Subject: Re: Injector Duty
>> > Cycle
>> >
>> >
>> > Hi All
>> >
>> > I saw a jaycar kit for about US$30 that displays duty cycle while
>> > you drive.
>> >
>> > Jaycar is an aussie kit/electronics supplier.
>> >
>> > My catalog doesn't show one.
>> 
>> Neither does mine. I don't know if it is still being produced but there
>> are 2 kits at south island components. I think jaycar has stopped
>> producing the knock sensor display as well.
>> 
>> > If I sent ya funds would ya send me one?.
>> 
>> No problem !
>> 
>> Cheers
>> 
>> Simon
>> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>   Simon Quested (E-mail questeds at lincoln.ac.nz)
>>   Computer Enginner, Silicon Graphics & Windows NT Support
>>   Computing and Educational Resources
>>   LINCOLN UNIVERSITY OF NEW ZEALAND
>>   Phone (64)(03) 3252811 Ext. 8087
>> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> http://www.lincoln.ac.nz/ccb/techs/simon/default.htm
>> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> Atheism is a nonprophet organisation.
>> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
>
>