Automotive Led Timing Strobe

Most older engines, and many newer ones, have timing marks in the form of a line marked on the rim of the vibration damper.
Some engines in front-wheel drive vehicles have timing marks on the flywheel. A pointer is attached to the timing cover.
When the mark is exactly under the pointer, the engine is ready to fire number one cylinder.
The spark will occur with the rotor pointing to the number one cap terminal.
The timing is generally set by using a strobe tamp, which is a light that is operated by high voltage surges from the spark plug wire.
The strobe lamp usually referred to simply as a timing light.

A useful timing strobe can be constructed using 9 high-brightness LEDs and a few common components: 2 monostable (CD4098), 1 double operation amplifier (CA3240E)
and 3 transistors.
Ignition pulses from the number 1 cylinder high-tension lead are used to trigger the circuit via a home-made inductive pickup.

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Author: Primarius D-r Petar Avramovski, writer to magazine Emiter.
The complete article you can read the pages of the Emiter 11/2011


  1. john September 26, 2013 10:19 pm 

    What a great project!

  2. Roberto Baccarat September 28, 2013 6:20 am 

    where i can find this article in english, with drawings, parts list and others, i am not abble to read in russian, the original article is from a russian website where i can not locate the link to those files, thanks in advance, regards

  3. JR January 31, 2014 8:54 pm 

    I would like to buy this circuit. Where can I get the plans and buy the board since it looks made to order?

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