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Member postings for Henri van der Riet

Here is a list of all the postings Henri van der Riet has made in our forums. Click on a thread name to jump to the thread.

Thread: Ignition coils for small engines
25/06/2009 17:26:02
Hi guys
I am planning to add two "features" to my Tim-6 circuit:

1. An electronically adjustable dwell angle.
2. A safety feature that will protect the coil from possible burnout in the rare event that the engine stops with the magnet over the Hall sensor. In this situation the coil will be charged with a continuous 6V – surely it wil be bad for the coil.

I’m thinking of using a HEF4538B IC “dual retrigger rable -resettable monostable multivibrator” – don’t ask about the name

It would be able to have an output high for a specified time after the Hall sensor fires, with even a single small magnet, which would give the dwell angle effect. The dwell time/angle can be changed/tuned on the fly with a potentiometer and capacitor combination.

I think it would also be able to have a maximum time that the output will stay high to effectively shut off the coil when the magnet gets “stuck” in front of the Hall sensor.
Hey, I just thought of another idea - it can be used to have a adjustable timing if it is used to set a variable time to "wait" after the sensor has fired.

I will post the schematic as soon as it works,– If I can just get some more time to spend on the hobby!!

Thanks Dave for the links above – the warning about testing the coil with a too large gap is very true – luckily my Hall sensor has very good ESD protection and only needed to be powered down to reset it after the spark leaked through and zapped the whole system.

Cheers - Henri
Thread: Jan Ridders Pressure-controlled Two-stroke engine
09/06/2009 11:45:12
 
Can i reccoment that you guys, building Jan's desing, use both plans - the one from the MEW magazine and the ones that Jan can mail you on request from his website.
I found that the detail from both combined makes life much easier. But note that some dimentions ware different between the two- as Jan is entitled to change, because he's the master .
 
I've laminated his mailed designs pages back to back for use in the workshop and use the MEW ones as a supplement.
 
PS: Using a Hall sensor and magnet with a CDI or Transistor Ignition, will completely elliminate the extra frictions and spring forces of the mechanical breakers or peizo ignition options.
 
Cheers
Thread: Ignition coils for small engines
03/06/2009 15:21:52
Hi John
 
I am also busy building the IC engine by Jan Ridders - my first engine, i've completed all the brass components so far.
 
I have already built the ingition system based on the TIM-6 from http://www.5bears.com/tim4.htm and http://www.jerry-howell.com/IgnitionModules.html.  My system uses all the components mentioned on the sites plus the following:

- Second hand 6V ignition coil from a Yamaha motorcycle  (C2T4) - Nice and small.
- NGK CM-6 plug.  Also has a 10mmx1mm thread.
- 6V 4.2Ah Sealed Lead Acid battery
- 3mmx2mm rare earth magnet.
 
I've tested it up to 5000 rpm using a DC motor in the place of the engine.
I will keep you up to date if it works on the engine.
 
Henri
 
 
 
 
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