Please review design and error of electronic ignition

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i doubt on diode and i will remove the diode tomm morning, i doubt tht diode gives direct access of GND to output.
 
I think Diode is giving Negative charge to output as( Anode to Cathode direction). I did not yet remove diode.
Please suggest:


I tried removing the diode but result still the same. What is the problem?
 
Last edited:

Ok i have mounted the parts on breadboard now..and it works as you told. it gives output without magnet and tuned off when magnet is at front of hall sensor. now question is..why its not working with my pcb? perhaps any part is mounted before or after somewhere? please check my first post with a pcb design and schematic.
Also i want my circuit should not give any output but only when magnet at front of sensor. currently it is doing totally reverse manners.
 
easy.rahil said:
Also i want my circuit should not give any output but only when magnet at front of sensor. currently it is doing totally reverse manners.
Click to expand...
What do you mean by "output"?
It is behaving as expected. The coil should be energised when the magnet is absent. The magnet presence should cause the coil to de-energise. A spark will be generated when the coil switches OFF.
 
this is how ignition works pic below.
If mosfet gives or connect the ground it will give spark at BDC and spark should be at TDC only.
 

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That is a standard Kettering ignition circuit which gives a spark when the points OPEN, allowing the stored coil energy to generate a high voltage. When the points connect the coil to ground (dwell time), current builds up in the coil and the coil stores energy.
 
right, thtats how i want this circuit to work.
 
original reply to someone in the christopher's thread( actual designer of this schematic):

what does that means? am i using wrong sensor? what is difference between latch and hall sensor.
 
hello MOd, can you please make t his thread to some other (gerneral electronics) thread please? i m not getting any sufficient help here.
 
Lyndon Mark said:
helpful source
Click to expand...
using permanent magnet is difficult to use on board. i wanted to use a simple 3144 hall sensor to work with this circuit. if anyhow anyone can modify this design would be helpful. as **broken link removed** ignition do. i just used melexis geaartooth sensor by mistake. actual hall sensor was A1250 hal latch. but i did not find in here. if any other hall sensor i can use.
 
The A1250 may not be what you want for this application, as it's a latching type which requires an alternating-polarity magnetic field to operate.
Here's a datasheet extract:
"The A1250 Hall-effect bipolar switch turns on in a south polarity magnetic field of sufficient strength and switches off in a north polarity magnetic field of sufficient strength."
 
yes right, i need a simple hall sensor to work with south pole only , which turns on with south pole and turned off w hen field unavailable without need of north pole.
 
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