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Igniter electronic part identify

  • Thread starter Thread starter Matchless
  • Start date Start date
could the -350 marking be for the peak inverse voltage?

I don't believe it is a zener diode.
I believe it's purpose is transient voltage suppression when the ignition coil field collapses.
 
rustybronco said:
could the -350 marking be for the peak inverse voltage?

I don't believe it is a zener diode.
I believe it's purpose is transient voltage suppression when the ignition coil field collapses.
Click to expand...

I am playing with that idea as well, but I am not sure how the Japanese marked their diodes 30 years ago. I think your theory is correct, as exceptionally high back EMF, but very low current is generated when this happens. Normally a standard diode is put across a relay coil for exactly that purpose. A 1N350 has a reverse voltage of 70, so it did not look like the same to me, but...:-k
 
Last edited:
rustybronco said:
I looked at that also, but the only 1n350 i could find illustrated was not a typical diode package. http://www.eca.de/html/1N3/1N350-1.html
what is the breakdown voltage of a ignition capacitor rated at? (?30-40 volts?)
you could measure the primary side P-P voltage of a spare coil with an osilloscope when the field collapses.

http://modecideas.com/faq94.html?newitems
Click to expand...

On the same site I found a 1S350 which is the Japanese format of the time. The case configuration and size seems to be exactly the same with the rounded ends. Now if we can just find the specs on it and an equivalent..?
Unfortunately no oscilloscope available.
 
Matchless, my neighbor has looked at you diagrams and our picture and wants to talk with you. His name is Joe and you can reach him at 503 738 8677 pacific time U.S. or email him at oda@inlet.com He thinks he can help you. Tom
 
Thomas Kenny said:
Matchless, I gave you the wrong email for Joe, the correct email is oda313@iinet.com
Click to expand...

Tom,
Thanks I have just resent to the new address. It is very good of him to help. I have had a lot of feedback, but nothing conclusive. It is definitely a protection circuit for the back emf. Some peple are advocating using a 1N4007, others a IDT04560C Scottky diode, another says it must be a fast 400 V diode, others a 24V Zener and even a higher Zener.
I also cannot find the possible original type 1S350, but there is a site (http://www.eca.de/html/1S3/1S350-1.html) that has the data for such a diode, case type S3 which seems similar, but you need to be subscribed and the mention it as modulator ... something, 30 V and it is a single germanium diode.
I am fairly confident that someone will come up with something soon. Thanks for your trouble.:)
 
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