Hi everyone. Apologies for posting yet another in what I see is a nu Ber of similar questions but I am stumped and I can't find the answer in the tables referenced.
I am repairing an old automotive timing gun/stroboscope. This contains a fairly meaty capacitor about 2x1x0.3 cms in size. Its helpfully marked 2 microfarad but I measure it now as barely 0.5. Its only other markings are the single letter "M" on its own and the number 3Y03. I'm guessing this somehow relates to V but can't find a key with either a Y or an M in it.
All help appreciated
Many thanks
Mike

 

Hi everyone. Apologies for posting yet another in what I see is a nu Ber of similar questions but I am stumped and I can't find the answer in the tables referenced.
I am repairing an old automotive timing gun/stroboscope. This contains a fairly meaty capacitor about 2x1x0.3 cms in size. Its helpfully marked 2 microfarad but I measure it now as barely 0.5. Its only other markings are the single letter "M" on its own and the number 3Y03. I'm guessing this somehow relates to V but can't find a key with either a Y or an M in it.
All help appreciated
Many thanks
Mike

Browse through some catalogs until you see similar capacitors.

 

HI,
Can you give a shot pictures. If it was very small it will not 2uf but nano farad.
other m3yo3 ,My guess is Month 3 year 2003. usually a small capacitor is used for bypass high frequency
or any feeback signal to a circuit.

 

Thanks guys./gals. I have found similar looking capacitors but O suspect this one is going to discharge through the tube and do might need to be a high voltage? The strobe dates from the 70s and I doubt any components have been changed since. It all looks neat and tidy in there. Trying to upliad picture but in case it doesnt work its just a yellow of dimensions as above

 

Sorry.. why does auto correct never correct the errors but change real words!
I meant yellow box and upload!

 

Contacted Rubycon but they have no info either? Any ideas?
Cheers
Mike

 

Hello,

It is a 2.0 μF capacitor with a tollerance of ± 20 %.
http://www.marvac.com/fun/pmylar_codes.aspx

The voltage may be written on the back side.

Bertus

 

Hi everyone. Apologies for posting yet another in what I see is a nu Ber of similar questions but I am stumped and I can't find the answer in the tables referenced.
I am repairing an old automotive timing gun/stroboscope. This contains a fairly meaty capacitor about 2x1x0.3 cms in size. Its helpfully marked 2 microfarad but I measure it now as barely 0.5. Its only other markings are the single letter "M" on its own and the number 3Y03. I'm guessing this somehow relates to V but can't find a key with either a Y or an M in it.
All help appreciated
Many thanks
Mike

About 2uF 400V is fairly typical - ITT used to make pulse capacitors suitable for this purpose, they're the oblong buff coloured ones, the type class may have been MKT - but there are so many type classes and my memory is not as good as it was.

Gradual loss of capacitance isn't a huge surprise in a capacitor discharge system.