Blown capacitor identification

Thread Starter

Matt83

Joined May 19, 2019
4
hi I’m looking for a bit of help here
My pond uvc lamp stopped working and upon stripping it to bits the electronic ballast seems to be at fault.
I’ve found what I think is a blown ceramic capacitor which is blue with 334F printed on the side of it. I’m looking to replace this component but I’m having no luck finding a replacement, any help would be great thank you
 

Thread Starter

Matt83

Joined May 19, 2019
4
E8939E1E-9378-4F39-9274-F8B050BB12D4.jpeg This is the chart I was using, I’d guessed it’s also referred to as a 681 but your post has confirmed my thinking as they both seem to be the same component.
If I’m wrong then please tell me
Thanks for your help
 

Daniel Sala

Joined May 28, 2015
60
Hi,

No, that isn't right. Capacitor values such as these are based in picoFarads and written e.g. 10 + 0 = 10pF, 10 + 1 = 100pF, 10 + the number 2 = 1000pF ( = 1nF), and so on.

334 means 33 + four zeroes, e.g. 330,000 pF = 330nF = 0.33uF. 681 is on the other half of the chart, it refers to a 680pF (68 + 0). Notice that the four column titles are repeated.

It's all a bit confusing but you get used to it - to put it this obtuse way, the counting backwards in multiple zeroes ;).
 

Thread Starter

Matt83

Joined May 19, 2019
4
Thanks for helping clear that up for me. I had another look at the chart to understand what you said and I can see my error.
Thanks for all your help
 
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