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DIY Stompboxes => Store => Topic started by: hopkinWFG on August 19, 2017, 10:10:23 AM

Title: Dipped ceramic caps or dipped tantalum caps ... polarized ?
Post by: hopkinWFG on August 19, 2017, 10:10:23 AM
Dear stompbox forumers...

I have an old VHT amplifier which i soldered out these old or rather stock caps which i mistakenly not having to measure their polarity before soldering them out... anyway i then found out these are either dipped ceramic caps or dipped tantalum cap....

I did a quick goggle search and get to know only dipped tantalum caps are polarized and usually have the +voltage marked on the side stating it the positive...

However i examine closely and found one side of the cap 104 esm, and other side marking 137 AHA...
 
How can i know if this is polarized or non polarized cap and the marking that states 104 should be a 0.1uf cap and how can i find its rated voltage ?

Thanks if any kind help be deeply appreciated... :)


(https://s2.postimg.org/c7zjm4b9h/20170819_213450.jpg) (https://postimg.org/image/c7zjm4b9h/)



(https://s2.postimg.org/yp13p6hol/20170819_213435.jpg) (https://postimg.org/image/yp13p6hol/)
Title: Re: Dipped ceramic caps or dipped tantalum caps ... polarized ?
Post by: bluebunny on August 19, 2017, 10:22:04 AM
They're ceramic (and therefore not polarised).  Tants would indeed have the polarity marked and look more like pointy-head aliens, rather than this squished look.  Ceramic caps can take way more voltage than you'll ever find in a pedal (they are slices of stone), so if your intention was to harvest for stompboxes, then you're good to go.  FYI, the "104" code means "10" followed by "4" zeroes - i.e. 100000 - and this is the value in pF.  So shift-right three places to give you 100nF, aka. 0.1uF.

(Aside: you might want to ask a moderator to move your post into the main BYO forum.  This is specifically for posts relating to the DIYSB store.)
Title: Re: Dipped ceramic caps or dipped tantalum caps ... polarized ?
Post by: hopkinWFG on August 19, 2017, 10:45:38 AM
Hi bluebunny,

Thanks for your info... so i can confirm its a dipped ceramic cap thats non polarized, marked 104 as 0.1uf , but i see 137 on other side of the cap and i wonder what does that denotes ?

Sorry for the wrong ad im wrong section...
Title: Re: Dipped ceramic caps or dipped tantalum caps ... polarized ?
Post by: bluebunny on August 19, 2017, 05:37:59 PM
You can.  The 137 - being unrecognisable as a capacitance value - is likely some manufacturer's mark, and for your purposes, irrelevant.
Title: Re: Dipped ceramic caps or dipped tantalum caps ... polarized ?
Post by: hopkinWFG on August 20, 2017, 12:40:45 AM
Thanks alot for the great help :)