do anyone know what is this - solid state fuse?

Frequently asked questions on capacitor types, ratings, brands, use and abuse.
Post Reply
User avatar
kwm488
Information
Posts: 18
Joined: 16 May 2012, 16:39

Post by kwm488 »

hi
do anyone know what is this?
where can i buy this?
i believe this is not capacitor.

Image

User avatar
kwm488
Information
Posts: 18
Joined: 16 May 2012, 16:39

Post by kwm488 »

sorry
the photo not work
please see here

https://i23.photobucket.com/albums/b383 ... 640fe1.jpg
Attachments
20130417_033723.jpg

User avatar
kwm488
Information
Posts: 18
Joined: 16 May 2012, 16:39

Post by kwm488 »

i know i post a wrong place. but i can't del this post

User avatar
square wave
Breadboard Brother
Information
Posts: 61
Joined: 13 Apr 2013, 18:16
Location: USA
Has thanked: 19 times
Been thanked: 24 times

Post by square wave »

Looks like a ceramic multilayer cap to me. Just a regular old capacitor.

As for the code stamp... googling "capacitor LF30" found this page. Looks like that's a lead formation indicator. And I figure "090U" is the capacitance value but I'm not sure what it means. Maybe 90nF?

User avatar
coldcraft
Diode Debunker
Information
Posts: 725
Joined: 11 Jul 2009, 01:00
Has thanked: 38 times
Been thanked: 85 times

Post by coldcraft »

if that's in a JHS morning glory, then that part is actually a solid state fuse of sorts.
Black Dynamite wrote:you need to shut the fuck up when grown folks is talkin.

User avatar
kwm488
Information
Posts: 18
Joined: 16 May 2012, 16:39

Post by kwm488 »

hi
yes. it is jhs morning glory. why you know it?
i think it is fuse 。do you know where can i buy it

User avatar
square wave
Breadboard Brother
Information
Posts: 61
Joined: 13 Apr 2013, 18:16
Location: USA
Has thanked: 19 times
Been thanked: 24 times

Post by square wave »

I stand corrected. I've never seen these types of fuses. Learn something new every day!

Sorry, I don't know where these can be purchased.

User avatar
toneman
Resistor Ronker
Information
Posts: 343
Joined: 17 Jul 2007, 13:05
my favorite amplifier: anything that works
Completed builds: meatolation, wobolation, ringolation clones, PAiA synths/modulars, dipthonizer clone, MOTM modules, pedal mods and repairs
Location: sacatomatoes, Kali4neeaa
Has thanked: 183 times
Been thanked: 45 times

Post by toneman »

looks like a ceramic cap at first glance..

What does it say on the board right next to the part??

I see a "....1.."......

T
Tone-to-the-Bone

User avatar
kwm488
Information
Posts: 18
Joined: 16 May 2012, 16:39

Post by kwm488 »

hi
i find more information. it is proved.

it is brand of Littelfuse, model no is 30R090U. it is mean 30v , 0.9A.

and it install in the board of F1 location.

User avatar
Lucifer
Cap Cooler
Information
Posts: 671
Joined: 06 Apr 2011, 12:59
my favorite amplifier: Vyse BBQ Blue
Location: Dorset, UK
Has thanked: 89 times
Been thanked: 72 times

Post by Lucifer »

I think this type of device is called a Polyfuse or Polyswitch - 'poly' because it can be used over and over - ie, it resets itself, so you don't have to replace them like glass fuses.

I'm not sure how they do this - I think it's to do with a physical/chemical breakdown under stress (ie, too much current).

Some amp and computer manufacturers use them to protect the mains transformers.

Search for 'Polyfuse' or 'Polyswitch' for more info.
”Sex is great - but you can’t beat the real thing !” - The Wanker’s Handbook

User avatar
deltafred
Opamp Operator
Information
Posts: 1654
Joined: 06 Apr 2010, 16:16
Location: England
Has thanked: 813 times
Been thanked: 306 times

Post by deltafred »

kwm488 wrote:hi
yes. it is jhs morning glory. why you know it?
i think it is fuse 。do you know where can i buy it
It would have helped if you had given us all the information that you had on it first, things like

Pedal make and type.
What the silk screen component identifier marking for it is (a fuse it is probably marked something like F1).
Position in circuit (being a fuse it is probably right after the power input ).
What it read with a multimeter.
Politics is the art of so plucking the goose as to obtain the most feathers with the least squawking. - R.G. 2011
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012

Post Reply