electrical/power tool help

Fantom

Fantom

Fantom

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Hi guys, I wasnt sure which area to post this in but I was sure that some OCUK's would be able to help me/point me in the right direction.

Basically I was using my trusty jigsaw the other day and it blew up on me quite spectacularly, anyway I took it apart to try and find the cause (expecting lack of carbon brushes) and found this little capacitor type object:

IMG_2407.jpg


I wonder if anyone could tell me what it is? and where I can get a new one? and possibly what may have caused it to self destruct?

Many Thanks
James
 
It looks like it is possibly some kind of RF suppression capacitor, going by the way it appears to be connected.
 
ok, by that logic then, if I just bypass it then the tool should still work but may interfere with radios etc? do you think that a "general" RF suppression cap would work? as im having difficulty sourcing one with exactly the same markings etc.
 
bit of research tells me that yes it should just work and interfere with close radios etc, might try that and if it does work get an RF suppression cap.
 
That's a 1uF film capacitor rated at 250v with 2x 2400pF high
voltage capacitors in a Y configaration.

There's a few here

http://www.digisellers.nl/acatalog/aanloopcondensator.html#aW9_2d11225

Not sure if one of them suits but they are pretty pricey.

High voltage film caps are more expensive but not sure if it's quite that much more.

As far as I know this will be a 1uf film cap in series with 2x 2400 pF in parallel with each other.

Code: 
--------------------------------------------
                                        |
                                        |
                                        =   1uF
                                        |
                                        ----
                                        |   |
                                        |   |
                                        =  =  2400pF
                                        |   |
                                        |   |
-----------------------------------------------

The X capacitor does a job and so does the Y capacitor so both are important.

More about line filters here.
 
I have found the one on that website but I guess I cannot order from the UK, and idea where I could get one in the uk?
 
Curious, I've never seen a suppression circuit using capacitors in a serial Y arrangement before, I'm not sure I follow the thinking behind that.
Unless this is just a way to frig a circuit with low rated capacitors? Weird...

I also don't get why this would be expensive, a snubber circuit is just as good and is probably a quids worth of kit?
 
Last edited:
Tealc said:
That's a 1uF film capacitor rated at 250v with 2x 2400pF high
voltage capacitors in a Y configaration.

Code: 
--------------------------------------------
                                        |
                                        |
                                        =   1uF
                                        |
                                        ----
                                        |   |
                                        |   |
                                        =  =  2400pF
                                        |   |
                                        |   |
-----------------------------------------------

.
Click to expand...

Ah, that's wrong, that's why it looked odd...

The pf caps are in series, but are in parallel with the 1uf, there is no middle connection.
 
Last edited:
bitslice said:
Ah, that's wrong, that's why it looked odd...

The pf caps are in series, but are in parallel with the 1uf, there is no middle connection.
Click to expand...

Oops yes it is wrong.

Anyway I found one in the holiday camp store with the same 0.1uF but with different picofarad caps, I think they were 4700pF. This one has the third wire though so is probably quite different.

Then there's this one eBay. http://www.ebay.co.uk/itm/SUPPRESSI...?pt=UK_Sound_Vision_Other&hash=item4cfb6c1a50

I wonder if the third wire has blown off. Every one I see seems to have the third wire.
 
Last edited:
The 6 Amp is probably just the capability of the cable. Capacitors are voltage devices and generally if they are 250v will handle high current.

What about a 0.1uF 250v film capacitor, 2 x 2400pF and wire them up yourself?

0.1uF 275V Polyprop film cap.
http://uk.rs-online.com/web/p/polyester-film-capacitors/0148474/

2200pF/2,2nF 400V film cap.
http://uk.rs-online.com/web/p/polyester-film-capacitors/0378833/

There's also caps available singly here..

http://www.bitsbox.co.uk/capacitors/hvceramic.html

http://www.bitsbox.co.uk/capacitors/x2caps.html

.and you can avoid RS rip-off prices and £6 postage charges.

2400pF/2.4nF/0.0024uF are not standard capacitance rating so will be trickier to find. However capacitors are generally very loose with tolerance so 2200 will be close enough to 2400 to make little difference.

and then grab a few wires capable of carrying 6 Amps, something like 0.75mm 3 core mains cable H05VV-F 3183Y, or re-use the ones that blew up.

...or is that a silly idea?


Wired thus, I think.

Code: 
--------------------------------------------
                        |                  |
                        |                  = 2200pF/2.2nF
                        |                  |
                        =    0.1uF         |----------
                        |                  = 2200pF/2.2nF
                        |                  | 
                        |                  |
----------------------------------------------
 
Last edited:
Hi Tealc,

I bypassed it tonight and the jigsaw worked, i put it up near to the radio and no interference whatsoever! the Germans must make decent motors!

Can you see any major issues with this? its only for home/diy applications so not going to interfere with much I guess...

Thanks again for your help.
 
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