Two caps instead of 1 ?

[ukvince]

I'm having trouble finding a capacitor of the correct voltage for a panel repair. The original is an MKP 400vac 2uf. I can however get 250vac 2uf caps. Is it possible to join two of these together to give me 500vac but still retain the 2uf capacitance ? If so how would you suggest i do it? series or parallel....
Thanks

[Radio Fox]

Re: Two caps instead of 1 ?

The only way to get the required voltage is to connect them in series, but if you do that, then the capacitance will be halved. So you will need 4.7uF capacitors.

Connecting them in parallel wont work, as the voltage will remain at 250v, and the capacitance will be doubled.

[ukvince]

Re: Two caps instead of 1 ?

thanks for your reply....just the info i needed.
I'll get them ordered today

[brethin]

Re: Two caps instead of 1 ?

Still may not work, you need to check the ESR as well.

[japlytic]

Re: Two caps instead of 1 ?

Do you have a picture of where the capacitor goes?

[ukvince]

Re: Two caps instead of 1 ?

This is the original cap removed from the board. It's only showing a capacitance of .5uf on the meter. I managed to find the exact one on uk-mouser but with a minimum buy of 265 units !!
Rant Time .... this is the 21st century and an otherwise perfectly good fridge freezer will be scrapped because of a £2 part that is unavailable to buy as a single piece.

Someone somewhere must have one of these, or an equivalent, but i'm ****** if i can find one.

[b700029]

Re: Two caps instead of 1 ?

http://search.digikey.com/scripts/Dk...me=495-2988-ND

[ukvince]

Re: Two caps instead of 1 ?

Thanks for the link but the minimum order on that is 800 pieces !!

[Radio Fox]

Re: Two caps instead of 1 ?

Thanks for the link but the minimum order on that is 800 pieces !!

The price break is 800 pieces, not the minimum order.

It's out of stock anyway.

[PCBONEZ]

Re: Two caps instead of 1 ?

http://www.mouser.com/ProductDetail/...bJu7n05zdRU%3d

http://www.mouser.com/ProductDetail/...c6cNw7ZgE0s%3d

[ukvince]

Re: Two caps instead of 1 ?

if you try to order one it says minimum quantity not met ... see price break...

[ukvince]

Re: Two caps instead of 1 ?

the ones at mouser are electrolytic and dc. I need 875vdc/400vac. I have found a good match B32674D8225K but nobody has stock.....just have to wait i guess or tell them to buy a new freezer...

[PCBONEZ]

Re: Two caps instead of 1 ?

if you try to order one it says minimum quantity not met ... see price break...

That's because they are out of stock.

[jetadm123]

Re: Two caps instead of 1 ?

Any chance you work/live near a appliance repair center? Maybe they have replacement caps or salvaged boards they pull parts off of. Not the most ideal solution, but maybe worth a try?

[mockingbird]

Re: Two caps instead of 1 ?

Newark/Farnell has "film" capacitors with those values in stock.

[PCBONEZ]

Re: Two caps instead of 1 ?

Original is a film cap.
https://cdn.badcaps-static.com/pdfs/...3a46754070.pdf

[PCBONEZ]

Re: Two caps instead of 1 ?

Also note: The manufacturer's data sheet doesn't mention 875 volts anywhere.
.

[PCBONEZ]

Re: Two caps instead of 1 ?

Try these.
http://www.mouser.com/Passive-Compon...acitor&FS=True

[ukvince]

Re: Two caps instead of 1 ?

Well ... you'll all be pleased to know that the freezer is working again...

the two pics are before and after. I replaced the small triac too as it was sometimes giving dodgy readings.
Fitted it today and the freezer fired up like a good un...

Price for appliance man to come out and fit new module = £200
Actual cost for parts and repair = £4.98

[PCBONEZ]

Re: Two caps instead of 1 ?

Congrats!
.