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DIY RC Filter replacement

Discussion in 'Datasheets, Manuals and Component Identification' started by ssjenkins, Feb 20, 2020.

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  1. ssjenkins

    ssjenkins

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    Feb 20, 2020
    Hi All !

    I want to replace these RC units from an old fruit machine . 0.1uF + 47 ohm 250V . The problem is that I have 25 of them to change , and looking at RS , that's going to cost me about £80 which I'm not willing to pay . Could I just hook up a cap and resistor in series for each one ? I know it won't look so pretty , but I can't justify the cost for the repair . Any suggestions ?

    Sammy
     

    Attached Files:

  2. Hunter64

    Hunter64

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    Nov 20, 2018
    Just replace them, or wait for the fireworks!

    These capacitors are guaranteed to fail.
     
    Last edited: Feb 20, 2020
  3. Tha fios agaibh

    Tha fios agaibh

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    Aug 11, 2014
    I don't see why not.
    Just use axial caps and solder the resistor on one end, then cover with heat shrink tube.

    They likely need replacement due to age but how did you test them?

    Edit: I just saw 2nd picture. Strike "likely"
     
    Last edited: Feb 20, 2020
    Martaine2005 likes this.
  4. Harald Kapp

    Harald Kapp Moderator Moderator

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    Martaine2005 likes this.
  5. bertus

    bertus Moderator

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    Nov 8, 2019
    Martaine2005 likes this.
  6. Tha fios agaibh

    Tha fios agaibh

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    Aug 11, 2014
    Good point about the safety caps.
    Even if X2 caps are used, it roughly 1/3 the cost of replacing with an oem snubber.
     
  7. ssjenkins

    ssjenkins

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    Feb 20, 2020
    Many , many thanks for all the replies . The ones that are in it are X rated , but I'll have a look for X2 rated ones on the RS website .

    Sammy
     
  8. Martaine2005

    Martaine2005

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    May 12, 2015
    More than likely as fruit machines are more commercial than industrial 3 phase. X1s can be used but cost more.

    Martin
     
  9. ssjenkins

    ssjenkins

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    Feb 20, 2020
  10. Martaine2005

    Martaine2005

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    Absolutely fine.
    Still cheaper to seies two components as @Tha fios agaibh suggested.

    Martin
     
  11. ssjenkins

    ssjenkins

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    Feb 20, 2020
    Thanks martin . Could someone give me a link or 2 to some suitable components and I'll have a look .
     
  12. Martaine2005

    Martaine2005

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    X2 caps are readily available on all sites or shops. As are the resistors.
    Your post code (zip) will indicate your local electroniics store.

    Martin
     
  13. ssjenkins

    ssjenkins

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    Feb 20, 2020
    Last edited: Feb 20, 2020
  14. Tha fios agaibh

    Tha fios agaibh

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    Aug 11, 2014
    You wouldn't be able to solder it in.
    I'd use an axial type cap and solder one lead in one hole, and the resistor in the other. Then solder the leads at the top.
    Screenshot_2020-02-21-04-41-04-1-1.png
     
  15. ssjenkins

    ssjenkins

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    Feb 20, 2020
    Many thanks for that Tha fios agaibh . The only issue is that they look to be more expensive than the original RC oem part . I'll see if I can dig some up .

    Sammy
     
  16. ssjenkins

    ssjenkins

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    Feb 20, 2020
    Hi Guys .

    I can get 100 X new 0.033uF axial 250V X2 caps for a decent price . Mine are 0.1uF though . Will it make much difference , or will I be able to get away with it ?

    Thanks in advance

    Sammy
     
  17. bertus

    bertus Moderator

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    Nov 8, 2019
    Hello,

    The circuit will be likely less effective with the 0.033 uF in stead of the 0.1 uF.
    They will have a reason why they use the 0.1 uF.

    Bertus
     
  18. ssjenkins

    ssjenkins

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    Feb 20, 2020
    Hi Bertus !

    Thanks for the reply . OK . I'll keep searching then :)

    Thanks
     
  19. bertus

    bertus Moderator

    548
    179
    Nov 8, 2019
    Hello,

    The RC combination is likely to be a snubber circuit.
    The wiki has some info about the snubber circuits:
    https://en.wikipedia.org/wiki/Snubber

    I have also attached a PDF with some theory on snubber circuits.

    bertus
     

    Attached Files:

    Last edited: Feb 22, 2020
  20. ssjenkins

    ssjenkins

    9
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    Feb 20, 2020
    Just for information . I ended up buying 25 from this guy .

    https://www.ebay.co.uk/itm/331867710395

    I made him an offer , so I got them a bit cheaper .

    Thanks again to everyone for their help .
     
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