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(Topic ID: 276307)

Resistor values on DE power supply


By arolden

61 days ago



Topic Stats

  • 6 posts
  • 4 Pinsiders participating
  • Latest reply 54 days ago by G-P-E
  • No one calls this topic a favorite

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    #1 61 days ago

    Hi all.

    I am rebuilding a DE power supply which was damaged by severe corrosion from a leaking capacitor at C2. The schematics have really strange values listed for each of the resistors which are not standard resistor values. For example, R1 is 2.74K, R2 is 2.15K, and R3 is 4.99K. Standard resistor values closest to these are 2.7K, 2.2K and 5.1K, respectively. Do I need to match the values on the schematic, or can I substitute with the closest standard value? Most of these resistors have a tight tolerance of 1% so the standard values will be slightly out of range if substituted.

    Thanks for any advice.

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    #2 61 days ago

    Schematic calls for 1% tolerance so stay with the 1%.

    #3 61 days ago

    Those low tolerance resistors select the voltage output from the voltage regulator.

    #4 61 days ago

    Absolutely, those must be 1% resistors.
    Go with metal film resistors to get those values.
    Use the same value of resistor at R4 as R7. R4 doesn't need to be 1% but no need to buy two different types between these two.

    You also need to do a bit more cleaning near C2.

    1 week later
    #5 54 days ago

    Thanks for the advice, everyone. All fixed and working now. I was actually able to get 0.1% resistors more easily than the 1% so I went with those. Voltages appeared good so I assume this is OK—are there any potential problems with going to 0.1%?

    Quoted from G-P-E:

    Absolutely, those must be 1% resistors.
    Go with metal film resistors to get those values.
    Use the same value of resistor at R4 as R7. R4 doesn't need to be 1% but no need to buy two different types between these two.
    You also need to do a bit more cleaning near C2.

    Ed, you're right that there needed to be more cleaning. That photo was taken before I actually started cleaning it. This one was taken during reassembly.
    20200906_005107900_iOS (resized).jpg

    #6 54 days ago

    No problem going to 0.1%

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