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Comments for Capacitor Identification

Current Discussion: Main discussion

  1.   #1
    rayma's Avatar
    diyAudio Member
    It's doubtful that a 22pF capacitor is part of the RIAA network, but COG ceramic capacitors are good enough for audio.
    Do you have a link to the schematic?
     
  2.   #2
    oltern8's Avatar
    diyAudio Member
    Hi

    Thanks for the reply. Here's the relevant page of the schematic. It's not on the web as far as i know. If you want i can send you the complete schematic it's too big to upload here in its entirety.

    I was under the impression that ceramics were a big no no especially in place that have such a bearing on the overall sound of a circuit.

    I thinks I might have solved my initial issue with the brightness by installing a NE5532 in place of the op amp responsible for the riaa amplification. I know its not really a suitable alternative as far as the data sheet info says but sounds a hell of a lot better.

    thanks for you help

    oli
    [image]SDOC2537 (dragged).pdf|thumb[/image]
     
  3.   #3
    rayma's Avatar
    diyAudio Member
    [QUOTE=oltern8;4041480]

    I thinks I might have solved my initial issue with the brightness by installing a NE5532 in place of the op amp responsible for the riaa amplification. I know its not really a suitable alternative as far as the data sheet info says but sounds a hell of a lot better.

    thanks for you help

    oli[/QUOTE]

    That's not an RIAA stage, just a 1.5 times gain stage. The 22pF/33Ohm feedback parts are a stability compensation network.
     
  4.   #4
    oltern8's Avatar
    diyAudio Member
    thanks I have found the riaa network on the schematic and it makes more sense although i haven't seen one like this before. the cartridge is loaded at 56k so that probably is contributing to the bright sound.

    thanks for your help.

    oli
     
  5.   #5
    rayma's Avatar
    diyAudio Member
    [QUOTE=oltern8;4042133]thanks I have found the riaa network on the schematic and it makes more sense although i haven't seen one like this before. the cartridge is loaded at 56k so that probably is contributing to the bright sound.[/QUOTE]

    You might also need some shunt capacitance, check the cartridge specs.
     
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