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pt2399 alternative

Discussion in 'Electronic Repair Modifications DIY' started by Viceroy is a cat, Jun 16, 2014.

  1. Viceroy is a cat

    Viceroy is a cat Active Member

    Hello all,

    So I've built a little angel chorus pedal using the pt2399 chip and i get a white noise that is a little too obvious. I took the chip out and the pedal is dead silent. I goggled and it turns out the pt2399 chips have a reputation for this noise. So... My question, is there an alternative quieter chip i can use?


    Viceroy is a cat
  2. Boswell

    Boswell Moderator Distinguished Member

    No, not that I know of. It's a sonic price you pay for a low-cost device like that.

    One of the techniques for dealing with noise from that type of device is to use it in a parallel path only. This means in your case that your pedal would have a direct signal path that does not go through the device and added to it some of the signal that has been through both the delay chip and a low-pass filter. Having the full-bandwidth signal in the output helps to mask the fact that the upper frequencies of the delayed signal have been filtered out.
  3. Viceroy is a cat

    Viceroy is a cat Active Member

    Thanks Boswell! Lesson learned.

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