Electronics > Projects, Designs, and Technical Stuff
PT2399 is bad
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Mechatrommer:
sounds good to me even though you went nuts at the end. whats not good is your video focus. why your video cam is not good?
its an echo processor, not delay processor...
http://www.princeton.com.tw/Portals/0/Product/PT2399_1.pdf
SiliconWizard:
Yeah the video is fuzzy and the problem is not clear. Is it correct to understand that you buffered the input signal through an external opamp and YET notice perturbation at the input of your opamp? Or is it at the input of the PT2399 and thus at the output of your opamp? The PT2399 would have to be pretty fucked up if this is the latter (loading an opamp's output enough to cause that!)

Have you taken a look at the power supplies? They may be the culprit?
Jan Audio:
The scope is at the opamp input that is not in the PT2399, from there it goes to the PT2399 opamp together with the feedback.

For the power supply i added a 47uF + 100nF at the PT2399.
Jan Audio:
Here is a better video :

https://youtu.be/PxMkfbVhBEg
Buriedcode:
Maybe I'm missing the point but it *sounds* fine to me.  Your source has, what sounds like vibrato, or amplitude modulation anyway, and if you view the echo chips output you will see what looks like amplitude modulation as the repeats are added to the original sound.

Perhaps a better test would be to send a sine wave of short specific length into it, with feedback (and low delay time, say 50ms), and capture the output, which sohuld show bursts of your original signal with decreasing amplitude and increasing distortion (after a few repeats this chip will distort the signal, like most echo guitar pedals do).

I'm not suggesting the chip isn't "fake" but so far I haven't seen or heard the problem you say you have.  That doesn't mean it isn't there, just that your tests dont' convince me.
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