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PT2399 is bad

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Jan Audio:
Hi, i have these delay ICs : PT2399
They mess up the audio at the input, like amplitude modulation.
Even if it is not connected it disturbs the audio elsewhere.
How van these ( fake chinese ) parts be so bad ?
Any clues ?

thanks

CJay:
The answer is that they aren't, I've used a few of them in repairs and they work fine.

They're not HiFi but they're good enough for the purpose (CB radio echo boards)

Maybe you have fakes or a problem elsewhere?

Jan Audio:
They are fake for sure, i ordered them in china.

They all work good for the rest, its someting you wont notice directly.
With feedback it is clearly visible, wihtout feedback there is only once a small offset,
it occurs when changing frequency, use pitch modulation on high tones, then the scope shows clearly amplitude modulation on the delay time frequency.

Mechatrommer:

--- Quote from: Jan Audio on June 11, 2019, 12:43:58 pm ---How van these ( fake chinese ) parts be so bad ?
Any clues ?

--- End quote ---
yes i got a clue... the answer is in the question (bracket)..

Jan Audio:
Yes i understand, only how can a part be so bad internal that it ruins the signal elsewhere ?

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