| Electronics > Projects, Designs, and Technical Stuff |
| 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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