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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: reducing bandwidth in BB 2604 opamp posted by rhyno on November 11, 2006 at 07:30:16:
Howdy there rhyno,Hiss is usually a broad band type of signal, aka white noise. The hissing may be pointing to a new ability of your circuit to pull in RF garbage. You don't mention what type of opamps you replace but if the BB part has much higher impedance inputs than what you replaced then it may be that the BB parts are allowing you to realize the shortcomings of a preexisting problem with the layout. You see, since each circuit board trace has length they will have some ability to recieve radio waves. Tune the lenght of a trace just right and put a high enough impedance load on it (such as a high impedance op amp input) and if the shielding is not sufficient then the RF noise in the ambient environment can suddenly show up in your music.
One way to deal with this if it is the problem is to retune the antenna. Usually this is best accomplished by making the node as short as possible. Maybe you could mount the new op amp in such a way that input interconnects are reduced in length compared to what they are now.
Another way to deal with the RF problem would be to use a lower impedance input op amp. Less impedance will result in less signal swing of the unwanted signal on the high impedance node. It is a game of tradeoffs between SNR and distortion though.
Sheilding the recieve trace or the noise source will also work. This can be the most effective solution but often will end up being one of the more difficult to do right solutions.
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Follow Ups
- Re: reducing bandwidth in BB 2604 opamp - Ugly 11:26:29 11/13/06 (0)
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