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Chip Amps Amplifiers based on integrated circuits

Neurochrome LM3886DR Build
Neurochrome LM3886DR Build
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Old 16th July 2018, 02:10 PM   #411
rsqt is offline rsqt  Germany
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Is it possible by changing the coil to lower the noise (mid horn running only up to 1kHz/18-24dB/oct)?
About115dB/1W is a lot and together with a DSP it is a bit noisy.
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Old 16th July 2018, 05:58 PM   #412
tomchr is offline tomchr  Canada
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Put a shorting plug on the input of the amp. If the noise level drops to an acceptable level (preferably well below audible at the listening position), messing with the amp won't change anything. You'll have to get a quieter DSP.

Messing with the output inductor will not change the noise level of the LM3886DR. You might be able to lower the noise a bit by messing with the feedback networks around the LM3886. Ensuring stability across the entire signal swing while doing that is a challenge, however.

Tom
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Last edited by tomchr; 16th July 2018 at 06:01 PM. Reason: Context
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Old 16th July 2018, 09:02 PM   #413
BrianL is offline BrianL  United States
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Neurochrome LM3886DR Build
rsqt,
The output inductor is part of the RL network to help assure the amp's stability with odd loads. It is not a noise filter.
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