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Class D Switching Power Amplifiers and Power D/A conversion

Behringer iNuke NU3000 w/o any fan...?
Behringer iNuke NU3000 w/o any fan...?
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Old 20th August 2019, 02:31 PM   #161
gadut is offline gadut  Indonesia
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Behringer iNuke NU3000 w/o any fan...?
i have used nu3000dsp for 2 years at home on low usage only on weekend, using stock fan because noctua small fan seems gone i put 4pcs of 68ohm 2W in series/paralel and it's best combination of noise/air flow. additional memory cooler should give extra cool down
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Old 20th August 2019, 07:13 PM   #162
Turbowatch2 is offline Turbowatch2  Germany
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I use these to regulate fan speed to an exceptable noise/ air flow level:

1 X LM317 Spannungsregler Step-Down DIY Set Dc Netzteil Modul | eBay

Not even a resistor is cheaper and it works on all fans up to 1A.
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Old 21st August 2019, 02:41 AM   #163
ashok is offline ashok
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Behringer iNuke NU3000 w/o any fan...?
Quote:
Originally Posted by Turbowatch2 View Post
I use these to regulate fan speed to an exceptable noise/ air flow level:

1 X LM317 Spannungsregler Step-Down DIY Set Dc Netzteil Modul | eBay

Not even a resistor is cheaper and it works on all fans up to 1A.

Isn't this just a voltage regulator ? You drop the voltage but it cannot increase if required ?
I thought the ideal situation would be if the fan speed is switchable ( automatically ) depending on the temperature of the component ( which one ?).
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Old 21st August 2019, 05:51 AM   #164
Turbowatch2 is offline Turbowatch2  Germany
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Yes, you decrease the voltage to a level where noise is acceptable and air flow sufficient for your application. If you use such an amp as intended for PA you have no need to throttle the fan. It is only for those who use them for HT or sub woofer, where the headroom is of interest, not the max. continuous output. For the few moments with high power demand the mass of the radiator will absorb the heat.
In practice the most annoying noise is eliminated if you cut just some volt, like from 12 to 10 volt, which leaves 90% of air flow.
If the fan is temperature regulated, you will not use it. For such an amp you should consider changing to a silent running fan.
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Old 21st August 2019, 06:16 AM   #165
gadut is offline gadut  Indonesia
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Behringer iNuke NU3000 w/o any fan...?
i recon my final voltage was around 9.5V, which is less audible noise even 10cm from the fan but still produce decent amount of air flow. after using the amplifier for my subwoofer during movie time, checking with IR termometer shows only around 40C on the mosfet

i don't think any fancy temp control fan required for home usage, just stick on lower noise but decent airflow
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Old 21st August 2019, 03:15 PM   #166
ashok is offline ashok
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Behringer iNuke NU3000 w/o any fan...?
Quote:
Originally Posted by gadut View Post
i have used nu3000dsp for 2 years at home on low usage only on weekend, using stock fan because noctua small fan seems gone i put 4pcs of 68ohm 2W in series/paralel and it's best combination of noise/air flow. additional memory cooler should give extra cool down
How is the heatsink bonded to the Power device ? Some sort of glue ? Would it be able to transfer heat efficiently from device to the heat sink ?
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Old 21st August 2019, 03:22 PM   #167
gadut is offline gadut  Indonesia
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Behringer iNuke NU3000 w/o any fan...?
originally it has a flat heatsink - took it from google because i did not take mine - which is easy to bond using thermalpaste and power glue on the corner side just to keep them connected
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Old 21st August 2019, 04:20 PM   #168
MAAC0 is offline MAAC0  Portugal
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Look at Sony MHC Amp series schematics. They provide low / high voltage for the fan depending on Volume setting.
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Old 22nd August 2019, 08:42 AM   #169
ashok is offline ashok
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Behringer iNuke NU3000 w/o any fan...?
Thanks Gadut , Turbowatch2 , MAAC0and others.
MAAC0 have any model numbers for the Sony ?
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