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Chip Amps Amplifiers based on integrated circuits

Yamaha MT1X headphone amp
Yamaha MT1X headphone amp
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Old 14th November 2017, 03:06 PM   #11
Depaj is offline Depaj  France
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Okay, I think I have some 120ohm 2W resistors that should do it
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Old 14th November 2017, 03:11 PM   #12
Mooly is offline Mooly  United Kingdom
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Yamaha MT1X headphone amp
Work it out. Its AC coupled and runs on 10 volts. Lets call it 12 for good measure. Worst case would be running into a short circuit and here the resistor would see a theoretical -/+6 volt swing.

W = Vsquared/R so we have 36/120 which is 0.3 watt dissipated (worst possible case). A 0.25 watt would be fine in practice.
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Old 14th November 2017, 03:23 PM   #13
adason is offline adason  United States
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Mooly is right, still i see these often bigger than small signal resistors
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Old 14th November 2017, 03:28 PM   #14
Depaj is offline Depaj  France
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That was my first thought as well but I wasn't sure so I went with the 2w I had. It sound better that the 800ohm but not all of the hiss is gone so I'll try maybe 200 or 250.
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Old 14th November 2017, 04:22 PM   #15
Depaj is offline Depaj  France
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It works perfectly with 220ohms, thank you for your help
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Old 14th November 2017, 05:50 PM   #16
Mooly is offline Mooly  United Kingdom
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You're welcome
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