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Butte vs O2
Butte vs O2
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Old 24th October 2019, 07:47 PM   #11
xrk971 is offline xrk971  United States
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Butte vs O2
I think AGDR's excellent implementation of a compact OPA1688 should be considered by anyone looking into an O2 or a Butte, or any other opamp based headphone amp. The power supply cut-out system and the power-on relay management system is excellent.

OPA1688 Super CMOY, 2x 9V with real ground and headphone relay - PCBs
XRKaudio https://www.etsy.com/shop/XRKAudio
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Old 24th October 2019, 09:46 PM   #12
adydula is offline adydula  United States
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I totally agree, I have built three of them all EXCELLENT!

One is in Thailand and the other is in France!

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