Nexus 5 / Android Headphone Voice Search Fix

After updating my Nexus 5 to Marshmallow I started encountering a strange issue. When listening to music/podcasts the voice search activated frequently and prompted: “To do a Google Voice search, please unlock your phone“. If I would walk with my phone in the pocket this would sometimes happen every 2 seconds, which was extremely frustrating.

I spent several hours trying to find a software fix, but even though the problem seems to have been around for years there is still no official fix. My research revealed that the problem is that my phone thinks I’m using a headphone with a built in cable mic. I’m using regular headphones with a TRS plug though. I could have purchased different headphones to fix the problem, but I really like my current headphones and didn’t want to buy new ones.

Audio-Plugs-BBB
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Nexus 5 / Android Headphone Voice Search Fix

CMoy Headphone Amp

A while ago I came across a picture of a headphone amplifier in an Altoids tin. Even though I don’t have headphones that necessarily require an amp (Audio-Technica ATH-M50) I decided to go ahead with the build. It’s an easy enough project to build in a weekend. I followed this excellent tutorial with a few modifications. I built the single 9V battery version. I ordered all my components except the pot from DigiKey. I ordered the pot from Mouser. I still had a bunch of perfboards lying around from previous projects and used one of them. The total cost for the parts came to around $30. Unfortunately DigiKey doesn’t show you the shipping cost on checkout and to my surprise they charged me $30 for regular UPS ground shipping. I contacted their support and apparently there is a shipping cost calculator link somewhere during the checkout process. Seriously DigiKey, it’s 2015, update your website.
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CMoy Headphone Amp