Bias power at 6.0V instead of 5.0V after soldering jumpers?

[Scott_Veirs]

Hey @Giedrius,

My colleague Joe and I decided to try utilizing the Pisounds bias power first – under the theory that it is likely cleaner than what we could get from the Raspberry Pi (pins or USB ports). We may try both/other ways eventually, but wanted to see what you thought of this approach:

1. Joe soldered 10kOhm resistors between the jumper positions and the middle/left pin of the input jack, like so:

2. We plugged in the Raspberry Pi (via POE) and tested the voltage (via a 90-degree stereo 1/4"-1/8" jack and this stereo-mono splitter) and got 4.95V on the mono input jack (where Joe’s hydrophone wants it). Here’s one view of the result:
   
   

I’ll be testing this new hydrophone set up over the next week and will share how it goes. In the interim, do you have any opinion about whether we should replicate this approach for future hydrophone systems, or do the electronics in some other, better way?

Thanks for all your support and interest,
Scott in Seattle (WA, USA)