Respironics System One DIY Battery

Well, I just got a CPAP machine, and it’s amazing, I can sleep through the night now.  Yipee. Now I want to be able to use it if I’m away from power (or the power goes out) for a night or two, so I’m building up a battery pack to power it. The...
Inside the Fireface 800

Inside the Fireface 800

I had my fireface 800 apart the other day, and here’s what’s in it.  Click for higher resolution. Important chips are: AKM AK4396VF :  DAC THD+N: -86dB, SNR 100 dB JRC 4580: Dual Op-amp.  Input noise: 0.8uVrms typ. AKM AK5385AVF: ADC DR: 114dB, SNR 114 dB...

Things to try

I want to try making some PVA plastic. Ingredients: 50-50 water + white PVA glue Add a bit of glycerin, stir well Add filler — talc, or whatever you want. Add 4% borax solution, stir well....