Pro Audio Design Forum

The second channel that stopped working, which had previously passed signal at default gain, started acting the same as the other channel ie no signal was passing and then the microphone diaphragm started whining. I figured this had to be a short in the chip itself. Replaced the chip and it's workin...

Got real close to finishing today, then problems. 5 channels were working well. I passed signal through all working channels and the preamps sounded really good. I can't remember exactly the sequence of events following but I had phantom on (accidentally) the non-working channel with an sm-57 for te...

I think you're way overestimating my skills. Actually I did a lot of them wrong, and then did the rework wrong. If you follow sop you just get a stencil (which I did not do), put paste on and hot air them and they should be not so hard. I was using hot air btw and just doing touch ups around the edg...

Moving along... I stuck a .1u cap in the reset rc, didn't work. Then tried a 22u and it seems to be working. Things got a lot more stable. Next I rewrote a lot of the code on the arduino and android so that only actual gain register data was being displayed. Every change on the android gain display ...

No such thing as a non-answer, every little bit helps. More info and thoughts: When using the rfduino programmer my CS line measures 1.7V. With my power supply CS is 3.3V. It should theoretically be high/non-active since no data is being sent when probing. I just remembered today that when I was des...

Current problem I need some help with I've been testing the channel cards' spi gain settings by using the arduino serial monitor. Mostly all channels work, with gain increments being displayed properly. I say mostly because there is some intermittence here and there on 1 or 2 channels, but unpluggin...

JR thanks for the input. It's sort of over my paygrade, I'm still in the barely able to get it working stages. btw rfduino is just an arduino (modern pic mcu) plus a bluetooth module. One step forward two back. It looks like noise problems are solved. I fired it up with both the p/s card and a batte...

FInally I got an answer about systemoff() on the rfduino. It's a real poweroff (duh, the name does say so), but the docs implied that it was more like running in ultra low power mode. So there was a good reason I could not wake the thing up. I'm going to just do another revision on the rfduino adapt...

Working on the wake-up code to wake up the rfduino from shutdown. So far it's not working. Also, can someone help with this... https://1580mixer.shutterfly.com/pictures/59 Along the top edge you can see a trace where I'm bussing the input jack shields. I think I'm going to change jacks to a more sec...

No, it will likely still be noisy again as soon as the ble stack starts up. But that's not the intended use. Once I set the gains, that's it, on to recording. If I want to tweak gains after an initial setup, I don't care if noise is present again since I won't be recording. For a professional produc...