Search found 56 matches

by weroflu
Fri Oct 13, 2017 12:34 am
Forum: Pro Audio Design
Topic: That1580 mini mixer
Replies: 105
Views: 321643

Re: That1580/1510 mini mixer

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...
by weroflu
Thu Jul 06, 2017 8:34 am
Forum: Pro Audio Design
Topic: That1580 mini mixer
Replies: 105
Views: 321643

Re: That1580/1510 mini mixer

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...
by weroflu
Thu Jul 06, 2017 7:43 am
Forum: Pro Audio Design
Topic: That1580 mini mixer
Replies: 105
Views: 321643

Re: That1580/1510 mini mixer

I'm not sure I explained things well. The two obvious noise artifacts that were being generated from the rfduino are solved by putting it in a ulp mode (that can be woken up). So these are now a moot point. I never implemented the usb connection to the phone. Noise is now the same with the rfduino c...
by weroflu
Tue Jul 04, 2017 3:18 am
Forum: Pro Audio Design
Topic: That1580 mini mixer
Replies: 105
Views: 321643

Re: That1580/1510 mini mixer

Probably you were correct about a floating Rg connection. These were all problems from bad qfn joints. I retouched 3 more channel cards and it looks like they are all good. There were 2 sources of noise from the rfduino still audible and one from ambient noise sources/power supply. While in ble adve...
by weroflu
Fri Jun 23, 2017 10:14 am
Forum: Pro Audio Design
Topic: That1580 mini mixer
Replies: 105
Views: 321643

Re: That1580/1510 mini mixer

I spent some time testing the bluetooth to rfduino gain control. The following works: All channels populating the chassis, rfduino connected to arduino serial monitor via uart cable. Usb powering the logic bus, all other rails unpowered. gain settings printed on the serial monitor. This also works: ...
by weroflu
Wed Jun 14, 2017 9:16 am
Forum: Pro Audio Design
Topic: That1580 mini mixer
Replies: 105
Views: 321643

Re: That1580/1510 mini mixer

Catastrophic hard drive failure, had to rewrite arduino and android code. Thankfully I had all schematics backed up properly. drv135 test tone board done Android ble app now functional - transmitting bluetooth data to arduino. The dread in programming this was not imagined. All 6 channels now finish...
by weroflu
Wed May 17, 2017 3:48 pm
Forum: Pro Audio Design
Topic: That1580 mini mixer
Replies: 105
Views: 321643

Re: That1580/1510 mini mixer

LIttle update. 5 cards done and working, but not rigorously tested yet. Just from quick testing with a 57 the preamps sound great. Waiting on the drv135 board. I added a cypress usb uart to the rfduino board and was able to squeeze in a microusb footprint on the chassis, waiting on that board as wel...
by weroflu
Fri May 12, 2017 5:32 pm
Forum: Pro Audio Design
Topic: That1580 mini mixer
Replies: 105
Views: 321643

Re: That1580/1510 mini mixer

Haven't yet checked the power rails. I got stuck on these qfn32's again. FInally got one more done after a zillion tries, either not enough solder on pads, too much on the thermal or something else. Card #4 has the 5171 on, it seems the rest of the populating is fairly easy once that's done. Card #5...
by weroflu
Wed May 10, 2017 9:39 am
Forum: Pro Audio Design
Topic: That1580 mini mixer
Replies: 105
Views: 321643

Re: That1580/1510 mini mixer

Nope spoke too soon. Very low level rhythmic clicking audible if I turn up the headphone volume. 3-4 per second. Forgot I enable bluetooth broadcast in preparation for the next round of coding torture. RFduinoBLE.advertisementInterval = 250 hmm, 250ms x 4 sounds about right. Disabled bluetooth broad...
by weroflu
Wed May 10, 2017 8:04 am
Forum: Pro Audio Design
Topic: That1580 mini mixer
Replies: 105
Views: 321643

Re: That1580/1510 mini mixer

Update Two channels now working pefectly through the whole signal chain, preamplifier, spi gain set, pan and sum, no noise. edit: the clicking was caused by something on the summing card. I reseated or replaced, can't remember, the lme49720 and that did it. I have tentatively decided to stay with th...