07/24/2015 at 04:44 •
Apologies those few people following this project, as I have had to take a nice vacation in Alaska. Motorcycling through that state definitely is the best way to explore the vast, untouched expanses of the world.
Sometimes, you just have to get away from the bustling tech-filled life and enjoy the true outdoors for a week.
Anyhoo, I got boards back, placed components on the PCB with hours of non-sober soldering, turned on the power supply, and realized it was hitting its current limit pretty quickly. No smoke, but definitely warm components. I've identified it to be somewhere near the SPDIF receiver (which is strange because I've used that same part before). Right now it pulls ~100mA, where it should be pulling only 25mA or so.
I also noticed that I completely forgot to assign the pins to the PLL power supply on the ADAU1701. Whoops, but that's why I prototype with leaded packages!
Modifications are on the way, but work is busy and I am moving in the next two weeks. Don't expect miracles =]
06/30/2015 at 06:15 •
I've been having a little bit too much fun with OmniGraffle (which rocks, by the way for making block diagrams and simple 2D designs and such) lately, so I just posted some renderings of top/bottom/side views of this thing with some dimensions. I'm pulling the trigger now on buying the speaker components now that the board is in fab.
Speaking of board fab, I am now 3 for 3 when it comes to automatic upgrades to Super Swift Service from OSHPark! Shameless plug for them, they are awesome and have always provided excellent-quality boards with legit ENIG finish (not the old-school tin plating which corrodes after a long time). Also with free shipping, they aren't that much more expensive than Chinese vendors and they arrive in much less time. If you're building less than 10 units, I say it's worth the extra 15-30% to get cool purple quality PCBs. And no, I don't work for or have friends that work for OSHPark, they are just a wonderful little company.
I've found that ordering boards on a Sunday has worked out for me very well. They should ship next Monday.
In the meantime, please have a look at my subpar drawings and comment away!
06/29/2015 at 16:03 •
I just finished the board and placed the order though OSHPark. Only $45 shipped for three boards!
I've also finalized my speaker driver decision as well. Due to my limited access to tools, I wanted to be able to simply cut holes in wood with a scroll saw and mount the drivers on the outside to cover up any nonuniformities. I found some great drivers on Parts Express that will do the trick:
Tymphany BC25SC55-04 1" Square Frame Tweeter
Dayton Audio DS115-8 4" Designer Series Woofer Speaker
I'll be ordering these shortly as well as a bass port. Considering I just started actually working on a schematic perhaps a week ago, this is coming along pretty quickly! Here's hoping my boards find a spot on an almost-full panel and I get a free upgrade to their super-quickturn service again...