Electronics > Beginners
The "I made this!" thread - Beginners achievements with pride.
BrianHG:
--- Quote from: jerryk on March 15, 2018, 05:08:05 pm ---My security upgrade is now in its final resting place next to the old system I had installed over thirty years ago. The enclosure was an obstacle by itself but worked out in the end.
I did make a few mistakes in the final board run. The main power plane connecting all of the 220 resistors to the optocouplers had a tiny gap that mean I got to solder bridge all the resistors to that plane. I created a couple of unconnected islands that had to have belated vias installed. I omitted a control wire from the pi to the adc, hence the jumper wire around the pi pins. With a few more ugly solder bridges here and there it actually works as planned. The biggest goof was mounting the pi mirror image to my intentions. It was supposed to go directly under the board and not staggered. I spend so many hours checking so many things and missed that one! Regardless of the stumbles, it's functionality is beyond my expectations. The best part is remote control of the keypad. Unravelling the serial code used to control it took a while but the ease of making changes to the panel via a computer instead of the dreaded keypad is worth the effort.
Thanks to all of you that helped me in this project.
Jerry
--- End quote ---
I still love that 'Harmful if swallowed...' comment on your silkscreen. :-DD
IsabellaMiller1950:
--- Quote from: BrianHG on March 13, 2018, 10:55:39 pm ---Finally, built 2 Subwoff PCBs. Audio samples coming in 2 days. I'll be looking through Youtube movie previews & use one as an audio reference & provide 3 samples of original, Subwoff enhanced mixed audio and subsonic only at full blast.
--- End quote ---
Congrats! Does it meet your expectations while using? :)
BrianHG:
--- Quote from: IsabellaMiller1950 on March 16, 2018, 10:29:46 am ---Congrats! Does it meet your expectations while using? :)
--- End quote ---
It's great for older material before 2005, gives it a modern feeling. For newer stuff, it's insane! My neighbors don't like me anymore.
.mp3 sample demo here: https://www.eevblog.com/forum/projects/free-subwoofer-audio-processor-project-for-forum-members/msg1453438/#msg1453438
paulca:
It lives!
Binary clock. First PCB I ever designed. Though it arrived after my second PCB.
ATMega328P, DS1302 RTC w/ 3.6V NiMH battery, TLC59282 LED Driver, Adafruit 128x64 oLED.
The most surprising thing is... I have found zero errors so far. It worked out of the bag. Quite surprised.
In the photo it's running off an 18650 laptop cell, I have TP4056 board to allow charging. Just wondering about a case now.
paulca:
So I made a sound card. A USB one. Based on the TI PCM2904 USB DAC. Works a treat, both output and input. No drivers needed, appears as "USB Audio Codec" in windows and Linux. Will drive a pair of headphones at nanny state level, but put it into a decent headphone amp and you will find it is not short of gain.
All SMD with the exception of the white power LED. Air soldered with an 898 clone. All components ordered from RS Components. It wasn't exactly cheap though. BOM and boards for 2 + left overs was about £100.
Designed in KiCad with lots of help around getting the output filter designed from the kind folks on here. Ended up using a butterworth filter from a TI Application/Design note/Demo board.
Full sources for KiCad is available here:
https://gitlab.com/paulcam/PCM2904_DAC
Board manufactured by AllPCB for $22 including shipping which only took 6 days end to end. I ordered 5, they sent 10. The boards would have been $15 but I wanted blue solder mask which added $7.
(On the topic of gain, if you want to drive headphones (at all) or an headphone with a bit of kick, swap R8 and R9 for 3.9K instead of 12K.)
It's mind boggling to think I went from asking dumb questions about Ohm's law in October to making a full USB sound card device this week!
Oh and.. jerryk, you have started a trend with your "Harmful if swallowed."
"For external use only!"
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