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  1. error401

    Any experience with ADuM4160 usb isolator ?

    Pads are provided to wire an external +5V supply if you don't want to use the onboard one.
  2. error401

    Any experience with ADuM4160 usb isolator ?

    I've built one of this guy's kits. No idea what it does for audio, but it works fine for my non-audio-related purposes: ADuM4160 USB Isolator board, bare PCB and kits « Circuits@Home
  3. error401

    Alternate volume controls

    I designed a PGA2320 board quite a while ago as well: MiniVol PGA2320 Volume Control - error404's Audio DIY Endeavours Nobody was interested
  4. error401

    Rotary Encoder board for Arduino/LCDuino

    Quote: Originally Posted by Juaquin I2C is two pins. It could be done with the existing board (breakout pins) but I wanted to simplify. Honestly I haven't done a lot of research on the communication aspect yet (I had to have something to do during the 3 week wait for boards) and I'm...
  5. error401

    Rotary Encoder board for Arduino/LCDuino

    Looks fine to me. My only concern is how you're going to address it on the bus, adding some jumpers/DIP switches is probably prudent since you don't have a hardware 64-bit unique ID and programming it manually for each device is a pain if you ever plan to build more than one. I'm curious...
  6. error401

    Interest Check: PPAS redesign?

    Sorry guys, I've been totally AWOL for months, my personal life has become a bit too insane to keep up these projects, and probably will be for a while. Anyone is welcome to take up the reigns though, if you want the current Altium files or anything just send me a PM and I'll get them to you...
  7. error401

    Carrie USB-Powered Headphone Amplifier

    I finally received the rest of my parts from Mouser last week, and today I got around to building up the Carrie board. I used the posted BOM in the 2nd post and pretty much ordered what was on there. I haven't had a chance to hook it up and test it yet, but I did have a few build notes. I...
  8. error401

    My new 3 watt dead-silent USB Linux music server. Pics Added.

    Just wanted to say thanks for giving me this idea. I've been using the ALIX boards as pfSense firewalls at my clients' for a year or so now, and they're great. Never thought to set them up as mpd boxes though, that's really genius, and I'm going to build one up this afternoon. Cheers...
  9. error401

    Interest Check: PPAS redesign?

    Quote: I agree with TzeYang that w/o FET isolation it technically isn't a PPAS. I think that may be the last 1% or something like that. I think this is a great sounding amp in small package. There really is a need for an amp like this. Exactly my dilemma. I haven't found a way to...
  10. error401

    Interest Check: PPAS redesign?

    Does anyone have any input on the proposal to remove the JFET isolation? Any prototypers willing to try jumpering the JFETs and reporting on sound quality changes if any?
  11. error401

    Help getting into microcontrollers

    Both the Arduino boards I linked are pretty small. The Boarduino DC is about half the price, much smaller, but doesn't include the USB->RS232 IC. The USB Boarduino is still quite a bit cheaper and smaller than the 'official' one and does include it. Both have bare boards available, and so are...
  12. error401

    Help getting into microcontrollers

    Quote: Originally Posted by jcx how about a $20 development system in a usb key fob MSP430 USB Stick Development Tool - EZ430-F2013 - TI Tool Folder also 16 bit is too cheap today to waste the time with 8 bit processor limitations Or get 16 bits extra for only $5...
  13. error401

    Help getting into microcontrollers

    ...has a great community and is by far the easiest solution available. If you're in it to learn how the stuff really works inside, pick an arch (*AVR*, PIC, ARM, 8051, 68HC11, etc...) and go buy a cheap development board, programmer (if necessary), and prepare to read that 600 page user guide...
  14. error401

    IC: Modular USB Power Supply

    It'd be nice if you broke out the data lines.
  15. error401

    Interest Check: PPAS redesign?

    Removing the JFETs isn't an issue, in fact I think that'd be preferable really. But to keep the original PPAS design I'd have to keep the JFETs and use them only for the opamp supplies. That's where I'm having layout difficulties. But if everyone is in favour I'd rather just rip them out. The...
  16. error401

    Interest Check: PPAS redesign?

    I've been very swamped with work the past few weeks, but the bug that TzeYang noticed has so far been defeating me. It seriously complicates the layout since the (now) two sets of power rails cross in several places. I'm not sure I have the motivation to completely ripup the board and redo it...
  17. error401

    Carrie USB-Powered Headphone Amplifier

    Quote: Originally Posted by joneeboi I also read on this thread that power will be readily available from the USB regardless of enumeration. I hope that that's true. diyAudio Forums - USB powered HIFI headphone amp/DAC - Page 1 Yea, you can pretty much assume at least 1A will be...
  18. error401

    Interest Check: PPAS redesign?

    Quote: Originally Posted by tcpoint One quick note. Shouldn't the power to the buffers be Vdd and Vee instead of Vp and Vn, respectively? The Q3, Q4, Q6, Q7 Jfets are supposed to isolate the rails for the opamps, not the buffers. The original PPAS does this. I think you're right...
  19. error401

    Carrie USB-Powered Headphone Amplifier

    ...consistent connection without solder or compression. Quote: What is the max power/current draw of the AD8397? (Iq (per amplifier) * number of amplifiers) + dynamic load current Probably your average load current is going to be very small or you're going to be damaging your...
  20. error401

    Dead BUF634

    How can you parallel a BUF634 with a TLE2426? They have different functions and that notion doesn't really make sense.
  21. error401

    Interest Check: PPAS redesign?

    Yes! It's done! http://audio.gotroot.ca/ppas/PPAS_placement.pdf Most labels are directly over the part in question. If anything is unclear, suck it up and read the schematic :P Oh, do note that the layout is already updated for the pot bug, so that area looks little different, but the...
  22. error401

    Non-SMT DIY DAC?

    Don't be so afraid of smd! It's really not as hard as it looks; if you need an ultra-fine-point soldering iron for success, you're probably doing it wrong. Once you get the hang of it 1206 and 0805 sized passives are dead easy, and it's a lot more efficient than through-hole parts because...
  23. error401

    Interest Check: PPAS redesign?

    I'm not totally sure what that warning is about, but I'm sure you don't need to worry about it.
  24. error401

    Gotta give credit to Digikey... They rock!

    Quote: Originally Posted by wolf18t Since when Digikey carry RN55D resistors? At least a year or so, when I noticed them available. I've ordered them many times now. They are technically not RN55 series as CMF55 is the commercial variant, but physically they're identical. As far...
  25. error401

    Interest Check: PPAS redesign?

    Sometimes I wish I didn't have e-mail notifications on :P Quote: Originally Posted by Datasheet summary The LME49720 is unity gain stable.
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