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  1. TheLaw

    pupDAC Step-by-Step Build Thread

    Hey all,   Does anyone know the hole diameter for the four PCB mounting holes?   Thank you very much in advance.
  2. TheLaw

    pupDAC Step-by-Step Build Thread

    Hey guys,   I built a GrubDAC a while back and it sounds great. However, my one gripe with it was that Windows 7 didn't like it all too much. If I wanted to change the volume, I had to go into the advanced mixer and change the volume on each program separately. I could not simply pull the...
  3. TheLaw

    DIY USB PSU?

    Ehh don't waste your time. I don't think. The ripple on the 5V rail of your computer can easy be dampened with some high value capacitors.You could also use a filter network to get rid of the junk on the rail if it really concerns you.   If you are still convinced, It's as simple as an...
  4. TheLaw

    Electret Mic -> Headphones: Stages?

    Thank you so much. Makes sense.
  5. TheLaw

    Electret Mic -> Headphones: Stages?

    Right thanks! I realized that I had just said something dumb. I know what a buffer is. Dur!   However, Just a question, why does the signal need to be buffered? I understand what these stages do, but I'm not quite fully understanding the theory behind all of them. The microphone is a high...
  6. TheLaw

    Electret Mic -> Headphones: Stages?

    Alright thanks.   Electret mic -> Buffer -> BP Filter -> EQ -> Headphone amp -> Headphones   How that sound?   What kind of buffer is that? Current/voltage?
  7. TheLaw

    Is the Clip Zip's hardware inherently unreliable? Or is it the software?

    Is FAT32 slower than NTFS?   I still find it absurd that they can pack 64GB of storage into a a microSD card. I'm not old. I'm 18, and I remember when my computer's hard drive was like 400MB. Sheesh.   Thanks.
  8. TheLaw

    Is the Clip Zip's hardware inherently unreliable? Or is it the software?

    Thanks a lot for the replies. I think I am going to purchase one. Seems like an excellent value. CZ + a 32gb SD should do me very well.
  9. TheLaw

    DIY Lab Power Supply

    Arrows build is simple and well designed. The only thing I want to add is perhaps instead of using two potentiometers to adjust voltage on both rails...you can use a circuit like this:   LT150A is EOL or discontinued I believe, but it can be replaced with another regulator like an LT1083 or...
  10. TheLaw

    The GrubDAC

    Oh I'm not blaming TI. Even though TI has huge market share...whether they got there fairly or not...I don't know, I like them.   Just wanted to comment on the actual GrubDAC. I'm using this hooked up to a homemade power chipamp. About 50Wx2 + 50Wx1 (sub). Bass is so much more punchy. I...
  11. TheLaw

    The GrubDAC

    So can it would be a pain in the dupa, but can I solder on a PCM2706C?
  12. TheLaw

    The GrubDAC

    Well I'm on a computer that is shared amongst people in my household. So I can't just suddenly have the volume slider not work...   The problem confuses me a lot because traditionally the volume bar with control all of the programs volume at once. In the mixer you can set each individual...
  13. TheLaw

    need help finding a chassis mount 3.5mm female jack

    I know the job is all said and done...however, I use this jack for all of my chassis 3.5 stuff now. I know the picture isn't very good on Mouser...but from personal experience, it's a really nice jack. Gold plated. Threaded isolated plastic housing. Solder lugs.  ...
  14. TheLaw

    Basics of headphone design- Pointers?

    Hi,   I'm starting a new project with microphones and some long range microphone listening devices. Yadayada...   Well amidst this, I thought it would be neat to make headphones for the project...well, just because.     So I'm sure there are resources around. Does anyone have any...
  15. TheLaw

    Open Source "Hearing Assistant/Aid".

    Hmm since I probably won't need a hearing aid for another 50 years, maybe I'll change the direction of this project to something like..yes..a "spy" amplifier as you have linked to.   It would be MUCH easier to do this via a single unit versus trying to futz around wtih having half of the...
  16. TheLaw

    Open Source "Hearing Assistant/Aid".

    Also RE: parabololic reflectors, how would YOU implement them?
  17. TheLaw

    Open Source "Hearing Assistant/Aid".

    Righto. Do you think it would be overly ambitious to try to put the mic preamps in the headphones?
  18. TheLaw

    Open Source "Hearing Assistant/Aid".

    Avro, thank you for the continued response.   Would LME49720 work alright for the mic preamp? Then use it again for the active equalizer. Then perhaps an AD823 or OPA2134 for the "cMoy" section.   I've never designed heaphones from scratch, so I might just experiment with that first.  ...
  19. TheLaw

    Open Source "Hearing Assistant/Aid".

    Right. I was getting a little to comfortable just asking questions. So according to this...Preamping is necessary, as you tried to tell me, but I was too ignorant of course.
  20. TheLaw

    Open Source "Hearing Assistant/Aid".

    Thanks!   If a sensitivity of a mic is negative and that calculator says that it is voltage loss? What does that mean...? Is that not the output voltage?   What is a typical line level voltage?
  21. TheLaw

    Open Source "Hearing Assistant/Aid".

    Oh right. How dumb of me.     This is essentially what an electret condenser mic looks like. It's already preamplified, though I'm not sure exacty what voltage it would output. Do you still reckon it's too low if all I want to do is drive a pair of headphones?     Thanks.
  22. TheLaw

    Open Source "Hearing Assistant/Aid".

    Okay thank you both.   I've been thinking. If I do not have a cable run, does the microphone still require a preamp stage? The LME49990 is super low noise but I doubt it could actually drive a 150ohm load, so essentially I use the LME49990 to cleanly boost the voltage a bit, and then run it...
  23. TheLaw

    Best DIY kit for the money $250ish

    cMoy? ;) =P jk.   Starving Student?
  24. TheLaw

    Install bigger flash drive into iPod Nano 1G

    Not unless you feel like desoldering the SMD memory chip, finding a suitable replacement and rewriting the tinkering with the Apple firm ware to get it to be recognized. Get a new iPod/mp3 player. ;)
  25. TheLaw

    Must wear IEMs all day. Suggestions for good sound isolation, comfortable, cheap customs?

    I like Sennheiser CX300-IIs, but they are a tad bit heavy on bass. The original CX-300s, which I also have, are almost pure bass.   If you are going to be wearing them all day, you might consider some CX-270s or CX-200s, which are cheaper and a little bit more balanced. Cheap as in like...
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