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  1. TheEKey

    Comments for my PCM2702 DAC layout?

    Hello Guys, It happened that IC2 of my Bantam DAC was fried sometime ago. Call it DAC 1, using Elna RFS Silmic II as output caps. There's DAC 2, Wima as output caps. First I found that there were serious distortion from the music that I play from my PC. So I disconnected it and...
  2. TheEKey

    Comments for my PCM2702 DAC layout?

    Quote: Originally Posted by joneeboi Been there, man. Actually, I'm there right now. I've removed a 2702 before, and it tore off a lot of the traces. I just want to build a whole bunch of them just for the experience. I've got two ready to be built right now, so we'll see what...
  3. TheEKey

    Comments for my PCM2702 DAC layout?

    Quote: Originally Posted by tomb Actually, if you follow convention - Positive should go toward the DAC, Negative to OL and OR. This is because the caps are grounded through R5 and R6 at OL and OR and Ground is Negative on the PCB. It works (produces sound) in both way. Was...
  4. TheEKey

    Comments for my PCM2702 DAC layout?

    Hi Guys, After a long time struggle on my first bantam dac, I decided to give it up.... But I assembled 2 later and they are all working. Question in short, elna silmic II is signed, right? For using as CL and CR, how should I put it? Negative sign to output audio? Please advise. Matt
  5. TheEKey

    Comments for my PCM2702 DAC layout?

    Quote: Originally Posted by tomb Hey! Don't do this with it plugged in!!! The only time you should be making a measurement with the DAC plugged in is for voltage. I haven't found any short circuit between any of the legs..... Any clue? Matt
  6. TheEKey

    Comments for my PCM2702 DAC layout?

    Quote: Originally Posted by tomb Hey! Don't do this with it plugged in!!! The only time you should be making a measurement with the DAC plugged in is for voltage. I won't, don't worry. I love my life~! Let me check to see if there should be any short circuit first. Matt
  7. TheEKey

    Comments for my PCM2702 DAC layout?

    Quote: Originally Posted by tomb That's good.This should not require any additional equipment beyond what you used to check #1. Compare ..... I hope you are right. I actually fried my first Dac chip during the 0-resistance-test between neighboring legs...... There was smoke...
  8. TheEKey

    Comments for my PCM2702 DAC layout?

    Quote: Originally Posted by Hayduke SMD inspection is tough. I have a decent magnifier, but I still had trouble seeing those legs as well as ...... inspecting my solder joints though! Thanks for the tip, Hayduke. You reminded me of my stolen Canon Rebel :...( I am actually...
  9. TheEKey

    Comments for my PCM2702 DAC layout?

    Quote: Originally Posted by tomb DAC legs 13&14 and 15&16 are all tied to ground, so it doesn't matter if those legs are soldered together. The standard way to check the DAC..... See if there's short somewhere that's pulling that voltage down from IC2. 1) I have checked all...
  10. TheEKey

    Comments for my PCM2702 DAC layout?

    Quote: Originally Posted by tomb Yes - something's wrong with the IC2 circuit.Yes - it's not the PCM chip...... I appreciate your sonic speed reply, always. Thank god if that's indeed not related to the dac chip because I have just replaced it.... Please see the pictures...
  11. TheEKey

    Comments for my PCM2702 DAC layout?

    Hey guys~! I am stuck with getting the V across C13 only 0.7x V. From the voltage above, any chance we can know what's wrong with what part? 1) I thought it's IC2 and I changed a new one. No luck. Same voltage. 2) Could it be other parts besides the Dac chip itself? 3) IC1 works fine...
  12. TheEKey

    New Millett Hybrid Maxed Amp

    Quote: The VitQ's will also definitely make a difference. It's been stated many times, but I think the combination of ES's bypassed by VitQ's comes very close to the detail of Black Gates. __________________ TomB Quote: Originally Posted by BoilermakerFan And let's not...
  13. TheEKey

    A cheap-but-good DIY portable amp?

    Hello Kayito, HeadWize - Project: A Pocket Headphone Amplifier by Chu Moy I'm fairly new to DIY as well. In fact, this was my first project. Check the above link if you're looking for portable. There are ppl able to compile it into one mint box..... Hope this help TheEKey
  14. TheEKey

    New Millett Hybrid Maxed Amp

    Quote: Originally Posted by tomb Glad to hear you got it working! As far as a switch for the output caps, I'm not sure that would be a good idea. Even if it were just switching the bypass caps, the momentary charges and discharges might bleed through the switch with arcing. This...
  15. TheEKey

    New Millett Hybrid Maxed Amp

    Quote: Originally Posted by tomb First of all, thanks for all the photos. It will make trouble-shooting this a lot easier! The first thing I noticed is that perhaps you're wiring up the 3.5mm jack wrong in the first place. If I'm not mistaken, the longest lug coming off of the 3.5mm...
  16. TheEKey

    New Millett Hybrid Maxed Amp

    Quote: Originally Posted by tomb First of all, thanks for all the photos. It will make trouble-shooting this a lot easier! The first thing I noticed is that perhaps you're wiring up the 3.5mm jack wrong in the first place. If I'm not mistaken, the longest lug coming off of the 3.5mm...
  17. TheEKey

    New Millett Hybrid Maxed Amp

    Hello everyone, I'm new to DIY headphone amp and MHM is my second project. Anyway, I have a weird problem that I'm not able to debug. Please help. My built with no case yet It works generally The problem I have is sort of weird. To sum up, it works when I use 3.5mm plug but it...
  18. TheEKey

    New Millett Hybrid MiniMAX (what happened to this thread?)

    Sorry. post under the wrong topic. http://www.head-fi.org/forums/f6/new...ml#post5467283 I post it back to the Millett Hybrid MAXed topic.
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