Recent content by doors666
  1. doors666

    The Opamp thread

    i am trying to make a cmoy like thingie using ne5532 (thats all i have at hand in duals at present, might replace later). power right now is from 7815/7915. I am using r2=27k, r3=33k, r4=150k. Load is a 330R resistor. Ckt is here. Cap is presently 0.1uf for testing, will increase it later. ckt...
  2. doors666

    Trickle Chargers

    I checked the output resistance of the 7812, its listed at around 15 milliohms while the tenergy 9v rechargeable is listed at max 1200 milliohms.   http://www.synthdiy.com/files/2006/LM7812.pdf   http://www.all-battery.com/datasheet/10001_datasheet.pdf   It doesn't look like the resistor...
  3. doors666

    Trickle Chargers

      I was asking about the battery as a load while charging it, not as a source. Just to test the circuit in ltspice.   I guess i gotta live with option 1. I think 2 would require me to disconnect the batteries when they are charged or it might damage the batteries or would need some detection...
  4. doors666

    Trickle Chargers

    I am trying to use the charger from o2. I am  using a single battery and will be using dc input, say a 15v walwart, this is to drive a cmoy based on ne5532.  Attached is the circuit I am trying to simulate. I had a few questions about this.   1. How do I simulate a battery. What would be the...
  5. doors666

    Starving Student PCB's

    There are no mounting holes. How have you guys mounted it on the chassis. The only thing i see is the pot that can be mounted, but is that mounting strong enough to hold the pcb and the tubes. I was actually thinking of ditching the pot, but looks like i might need it... Any issues with a 100k...
  6. doors666

    Millett "Starving Student" hybrid amp

    I am eagerly waiting for the pcb for the 12au7 version.I have the cisco 0.38a supply, headphones are realistic pro30 (32 ohms) and koss porta pro (60 ohms). Chain would be PC->ODAC->B1 preamp->SSMH. I have a few doubts that wanted to clarify while I wait for the pcb to arrive. 1. Is there an...
  7. doors666

    Starving Student PCB's

    Ok, I made a mistake, I see that both triodes are being used for a single channel and both the triodes in a tube are shorted to each other.. I dont understand why its done like this though.
  8. doors666

    Starving Student PCB's

    i expect to see one tube, but in the first post of this thread, the pcb images and completed build pics have two tubes.
  9. doors666

    Starving Student PCB's

    In the schematics, I see a single triode being used for each of the channels, but in the build pics and pcbs, I see two twin triodes 12au7 being used. what am i missing here.
  10. doors666

    Starving Student PCB's

    I already have an O2, makes sense to still get this? Does this have tube like sound or more SS like sound?
  11. doors666

    Any New DIY Dac options for a novice DIY'er? $100-$350

    there's a gb going on for subbu dac v3 on diyaudio.
  12. doors666

    headphone recommendation for a friend in 200$

    sorry, didnt notice there's a mega thread for recommendations. added the content there. mods, please delete this thread.
  13. doors666

    ++ FULL-SIZE HEADPHONE RECOMMENDATIONS THREAD++ CLOSED: Please post a thread in the Introductions, Help and Advice forum

    Oops! didnt notice this thread and started another one, newbie mistake. Will post the needs here and ask the mods to delete the other thread.   A friend of mine is looking for headphones in about 200$ budget. He's currently considering senn 558s. Mainly listens to jam bands (dead etc), some...
  14. doors666

    headphone recommendation for a friend in 200$

    A friend of mine is looking for headphones in about 200$ budget. He's currently considering senn 558s. Mainly listens to jam bands (dead etc), some jazz and some classic rock, most of the times live shows though, no mp3s, almost always flacs. headphones need to be forgiving enough to play...
  15. doors666

    beginner headphone tube project to start moving away from low voltage designs?

    I've been pondering over this. I am a newbie going for low voltage tube hp amps for the time being. what are the advantages of going for high voltage tubes over low voltage ones.
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