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  1. morsel

    DIY A/V RCA Compression Connector Cables

    You can make cheap audiophile quality cables comparable to expensive designer cables. F/BNC/RCA compression connectors assemble quickly and easily with common varieties of coaxial cable and grip with 360° high strength retention, resulting in more reliable and robust connections than solder...
  2. morsel

    new portable amp project

    new portable amp project
  3. morsel

    lost email, please resend

    Email sent from a Head-Fi user over the weekend was lost due to a freak accident. Whoever you are, please resend your message. Thanks.
  4. morsel

    lost email, please resend

    Email sent from a Head-Fi user over the weekend was lost due to a freak accident. Whoever you are, please resend your message. Thanks.
  5. morsel

    ExpressPCB v5.1.0 supports copper fills and custom pads

    ExpressPCB v5.1.0 supports copper fills and custom pads. This may keep me from ever switching to "professional" layout software. I'll be out of town this week, but will try it out on my laptop and report back asap.
  6. morsel

    AD8610 on BrownDog adapter

    BrownDog is now offering AD8610 opamps mounted on BrownDog adapters for $11.95. These are also available from AMB Audio Shop or Tangent's Audio Parts Shop for only $10.
  7. morsel

    PPA v2 construction discussion

    Talk about building PPA v2 here. Tangent's PPA v2 site Morsel's PPA v2 site
  8. morsel

    bass boost shelving filter equations

    Calling all hardcore math/ee geeks! What are the true equations for gain and 3dB points of a bass boost shelving filter, as described below? The Audio EQ Cookbook may provide some clues, but math is not my forté. The bass boost circuit is a 6dB/octave low pass shelving filter. Bass response...
  9. morsel

    PPA v2 Project Announcement

    PPA v2 Project Announcement (Trumpet Fanfare) Team PPA present a new community service project and invite your participation. PPA v2 replaces the Intersil HA3-5002 buffers used in PPA v1.1 with a version of PPL's discrete diamond buffer. There is no ETA on boards. Team PPA is...
  10. morsel

    M³ Project Announcement

    M³ Project Announcement Morsel and AMB present a new community service project and invite your participation. M³ is a 3 channel MOSFET output headphone amplifier inspired by the PPA and SDS Labs amps. There is no ETA on boards. Pronunciation M³ is pronounced em cubed. The 3 in M³ is...
  11. morsel

    OPA1632

    OPA1632 Fully Differential I/O Audio Amplifier opa1632.pdf Iq 17mA Io 85mA BW 180MHz Slew Rate 50V/µs Noise 1.3nV/sqrtHz Supply Range ±2.5V to ±16V Fully differential balanced output Has anyone played with these yet?
  12. morsel

    linear .vs. log .vs. shunted pot

    I created these graphs a couple of years ago but never posted them. blue = linear 100K red = log 100K green = linear 100K shunted with 5K (It was much worse with a 15K shunt.) Now look at it graphed on a log scale. Shunted pots present a variable impedance to the source in...
  13. morsel

    stepped attenuator rotary switch mechanisms

    I would like to hear comparisons of stepped attenuator rotary switch mechanisms, specifically with regards to the feel, how easily and quietly they rotate, whether they generate any electrical noise, mechanical noise, are they make before break, etc. These are the rotary switch mechanism and...
  14. morsel

    PPA last call

    PPA layout v0033 and schematic v0030 is our final release candidate. The deadline for posting comments, suggestions, and requests is midnight Sunday, July 20, 2003. After any last issues are addressed, a final prototype will be ordered and validated, followed by a production run of boards...
  15. morsel

    PPA Power Supply

    We are working on a capacitance multiplier power supply for the PPA. Here are a couple of links for reference: http://sound.westhost.com/project15.htm http://www.gmweb.btinternet.co.uk/jlhcapmult.htm There are 3 versions: single, dual, and single with dual darlingtons. Two current sources...
  16. morsel

    PPA Project Announcement

    The PPA (PPL's Portable Amplifier) is a new headphone amplifier that PPL, Morsel, and Tangent have been working on since last fall. Over the past few years, PPL created a series of pocket headphone amplifiers using opamps and open loop buffers which were the inspiration for Apheared's #42 and...
  17. morsel

    ExpressPCB v3.2 is available

    ExpressPCB Download Page
  18. morsel

    Neutrik combo jacks do not lock

    Neutrik NCJ series combo jacks do not lock 1/4" headphone jacks, the silver tab only locks XLR connectors. Neutrik NJ3 series red tab locking 1/4" jacks do work properly. Thanks to Kurt for discovering this.
  19. morsel

    Tangent's dual DIP opamp adapter is now available from Browndog

    http://brndog.com/SingletoDualDIP.html
  20. morsel

    ExpressPCB v3.1 is available

    ExpressPCB Download Page
  21. morsel

    Nichia NSPW515BS 5mm diffused white LEDs

    Behold, the Nichia NSPW515BS 5mm diffused white LED. All the other white LEDs I have seen are more suitable for flashlights than panel indicators. This LED is beautifully diffuse, with 70° dispersion and a milky translucent package. It is amazingly bright and works well with low current. I...
  22. morsel

    single so8 to dual dip opamp adapter available from BrownDog

    http://www.brndog.com/SingletoDual.html
  23. morsel

    indexing Amarok by Mike Oldfield

    Amarok by Mike Oldfield has been one of my favorite albums since it came out in 1990. This recording is stunningly dynamic and creative with delicious stereo imaging, however, it is a single one hour long track. In order to jump to favorite sections and skip strident sections more easily, I...
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