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  1. wap32

    Fostex HP-A3 & HP-A7

    So I stumbled upon these today, didn't find any threads about them so I thought I'd start one. HP-A3 (~400$/~297€) is bus powered, and has 24bit/96kHz USB and optical inputs, along with a head-amp, uses a 32-bit AKM AK4392 DAC. HP-A7 (~828/~602€) has 2x optical, coax(192kHz), USB and...
  2. wap32

    Ground loops and breadboards

    So...I decided to test a project amp of mine on a breadboard. I'm using a toroid in a center tapped configuration with the center tap connected to safety ground (earth). Well, this worked fine with my ipod, but as soon as I connected it to something into the mains I got terrible hum and...
  3. wap32

    AD843 and DC offset

    I'm wasn't sure this would be worth creating a new thread, but I didn't want to hijack other threads. I was simulating an amplifier circuit in NI MultiSim (basically an opamp gain stage with class A biasing followed by a mosfet buffer) and while testing it with an AD843 I noticed I was...
  4. wap32

    Voltage regulator advice

    I'm building a simple amp with an opamp gain stage followed by a szekeres ve mosfet buffer and I was hoping to power it using some old transformers I have lying arround. They're iron core, single primary 230VAC, single secondary 24VAC, 50VA. Using both in a center-tapped configuration, after...
  5. wap32

    mini3 + alien dac question

    So I'm thinking about building a mini3 + alien dac combo, both powered by the same battery. Since I'm kind of a newbie when it comes to electronics I'm having some doubts. Since the mini3 uses a virtual ground I would build the alien dac with the buf634u and connect the mini3's gnd, v+ and...
  6. wap32

    Replacement for Shure E2c's

    Recently my E2c's cable has broken and since Shure won't fix them I'm shamelessly using that as an excuse to upgrade I bought the Senns CX-300 hoping they would suffice (I'd read they were almost as good as the E2c's, and they were cheap) but they sucked. Less detail, muddy sound, insane...
  7. wap32

    HD 595 or ATH A900? Where to get them?

    I'm thinking about buying a new set of headphones to replace my HD 212Pros and after doing some research I've come up with the HD 595 and the ATH A900. I was interested in knowing, in terms of sound quality, which one is better. I do prefer closed headphones, but if the difference (in sound...
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