I have built the following power supply for a microphone preamp, and during testing I discovered that it makes an audible 120Hz noise. The noise appears to be coming from capacitors C301 and C302 that generate the high voltage for phantom power, which makes sense conceptually, but I'm still not...

My girlfriend has asked me to help her select a new pair of cans. She's mostly concerned about using them for sound engineering as she's a film student and taking several sound courses this semester, so clarity and neutral response are the most important criteria. She'd also like to use them for...

I feel like an idiot for posting this, but I honestly for the life of my can't make sense of it. I can simulate it and know that it does what I want, but I need to derive a formula, and I can't figure the math out. We're talking about a really trivial voltage divider here, designed to measure...

Anyone know where to find a large aluminum knob without a position indicator? I'm using a digital volume control on a couple amps and the indicator makes no sense, but I can't find any that omit it. All I really want is a slightly beveled cylindrical chunk of aluminum with a 6mm hole in the...

I know I'm not usually too active in these parts; my haunt is the DIY forums. That said, I'm hoping someone can lend a hand to a fellow Head-Fier. My girlfriend and I are really excited that Andrew Bird is playing this summer at Woodland Park Zoo, but tickets are no longer available online...

So here I go again with the ever-more-difficult-and-more-expensive projects. This time I wanted to try out a DAC that doesn't get much exposure around here since you really need a microcontroller to set it up properly - the AD1955. On paper, it's very competitive with PCM1794 and I'd like to...

After receiving a request some time ago from theAnonymous1 over at that other board to write simple firmware to control a PGA2320 (or PGA2310), I found that I needed prototype hardware to test my code on. So I present to the community my board & schematic for critique. It seems like a simple...

Are there any other online shops out there that sell similar products? I've just been informed that my order this weekend can't be filled because they don't want to deal with the export restrictions to Canada. Or any B&M stores in the Vancouver area that sell nice fasteners?

Well, someone just had to make the suggestion that I try this chip out, actually as part of my PGA2311 preamp project. I've got to hear it first before I commit to the boards for the other project, so I've done up a little board to try it out. Could potentially make a decent portable amp, but...

So I sampled a few of these interesting BB ICs ages ago with the intention of building one into my CK2III build, but that never happened so I decided to get a little more ambitious. I'm now getting my feet soaked designing a full-on preamp around the chip, complete with digital source selection...

Alright so I'm trying to build a decent DAC/amp in as small a package as possible that I can bring to work. I think I've got most of it worked out, but I'm going to solicit ideas to solve a couple problems and answer a couple questions. The plan right now is to use the DCP02 series of...

This is my first post here, I've been lurking a while, learning the vagaries of audiophilia and DIY audio gear. I've got parts for a CMoy in the mail, as well as a mintyBoost DC-DC boost converter to hopefully last me the 21 hours plus 10 hour stopover flight I'll be taking to Australia in...