I wanted to share my latest DIY project as it has to do with measurement of audio instruments and I though it could be of interest to other audio DIY hobbyists. I have also posted about it on the EEVblog forum which more electronics focused than audio, therefore, I'm not sure its the same...

Hi All, I've been using my AMB gamma2 for a few years now, and finally decided I want to upgrade. I don't need it to have any other functions other than the DAC (I have a dedicated amplifier), but I don't really mind having an extra headphone out either. I've been out of the game for some time...

Hello everyone,   I have this idea sitting in the back of my head for a long time, and didn't follow up mainly due to the lack of time as I'm preoccupied with other projects (some of which are related to stereo/headphones as well). Eventually I've decided to share it with this forum and see...

Intro: since this post is quite long, I'd like to sum this up in a sentence. This post shows an issue with the operation of the well known capacitance multiplier under appreciable load condition, with some background and simulation result as well as measured data. A solution to the problem is...

<Edit> As wakibaki has suggested, I'll sum the main few points so it won't get lost in this long post. The goal of the post is to share a design of a simple voltage regulator I've designed, and go over a few of the steps along the way. The final design presented in this post is a simple discrete...

Hi Guys,   A friend of mine wants to try building he's own IEM's. One of the options is taking apart a TF10 for the drivers (a used pair of these costs less than the drivers from Mouser).   The only question is if the drivers can be salvaged or are they held using epoxy or something of...

Hi Guys,   I've bought a used Hakko 470 yesterday. It wasn't in the best shape, but the price was very low (about 110$), and it was a local guy so no shipping/tax to worry about. The heater works, and the pump works. However, it needs a new nozzle, and preferably a new heater as well. While...

Hi Guys,   I've picked this Denon amp today, and I'm trying to get it up and runing. I've tested it and all of the voltages in the PS look good. I've entered a 1KHz ssine wave into the amp, and with my Rigol scope was able to follow iit all the way to the output of the power BJT's. However...

Hello everyone, I've been into DIY for a while now, and I feel like I could use a scope for making measurements of some of the things I build, troubleshooting others, and also for the fun and learning experience. I'm an EE student, and have had a few encounters with scopes (Agilent 54621A...

Hi Guys, I'm in need for a device that will connect to my laptop, and will be able to encode DDL to connect to my HT. I first looked at the Sondigo Callisto but its not available anymore (and I'm not sure if it supports Win7). I than almost purchased the Asus Xonar U1, but now I hear...

Hi Guys, I need a nice sound card for my laptop, I dont really mind if its USB or something else as long as it fits the laptop. It must have Dolby Digital Live, and have a nice analog 2-ch output for my headphones. Are there any other options? Any comments on the U1?

Hi Guys, I need a pair of AD8610/20 for my Pimeta, and since I'm not from the states I'm looking for a store with good shipping price as well. I've looked on eBay and found a pair for 21$ shipped, which seems a bit too low (especially since the same seller sells 10 packs for less the 60$)...

Hi Guys, I'm about to finish my Sigma11 (everything ready, including the case) just need to make sure the heat-sinks aren't live so they wont short to the case. I went to a local store and all they had was these pads: I was wondering if anyone has ever used these. I haven't seen these...

Hi Guys, I've purchased a new laptop to replace my desktop (as I'm a student I want to be able to take my pc with me). This means I now cant use my Asus D2, and need something new. Since my HT-receiver has now HDMI ports, and I dont want to spend a lot of money upgrading it (prices in...

Hi guys, I'm about to finish the sigma11, and will soon build the Pimeta amp, both will sit inside Hammond case (1455 series). Each one will have its own case. I want to place a DC power connector on the chasis, but since its all metal, I need an insulated connector (that's panel mount). I...

Hi Guys, So I've got all of the parts (just waiting for the MOSFET's), and I've started planing the case (it'll be the 1455N2201, since the transformer is the Antek Inc which is 3.0” Diameter x 1.5” High). I've ordered a power connector + switch a few weeks ago, and was planing where I'll put...

Hi Guys, I'm building a Pimeta + GrubDAC combo, and I want to be able to choose between the DAC and the RCA input. I want a rotary switch with 2-3 inputs (I dont really care if there's more, just have no need for it, I'll leave the disconnected). I tried looking at mouser's website, and the...

I think I'll get me one of these, as the recent few projects involved quite a bit of SMD work (and a few more projects are on the way), and the small loupe I have at the moment is just not enough. I've started checking out the selection in some local stores, and I see there are quite a few...

Hi Guys, Last week I've built 2 more cMoy's. I dont really have a use for them, just had some spare time, and wanted to build something, so as always a couple of pics: (I know the V- isn't connected on the right picture, dont worry, its been fixed already, and of course cleaned the flux)...

Hi Guys, My uncle from the states is coming for a visit and I want to use the opportunity and order the Fluke 289/FVF. I was wondering which retailer is considered the best? At the moment looks like Tequipment.NET the lowest prices for test equipment are the best since they aren't...

Hi Guys, I have a DV336se at the moment (isn't mine, I have it for modding). I've made a couple of mods to it (1uF capacitors in the PS, added 0.22uFx2 capacitors at the output, and a 220uF cathode bypass capacitor). It has worked for 6 hours straight after mods, and while it works and sounds...

Hi Guys, After owning a few high-end cans like the K1000, HE60, and a few other interesting phones. And after disliking all of the current AKG/Senn/Beyer line and most of the other cans I've tried, I've finally found a headphone I like for a reasonable price which is the AD900. I was...

Hi Guys, Been a long time since I've opened up a thread here. Anyway, let start off with a little introduction. Over the last few years since joining HF I've had the opportunity to own and to audition many headphones. As time went by I found myself unable to listen to all these...

Hi Guys, After going through a bunch of DMM's (the current going for about 60$ or so) I've decided I now have the need for a better unit which will be accurate, reliable, and will meet my needs in the next few years. I dont minding paying more, just need something that will justify it (just...

Hi Guys, I'm having a bit of a hard time understanding one of circuits in the book. from what I can understand, Q1 is used to set the Vb of Q2 a diode drop above ground (biasing it). Is there another use for it? The quiescent current at no output is 3.75A (30V across Re, meaning 112.5W is...