Do It Yourself

The left earcup snapped off. You'll see from the pics that there is a sort of ring or collar made of black plastic around a brass/metal part. That black plastic piece snapped. I'm not sure how modular these things are, but it looks like some Krazy Glue might do the trick. I welcome your suggestions.

So what are you currently working on? Researching for your next wallet buster? I just ordered all the parts for a SOHA, and I am comtemplating a M^3.

Man, I forgot to add 4 1000uF/50V Panasonic FM capacitors (P12393-ND) to my last Digikey order... anyone happen to have some on hand, or about to place an order and wouldn't mind shoving 4 parts into an envelope and sending them my way?

Edit: Group buy on Song Huei pots is closed. Please see the this post for the current TKD group buy The latest version of the Dynalo SS Mini board uses a 21 mm alpha potentiometer. Song Huei potentiometers are identical in every way and and inquiry with them has led to the possibility of a small order limited to ~100 potentiometers. Otherwise we would need a minimum order of 1000. Due to the low number of available potentiometers, whoever is ordering a Dynalo Mini SS PCB will get first priority and extra potentiometers will be limited. Due to the reported failure rate of these potentiometers, I will also accept returns to send back to Song Huei in order to get…

so tyll has been going crazy over the bakoon for planars. well there are a lot of things i don't like about that amp, especially the battery power and distortion. so here is something much better, tested last night at .06%thd, no feedback, output impedance 100k which is solely due to the servo... http://gilmore.chem.northwestern.edu/currentsourceamp2.pdf http://gilmore.chem.northwestern.edu/currentsourceamp2.zip also testing curved traces

So a couple of people have asked for a discussion of the design elements of the T2, and any observations and improvements that are possible. So as not to polute the T2 build thread, which is already seriously poluted, the discussion of T2 design elements, including kerry's dynamic amp should go here. doug wadsworth (wadia) should be stopping by soon Actually, a moderator change the thread title to discussion of the T2, and other circuitry as we see fit including but not limited to my other designs and shunt regulators and stuff like that etc...

Got a regular 24v psu (no minus voltage), 100k vol pot and a small case. Best amp to build?

This is the story of a very sick little Firstwatt F5 that needs some TLC. This is hopefully the last chapter in a rather sad story involving our Scottish Lord of Drink. Dough bought it from some scammer on DIYAudio which not only botched every facotr of building the amp but couldn't even be bothered to ship it properly. To fast forward a bit I had expressed my intention to build an F5 here and Doug offered to send me this amp to do with as I pleased. I took this a good chance to tinker with an F5 and help a friend out since this amp will be returned to Scotland in fully working condition later on. Now onto what awaited me in that 13kg box from Scotland. Parts …

There are a few of us building this amp, and at least two of us that have taken this on as a first project, so I'm thinking a thread is in order, since I'm sure that there will be some discussion and questions.

Maybe keeping such things in one place will prove helpful? Maybe not. Anyway, to get the ball rolling, does anyone have a technique for removing a snapped off 4-40 tap from extruded aluminum side rails? Maybe the sort of kit one uses for removing stripped screws would work, but there is no head, essentially. Any other thoughts?

Hello All... Since there were a bunch of requests for more GRLV boards I'll do another round. I've also added the boards listed below that are in demand. Also, as a side note if you're looking for boards from my last GB I have one set of Dynahi boards, four or five Dynalo Mini, and a few volume pot boards left. Send me a message if you need any of those. Sign up Sheet: https://docs.google.com/spreadsheets/d/1Z1L3MQuuY4ZTUyPQb1qBmVJp8MtC7qEzBUui3z5dFrQ/edit?usp=sharing Balanced\Unbalanced board (both smt and through hole) Through Hole http://gilmore.chem.northwestern.edu/boards/diffinput3.zip SMT http://gilmore.chem.northwestern.edu/boar…

So my mostly completed Beta 22 arrives tomorrow and I'm taking the day off to see if I can get her finished. What does that mean to you lot I hear you say? Funny you should ask.. I'll need all hands on deck guiding me through the precarious operation to bring life to my baby. I'm still not sure what's connected and what's not or how much work is left to do so I'll need some guidance on how not to blow it up Stay tuned... tomorrow will bring pics and questions

Twisted Pear Audio Looks like a new round of boards will be available for purchase this weekend. Get 'em now while you can.

This concept has interested me for a while now given just how simple the amp could be made. Just two tubes per channel and then a phase splitting output transformer makes for a stark contrast to something like the T2. Now whether this simplicity is better or worse isn't the issue for me, I just want something different. I figured it was time to get the concept of these amps outside of the random thread on HF and PM's. I've been talking to Frank Cooter about this and given how happy he is with his D3a/KT88 amp I'm going to try something similar. I'm always a fan of using what I have (hence my Exstata is a bit different from all the others) so soemthing like the …

So it turns out that the lme49830 is pretty much a dynafet on a chip, with diamond buffers driving the fets. SO... combine with the semelab-tt lateral audio mosfets, and the result is something super sweet, and easy to build, about $50 in parts per channel. Combine 4 channels with my balanced preamp, and have one serious kickass thing guaranteed to drive anything, he6's and k1000's included. At about 2 orders of magnitude less distortion than that other thing. And more than 10 times the available output current. at... 20hz to 20khz... .1mw .05% thd (most of which is noise) 1mw .01% thd 100mw .005% thd 1w .0003% thd many watts <.0001% thd …

I am not sure if these will live up to the title but it's the name of the speakers so I figured I would go with it. This will just be a down and dirty diary of the cabinet build for my soon to arrive Audio Nirvana Super 10 cast basket drivers. The box is about as simple as it gets. Rectangle with a couple holes cut in it for ports and mounting the drivers. I will be using primarily 3/4" (actually 11/16") Baltic birch and a bit of MDF. Here is all the wood cut up and ready for glue. All clamped up. As you can see I have some cheap ass Harbor Freight clamps that bow under the pressure. But they cost $1.50 so I can't complain.

"Description (Gerbers) copper/pcb thicknes": Everything is one channel, and two will be needed for stereo. As for the KGSShv PSU, only the Single Right Skinny is offered: containing one High Voltage rail and a BIAS supply. Those who needs a full supply will need two of those + the Golden Reference Low Voltage. Überamp (Uber1 + Uber2) 4oz/2mm Unbal2bal (Uber3) 3oz/1.6mm Golden Reference Low Voltage (GoldenReference6) 3oz/1.6mm Transconductance Amp (CurrentSourceAmp2) 1.6mm/3oz KGSShv PSU (kgsshvpssicfetsinglenewright), 1.6mm/3oz KGSShv Carbon Amp (Carbonv6), 1.6mm/3oz Grounded Grid (.........) , 1.6mm/3oz (as requested by JoeHpj …

It occurred to me a while back that my rig has gotten to a point that in terms of headphone amps it'll be pretty damn hard to beat what I have and that continuing to build more headphone amps is probably pretty silly. Where does that leave me? cue JBLoudG20 and Reks Speakers! Now I was talking with Pete the other day about basic speaker amp projects, specifically the design set forward in the boozhound labs howto pages. I had been looking at that project for a long time and had gathered about half the parts that I needed to complete the build but I was thinking of making some changes (different rectifier and input tubes) and solicited Pete's advice to make sure I did…

I published a modification for the Stax SRM-T1/T1S/006 in AudioXpress July 2017, which is just out. The modification adds 5.1 kilohm output safety resistors and cascoded constant current output loads, which with their heatsink fits the space vacated by the plate resistors - see photo. Spritzer did something similar a few years ago with an SRM-007, adding constant current loads, but he also changed to 6S4A outputs. Unlike plate resistors, constant current loads burn up practically no signal current, so while the stock amp burns up 9.2 mA signal current in the plate and feedback resistors at its specified 300 VRMS maximum output, the modified amplifier only …

Where to buy a stax 5 pin female plug?

Someone, who will remain unnamed here, got me interested in building a Megatron I got quotes back from the fab houses. If we can get 10 sets we can get the cost per board down to just under $40 USD (plus shipping from me to the participant). The PCB is 228mm x 228mm and will be 2mm thick with 4oz copper. I did some research and the only obsolete/hard-to-get part is the 4 2SA1968 which Kevin confirmed can be replace with KSA1156 mounted backwards. The board also uses 2 2SC1815 or MPSW06. I have a stack of the 2SC1815 so I am happy to supply them to the GB participants that need them (no cost). Please respond here if you are interested. Thanks!

Another round of Carbon etc. state your interest here When ever there are enough boards for ordering participants will be asked to pay estimated price. Shipping will be added whenever the cost is known. Boards from PCBNet. Distribution via @mwl168 in US/Canada, and from Denmark, Europe for the remainder. /S

PM me for Paypal account details Hello all I have discussed the idea of honouring Alex Cavalli aka runeight on the DIY forum with a few members and there seems to be general consensus that this is a just cause. Who is Alex Cavalli? He is many things; but for many of us he is an inovator of ingenious design and he has given selflessly of himself for the past decade. Here is a link to his website where you can see a few of his designs that have come to fruition and many have the pleasure of owning. Why now? Well simply put, in a recent conversation I had with him it became clear that he needed better headphones and I got to thinking that this would be one…

I didn't find anything in search, which was surprising. Maybe I suck at searching. Anyway, a couple q's for those that own one or more: 1) How do vintage ones hold up? How often do they need recalibration? I'm not talking about serious vintage, with 50 tubes inside, but 1970s to 1980s solid state stuff. 2) Specific brands to look for/avoid? 3) What's the cheapest decent digital oscilloscope that can be hooked up to a PC? This or something close to it is what I'm used to using in the labs (yes I know it's a couple thousand... used): Digital Phosphor Oscilloscopes: TDS3000C Series > Data Sheets : Tektronix Specifically TDS3012B. 4) How useful/not useful has i…

Lil knight among others have asked for an updated dynahi board. Here it is. http://gilmore.chem.northwestern.edu/dynahi8.zip changes, remove 2sk389,2sj109, add lsk389,lsj109 2sk170,2sj74 you can use opa445 instead of op27 and then you don't need the 7815 and 7915. 2sa1349,2sc3381 can be replaced with the single versions. I need to check this a few more times. unbalanced input, balanced output version coming soon.