Do It Yourself

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Hello everyone, I had started to post my attempts to build a modified KSA-5 klone over in the "krell ksa5 klone" thread, when I realized that I should create an own topic because my build would not be an exact clone... so this here is then exactly that. I will copy the previous posts here and delete there! Cheers, Alex. Hey folks, here is a first view on my take of this amplifier. I want to be able to attach the power transistors on one side via an L-bracket to a single heat sink. The power distribution sequence layout was kept in place but of course I had to do a little re-arranging. The original input stage is more or less unchanged. Both t…

Hello! I am building a set of DIY headphones in a headphone shell that has a 50mm mount. I could also add an adapter to accommodate a 40mm driver. I am looking for a nice driver for this shell. I tried two different drivers from Aliexpress and neither were very good. Any suggestions?

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

Hi All... Anyone up for a group buy of IXCP10M90S ? This place below seems to have 146 of them and is in Florida. I know I need them for a bunch of projects and could wait but I'm thinking this might be good for everyone. Has anyone ordered from this place before? https://store.nacsemi.com/Products/Detail?part=IXCP10M90S&stock=XSJMZ0000019254&Mfr=IXYS&auth=n&utm_campaign=listing&utm_source=findchips&utm_medium=aggregator&utm_content=textlink&instock=y I'll run it like my others in the past. I'd say 7-10 people is all we need. I'm in for 30

I was going to name it 'Double the Carbon, double the voltage, double the fun', but I'm afraid that would be too wordy. Ever since I measured the output swing capability of the Carbon, I wanted to see if it can drive my ESL speakers. To do that, I'd need a beefed-up version that can output at least 1kVrms before clipping. That's 1414V peak, out of a ±750V to ±800V PSU. To simply scale up the Carbon amp and the GRHV PSU without major changes to the PCBs, a few hurdles would have to be overcome. First is the 900-V rated 10M90s in the cascode CCS that bottom out with ±450V PSU. When I was browsing the high voltage FETs at Mouser, I found the UnitedSiC UF3N170400B. …

Hi All, I have been going cross-eyed of late poring through the various threads for the projects required to get a complete amp together and hoping to get a few pointers. I was originally looking at building a Dynalo based amp but after some feedback from Pars and others I had a look at the CFA2/3 boards and think I have decided to go with a CFA3 based build. I am going to build a balanced in / balanced out setup in dual mono so for the amp boards, it will be 2 x CFA3 (based on 89753654_cfp3rssfixedssw-CADCAM.zip) - I am pretty comfortable that this seems to be the most recent version of the CFA3 board. Where things seem to get a bit interesting is the…

hey, i wanted to build a kgsshv as a fun project but since i am a beginner i figured out i would be better off starting with something more simple. so, how do i start? also which tools i need for the measurements and building? (sorry if this post is redundent)

Like i don't have enough projects going on at once I'm tired of waiting for someone to release boards that do this right. so here is mine in progress http://gilmore.chem.northwestern.edu/attenuator2.jpg Because i don't like any standing power on the relays, and i don't like the resistive drive either, this had to be a bit bigger. board is 3.4 x 10 inches. stereo single board, or two for balanced.

Hi all, I've been more and more interested in building my own amp after having built a relatively simple Elekit amp. I've been reading through the KGSSHV and KGSSHV Carbon build threads and I think I've found the google drives for the schematics and various documents, but it's still a bit confusing where to begin, and I'm not entirely sure I should jump right into trying to build a KGSSHV Carbon. I'm also unclear where one sources the PCBs for any of those builds - seems like various members hold extras and there are some floating around on eBay of dubious origin. Anyway, I'm not exactly certain what build would be good to start out with, or what the differences are …

I'm having some of the teflon Stax jacks w/ the gold plated pins machined. I should have them in 4-6 weeks. I don't have the final price yet because I don't know what it will cost to have the pins assembled. But it shouldnt be more (probably will be less) than the jacks have previously been sold for and it will be excellent machining quality. Edit: August 3, 2012 All connectors from this group buy have been shipped out. If you're reading this late, I've listed more connectors on eBay. Find them at the below links 1 connector - Custom Teflon Chassis Jack for Stax Headphones from HeadAmp 2 connectors - 2 pcs - Custom Teflon Chassis Jack for Stax Headphones fr…

This is a very niche topic so if you are not planning to buy or write programs for the Keithley 2015 or 2016 thd or p multi-meters then this post will probably not be interesting to you - especially given their skyrocketing prices on ebay and their age. If you are planning to buy one because it has audio analysis built in then there are a number of limitations and issues you should be aware of before deciding to buy. Some of these limitations effect the accuracy and validity of its calculations and are not documented in the manual, some of the limitations effect usability and some effect it programmatically if you access it through gpib or rs232. If you look on the i…

Hi All... I was cleaning up and found a pair of Electraprint OPT that I had wound for headphone impedance. I've attached the values. I got these for a build of tubelab's TSE that has now changed to a TSE II. My plan was to use 45 tubes for the output, that would give me 1-2 watts. The headphones I use are HE-560 and HE-6 SE. I have HD-650 and Beyer DT-770 (250 Ohm) as well. My thinking was to start with the 32 ohm tap and connect them directly to the headphones. I don't want to fry the headphones or blow my ear drum if something goes wrong so I'm looking for a sanity check. Should I build it for headphones and use these OPT's or abandon them and get a new set …

Anyone ever try something like this? https://audioxpress.com/files/attachment/2685 I wanted to see if I could find something passive that would take an unbalanced signal from a preamp and convert it o a balanced output. Is this worth trying? Or would I damage the balanced amp?

so sorenb really wanted this, so here it is http://gilmore.chem.northwestern.edu/cfaelectrostat.pdf the outputs are 300v darlington transistors just need to find a suitable npn match for the stn9360, and this can be done all surface mount tiny, fully complementary, fully dc coupled, decent input impedance (none of this 75 ohm nonsense) push pull output... edit: PBHV2160ZX looks great for the npn. so you can add one more set of outputs and run up to 500v power supplies balanced input only, and you need 4 of them

Cases and heatsinks are a problem for DIY builds. Front panels of thick alloy need machining and tapping as do heatsinks. These items are hard to get machined or the sizes the builder wants are not available. I devised a way of making cases, which eliminated these problems and made for easier case design, lower costs and quicker builds. Cases Made from sheet aluminium alloy of preferably 3mm so only single sheet of material needed. I get the parts laser cut by a company which will also supply the material. The case parts need holes to be countersunk where necessary and are then taken for surface finishing, (bead blasting and anodising in my cas…

I know some of the newer and cheaper Chinese digital scopes are all the rage (Keysight, etc.) I am toying with buying a refurbed Tek 2465A, completely working, for a decent price. I know these have a proprietary IC in them, that if it fails, turns these into a doorstop (though I seem to recall this IC being available now...). Good idea or bad? For some reason, I've always wanted one of these... Flail away.

ujamerstand had his university make up some of my version of the stax jacks, maybe he is willing to sell a few. I have 3 of the 6 pin teflon versions that i make left, i'm not going to make any more jacks this year due to lack of time. You could always plug the center pin with an appropriate teflon rod if you wish. Someone needs to organize a group buy and find someone in china to make a large batch of them, with REAL teflon.

I want to make a couple sets using different coax cable available on the net. I want to use solder connectors not compression. I'm looking for something flexible. I've ordered Belden GS-4 and some 26 AWG shielded silver plated from navships. Anybody used Belden 1505F?

So I was thinking of building a linear psu for a new PC. I came across this kit on ebay https://www.ebay.com/itm/LPS200-Linear-Power-supply-kit-board-LPS-DC5V-9V-12V-15V-19V-24V-28V-L164-5/111964387845?hash=item1a1198fa05:m:m3fiLyO2CiBO8ZWg77rtjeQ Anyone ever use something like this kit? The Teradak products are really cool but pricey

I'll soon have the need to switch between two different sources and amps and I'm two projects behind even starting my preamp. I want to put together a 2 in 2 out switch. If I use 4P2T switches how should I manage the shield (pin 1)? Or should I use 3P2T2D and not worry? I'm just trying to see if I can get away with 1 deck instead of two?

I have been using https://drive.google.com/drive/folders/0B_iJFfZStuVhSE5nOHBVdTByR1k to access the stax gerber files for sometime but when i tried to today the folder shows up for literally a second in my web browser and then automatically redirects to the google drive trash folder and the web page freezes up with 100% cpu usage for the thread. I can access the schematics and spec sheets google drive folder without issue. I get the same behaviour with both google chrome and firefox. i don't know who to pm directly about the google drive issue so im making this general post in the hopes someone could investigate fix the issue. regards James

The end of a headphone plug broke off in one of my headphone amps that has a locking Neutrik 1/4" headphone jack. I tried the straw trick, and even the screw trick (gently), all to no avail. Considering the glue/heat trick. Am I fucked (and not in a good way), or is there another technique I should consider trying to get the piece out? Any inputs are appreciated. TIA.

and about time... I’ve been keenly anticipating this . Here’s a link for those that are interested or have missed the news; http://www.amb.org/forum/gamma3-high-resolution-dac-development-t2656.html

My parents have an old pair of B&W 802 Series 80 speakers. I've read that these are still considered pretty decent, but I'm concerned about the condition these are in. I'd like to replace parts like the binding posts and maybe parts of the crossovers. How difficult is this type of thing? Could an advanced beginner DIYer do it? The speakers look like this (these aren't the actual speakers):