Do It Yourself

not sure if there is any interest, but ran across these: DODD AUDIO DIY

Anyone interested in a Universal Signal Isolator shield for the Arduino DUE? http://www.dimdim.gr/arduino/universal-signal-isolator-shield-for-the-arduino-due/ Found this while looking up how to add a display to my dac. I'm looking to order some boards so I thought I would see if there is any interest here

I have a spare cable for the Omega 2, which had broken close to an end to the phone, and I would like to make an extension cable with it. I also have a spare Pro bias female connector, which I had taken out of my SRM-727A when adding a normal bias out on it. I was wondering, how difficult would it be to use such connector on the spare cable, to make the extension cable I need? Should I use any particular care (with solder, for example) on it? Will it supposedly sound as good as the Stax 'official' one? Thank you!

Anyone know anything about these? How would these compare to Amb's regs, or even the micro GRLV? Someone asked me about them. I'm normally very leery of the shit that Partsconnexion sells (Bybee? Burson? etc.). https://www.partsconnexion.com/BELLSPX17-85570.html https://www.partsconnexion.com/BELLSPX79-85599.html

Hi everyone one year ago I bought two Aikido 24V and two Max Millet boards, I have assembled them with BJT and MOSFET. Great DIY project, great sound, really. The "valve sound" when I was young.... I like very much the Aikido sound with the LM317 buffer (great idea!!!!), this is my preferred headphone amply, and I like too the Millet diamond buffer stage, so why don't create a new headphone amp with the best of both Aikido and Millet? Et voil

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?

As many of you know, APL is being flaky as ever so I might as well keep my 3910 since it works well for my needs and sounds pretty good. I do have two major problems with it though, first of it is 117V only and the second, it is not silver. The solution for the latter is pretty simple, I just bought a Japanese 3910 for very little money (which are champagne colored) so I'll just move all the trim parts over and gain a replacement drive too boot. That player hasn't arrived yet so I'll tackle it at a later date. As for the issue of 117V, well an outside step down transformer is just a pain so why not try to mount one internally? Since I was ordering some transform…

Hey I've got a seduction phono preamp that's developed a problem. I get a low level: thu, thuk, thuk, thuk sound out of both channels. it's not bad with the stock tubes, but with a pair of amperex bugle boys it interferes with the music. It's a fast rhythmic pulsing that is channel independant (shows up in both). I've tried replacing the caps in the PS and the heater PS since someone on the Bottlehead forum suggested it might be "motorboating" but that didn't work. All voltages check out on the amp except pins 1 and 6 on each tube. Both should measure 70V, but one measures 73 on one tube and the other tube it's 67. Any help would be appreciated. Oh yes, …

Do any DIY experts have any any intel on modding Stax cables to be removable at the earspeaker ala the Stax SR-L700MK2 ? I'm interested because I have a couple of worn out Stax, the cable is fatigued at the strain relief up top and is causing drop outs and static. I've seen youtube vids regarding this fix, but am leery that the connectors used may not be able to safely handle the voltages involved. The connectors are circular four pin mini bayonet style, gold plated pins with what appears to be a black phenolic plastic insulator around them. There is no mention of part numbers used, other than that MrSpeakers sells these connectors. On his website, he …

My P/S caps are 220mFd electrolytics. My unterstanding is that the higher the value, the greater the storage capacity... increasing the amps bass performance. If so, what value should I stop at? I.E. How high is "too high"? Do cap brands really make a sonic difference? My power supply is two 9V cells, with virtual ground between the two 9V batteries.... Similar to the RA1, however the RA1 doesn't use electrolytic capacitors in its power scheme. Are the P/S caps even necessary in the above schematic?

In Netherland there's not much people interested in headphones, but thank god, I've found three persons in my building and I successfully persuaded them to build the 8 EML tubes fully dc coupled DHT amp. They're speaker guys, anyway since their children are too young and the wives want to keep the family quiet, they agreed to try headphones. We will do it toghter, one person alone couldn't afford it. We want to build it, yes, 120% sure

This is something I've been playing with for a while, in short, I can change my K340 from sealed to vented so I have more range for tuning the bass. This picture shows how it's done. Sealed the back with a piece of plastic and taped it in good with electrical tape, but first I put a couple holes in it which I've highlighted with the arrows. How does it work? Well, you can plug one, both, or none of the holes with a small piece of blu-tack, and that'll change how the bass sounds. With the holes open there's more bass but it isn't as tight, you get a bass hump but it doesn't really go any deeper. Close up both holes and the bass gets tight, maybe a bit too tight so i…

cable talk, how do we react when we facing cable?

Sorry to pollute the forum -- does anyone have any Blackgate N 4.7u/50V or 10u/50V caps? I could use either 3 or 4 of the 4.7's (I have one) or 4 of the 10's. I am happy to pay the going rate, or I have lots of DIY stuff to trade (including some new WM8741 based DAC PCBs arriving in a couple of days). Thanks

Wondering what type of plastic Stax uses for the (black) jacks on their amps. Or if anyone knows of a black plastic or material that is machinable and plays nice with high voltage. I don't know what Stax uses, thought it might be bakelite as it is hard and brittle but it fails the "409" test for bakelite and a sliver that I cut from one floats as well (bakelite is heavier than water). You can sometimes identify plastics by the way they burn. Couldn't ignite the (tiny) slivers that I had. Possibly a phenolic smell after heating, might be a lower density resin related to bakelite. DIY jacks are usually made from white teflon (or delrin). Black coloured materials t…

Anyone have CFA3, GRLV, or headphone protector boards available for sale? Thanks!

hi all! I was wondering if anyone here would be willing to turn a wood motor pod for a project I am working on. I have a custom aluminum plate that I'd like to press fit into a simple, wood cylinder that would include a cutout for the motor itself that would run right down the middle. The outside diameter would be 120mm and the height would be just enough to accommodate my Nottingham turntable, so 4-5". If anyone is interested, I can supply detailed drawings for the top plate and we can talk price Thanks!

I'm quite excited about the new updates regarding the Mini? portable amplifier. http://headwize.com/ubb/showpage.php?fnum=3&tid=6936 Specs and technicalities aside (which appear positive), I'm quite surprised by the size of the amplifier. Quite small and cute if you ask me.

I'm about to start fiddling with wires as I build up to making myself some cables (balanced interconnect and a balanced headphone amongst others). 26 awg spc solid core wire electrical insulating tape rather than heatshrink (I found a heatgun a bit expensive for learning) a hand drill for twisting the wire Is there an optimal number of turns per inch to twisted pair and starquad cable when used for balanced headphone based audio ? I am aware that cable capacitance can increase with density of wire present at a point (so less turns might be better) and that the common mode noise rejection will cancel interference only if it affects both wires equally (ergo mo…

Power is obviously higher than dynalo mk2，but But the temperature is high too.

I was wondering if anyone had contacts to wire manufacturers? Thanks, Biggie.

I was looking for sth DC coupled hybrid power amp for desktop speaker with no caps or transformers on either input or output. While searching on google, I wanted to find jfet/tube differential, tube voltage gain, MOSFET/BJT current gain design. Then I find this. http://tavishdesign.com/pages/direct-coupled-tube-headphone-amp any opinion? Though there's a cap on the input. Any other SE or balanced configuration will be welcome.

The part tested ok and seems to a 15 volt reg mc 7915ctg mc 7815ctg

AKM post a pic, but still no details...

only talking about non-ESD amps here (aka common amps), if the amp has no negative feedback, (using n-fb could achieve pretty pretty low output z, 0.0x ohm i assume), but how about those none-fb ones? open loop is a hard subject