Do It Yourself

I managed to pick up a pair of vintage RS-1 (wooden box, brown leather headband, no serial number). However there's no sound out coming out of the right driver. I'm able to unscrew the 1/4 plug and the wires seem okay. Looking into the grill, again the wires seem fine. I'll check the wires against ground with a multimeter when I get home. However, in case worse comes to worse, is there a knack to getting access to the drivers? I've read about sharp screwdrivers, hot water and hair dryer and even spoons ( http://www.headwize.com/projects/showfile.php?file=grado_prj.htm ) though it seems to have been done mostly on plastic or metal-bodied Grados and not wooden o…

I know I've seen it here before, but couldn't find it with a couple of searches. Someone told me to avoid the auto center punches at harbor freight and get one from ebay. I took a look on ebay, and see a number of $4.95 ones, plus some Starrett's that are going to go over $10 or $15. Any recommendations? Thanks, Chris

so due to a comment i made over there, someone wanted to know if i had the eddie current dht filament schematic. here it is. eddiecurrentfilament.PDF

Just a head's up: Fry's has the Hakko 936 in their weekend advert (at least in the Atlanta area) for $50.00. (Can someone please change the title to Hakko 936. Thanks)

Well I traded for a pair of ALO jenna cable rewired 701s and of course the left channel is cutting out on me at the earcup. I have a 4 conductor extension that highflyin9 did for me a while back that is totally transparent to me so I thought I would use that cable to rewire these. Ken did a second entry so I am all set up to attempt to wire them balanced but I can't seem to be able to get into the earcup has anyone done these yet. I would stick with the jenna wire but it is all of 5 feet and I need a min of 10ft any help would be appreciated

I am looking for a nice metal enclosure for a summer tube amp project. The requirements: Size: Approx 12 X 12 X 3. This is a bit flexible, and it can be oddlong as well. Material: Metal Color: I would prefer black Cost: I'd like to keep it about $50-$75. more toward the low end, though.

Someone has emailed me looking for someone to build a regulated 12v power supply that will work in france, along with the cable to make an apogee AD500 work from it. I can provide contact information, etc.

How crazy lazy would it be for me to buy 3 of these and slap them into an enclosure, with a single big ass toroid transformer? It would be an 6 channel amp, I'd probably not use the 6th channel, as my speaker set up is 5.1 right now. Any recommendations for a Toroid feeding 3 of these? AMP5 kit - Tripath TA2022 41Hz Audio:AMP5 kit Although, I might just get one for starters and build a small desktop amp for 2 channel speaker set up for my computer workstation. -Ed

I saw this in a post somewhere and assumed it was a typo, but it is in fact real. Here's a linky to the page: http://focus.ti.com/docs/prod/folders/print/opa827.html. Aparently an upgrade to the 627. I'm a big fan of the 627 (I know, it's just an opamp, discrete rules, yadda yadda), so I'm quite anxious to hear what this new flagship is all about.

I've acquired some parts that need to be put to use... don't know what project would be appropriate though. I've got 2 PCBs for an adjustable power supply that can put out a max output of 2A and a voltage of under 25V. I've also got some tube prototype boards with 2 9-pin sockets on each, like this: What I need is an idea of what I can do with these parts... something with 12au/x7 perhaps?

I'd love to hear your impressions it's not every day that a different crossfeed circuit comes about but, when it does, it's worth trying. Unfortunately I don't have any 18K resistors to hand (everything else but ) have ordered some and they will be here Tuesday...... in the meantime if any of you finger on the iron fast guns feel like trying it out and giving feedback it would be appreciated. Feedback in this thread here please, my joint couldn't handle the bandwith, Just thought I'd put this by you guys and trust you'll appreciate it. Pinkie.

What standards are people using for reterminating these? I'm planning on a single 4-pin XLR rather than 2 3-pin as it is less cumbersome. Does a male connector on the phones with pin 1 for R+, 2 for R-, 3 for L-, and pin 4 for L+, and 2 and 3 connected together for use in single ended amps sound right? Also, anyone know the stock Grado wire colors before I cut this thing apart? If it matters, these are RS-1's bought about 6 years ago.

I have question about how to hold a rubber sealing ring in place when closing two halves of an electronic component. I'm trying to assemble a backup controller for my ebike. I want to match up the good front from one controller with the good back from another. There is a rubber seal to go between them. The problem I'm having is that the seal won't stay in its groove dry. Would it be ok to use something like a bit of Vaseline to hold the ring in place? Maybe something else?

We're doing a quick moving T2 board set group buy; there are two members and we have a quote for two more (but will go ahead regardless). Specs are ... FR4Blue solder MaskWhite silkscreen2.36 mm thicknessENIG3 oz cuIPC-class 2100% e-TestedThe buy consists of a set of the full sized boards; one power supply and one amplifier board, $225 for the set + shipping and PayPal fees. Post interest here and we will close the buy in one week. If we have more then 4 participants the price will be lower.

My b22 has felt feet and is in dire need of something, anything better that will provide some lift. Also what version of loctite is safe to use on nuts, bolts, screws, pots inside the amp? Things were pretty loose when I got it and have been tightened but I'd like it to be a one time thing

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.

Looking for some one to build me 3 pin XLR's To Rca , or 1/4"'s to RCA to hook my Begringer DEQ2496 to my headphone amp. Can anybody help me out?

So I don't make mistakes in my latest build I was wondering what is reccomended most. Should I twist the AC power leads on a torroid being used in a DAC? Should I twist the DC power hookup wire that will go from the PSU to the DAC board? I'm assuming I should always twist the signal wires...

So I've been on vacation for the last few days and decided to go play with my tube amp since I had nothing better to do. After reading a whole bunch of stuff on the diyaudio forums I got a bunch of stuff together and played around with various power supplies for the heaters in my tubes. First off was a generic DC power supply I got as a kit in the local electronics store way back when. It sounds decent, with Grados there's more background hiss than I'd like but other than that I didn't notice anything wrong with it until I got the good stuff. Next was a benchtop power supply I found in the surplus shop. This is the quietest power supply, with Grados there's just the…

I have some Grado Aluminum headset blocks that I got from the guy in Malaysia. I've been trying to find someone who will do a small job like this but have been unsuccessful so far. I would like to get R and L milled into them with the square border areound the letters like on the Factory plastic blocks. Anybody have any suggestion for someone who would do something like this?

The part tested ok and seems to a 15 volt reg mc 7915ctg mc 7815ctg Bottom right is where the reg were Below the vishey 4700uf caps

I have a couple of DIY questions: This one is pretty basic. I need an easy to use, lead-free solder. I'm guessing a lead-free eutectic solder is what I'm looking for. Is this correct and do you have any recommendations. Also, please recommend a source for it. Not that I'll be needing this information in the near future, but I have a question about Magnequest. I see a lot of other brands talked about here and almost no mention of this one. Are Magnequest not great transformers? Or maybe there is some other problem with them or the company? Or lastly, maybe nobody here uses them due to habit? I'm just curious as I know that Bottlehead likes and uses them.

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…

Sorry to start a new topic on this, but I thought if I posted it on a previous thread it would get lost. The issue with the original power supply was that it was noisy at times. I had originally measured < 2 mV power supply noise, and 3 - 5 mV noise at the amp outputs. But on re-measuring, the power supply noise was > 5 mV with the amp output noise measuring around 50 mV. In fact, the noise measured before and after the regulator was similar. Thinking the regulator was noisy, it was rebuilt with new devices, without improvement. Since the current source (CCS) in the positive supply line should block noise from the raw positive supply, the likely …

I want to experiment with making some data only USB cables. Looking at the specs of the bulk USB cable by lcomm it shows 28awg twisted for the data lines. Is it ok to use stranded?