Quote: Originally Posted by dorkvader I quick search yielded this result: LUMBERG|KLBRSS 3|SOCKET, 6.35MM JACK, CHASSIS | Farnell Israel From your link: Availability: No Longer Manufactured The Neutrik jacks aren't bad. I've got an Eagle layout for the stereo M-Line...

I built an Alien DAC during the PCB group buy. It is a huge improvment over the sound coming out of most motherboards. Worth doing once you know how to solder. This absolutly is NOT a beginner DIY. The PCM2702 DAC chip is in a SSOP28 package. Lead spacing is .025" Not a PCM2702, but...

Quote: Originally Posted by ROBSCIX I figured this thread will allow people to post pictures of their work and ask questions of the more experience designers. ... what software and procedure do you use? I set design parameters, and then design the device. I generally start out...

Quote: Originally Posted by chum_2000_uk British companies selling products made in the UK in the states for less than they will sell them to us! Something not quite right there Part of that is the taxes. UK prices generally include VAT while prices advertised in the US don't...

What sound card are you using? Some of them are terrible. There are some very small DACs out there.

Quote: Originally Posted by Juaquin If you use internal power, I would recommend using the 12V and regulating down to 5V with a nice big cap to filter it. An inductor, perhaps a ferrite bead with a few turns, might be a good idea too.

Quote: Originally Posted by tomb There have been people who've built entire amps using Caddocks and claimed to notice a big difference (improvement) between that and using standard V-D's. The expense is enormous, though, and the effect probably varies with amp design. And I was...

Quote: Originally Posted by Juaquin Andrew, the suspense is killing me - what is that board? My best guess is some kind of amplifier with multiple outputs, each with their own volume control? It is a custom bit for a psychology lab. I was asked to duplicate an existing box. The...

Quote: Originally Posted by Denim What does it take to design a dedicated bit perfect SPDIF PCI card? Card? How about mother board? Intel DG45FC, DG45ID, DP55WG, DH57JG to name a few. All recent Apples have a mini-toslink input and output. Mac mini makes a good media server.

You might be able to get Olimex to make it as 2 or 4 boards on a 320x200 panel. Not ideal but you'd get around the Eagle limit.

The board certainly has room for improvement. Olimex made the boards. Yes Olimex. They've improved. Still have the 1 euro charge for each drill not in the standard rack. I've got part libraries that use the .9 1.0 1.1 1.3mm before plating drill sizes so I don't have to pay the drill change...

Eagle 5.7 / MacOS X 10.5 / Core 2 duo iMac: (This is a rev 001 board done in a huge hurry. Rev 002 looks a lot better but I don't have a photo)

I use Eagle. Added plus is that is is cross platform. I paid for a non-profit license version as some of my projects have grown to 160x100. Eagle has a bit of a learning curve but it isn't too bad. There is lots of help available on-line. Starting with current version, the licences...

Forgot to add -- Are you using RadioShack solder? Multicore or Kester in one of the smaller diameters makes it easier to get the right amount of solder on a connection. You don't have buy the expensive botique solder.

Looks like there might be solder bridges between the power buss and a couple of the op-amp pins. Best to follow Pars suggestion for testing. Quote: Do you think any of these parts are salvageable? Are you thinking about taking the parts off this board and starting over? I'd...

Quote: Originally Posted by squid+ The Cavalli-Kan Kumisa III Stereo Headphone Amplifier Under the "wiring & ground" section Thanks for the information and I appreciate the help. I am planning to put the power supply in a separate case, don't know if that would change anything but...

This might be a stupid question, but why not use S/PDIF if you want more than 44.1kHz and 16-bit? Many computers have some sort of S/PDIF connector. The iMac I'm using at the moment has a mini TOSLINK connectors twinned with the analog headphone and microphone jacks. As I recall (correct...

Quote: Originally Posted by linuxworks l I would not quite trust this since it includes some BD stuff. BD is evil (ie, non-open and very anti consumer). this won't be opensource. I'm pretty sure, just on this, alone. I agree. Best hope for this device is an inexpensive...

Quote: Originally Posted by Syntax010011 Would it be odd if the chip was being burnt out to only kill one channel? Not really. My best guess is there is a wiring problem in the 2nd CMOY that burned out one channel in both amp chips. -- Moving the chip into the 2nd amp killed one...

Have you checked your source? Could be that there is only one channel from the source. If the amp chip is bad, something in your CMOY is burning them out.

Kinda depends what the ground connection is for. Do you have schematic & construction plans you can show us? If it is there for safety, you can might be able leave it out since the case doesn't conduct. If there are any conductive parts that could touch the user (like a volume control shaft)...

Eval board:

Quote: Originally Posted by Squalish How so? . The internal resistance of a capacitor can be very low. A low impedance electrolytic could be .08ohms or even .03ohms. I=E/R I = 100V/.08ohms = 1250A A short circuited alkaline AA battery will put out 10A maximum...

Quote: Originally Posted by Spacehead 470 uF and 250 V capacitor contains lethal amount of energy, right? Yes, a 470µF/250V capacitor charged up can be lethal. Caps charged to a high voltage can store a quite a bit of energy. Energy stored in a cap increases with the square of...

The PTN04050C is also going to put switching noise on the power input. I don't know if the iPod has any kind of a filter. You may need to put a decent filter on the input. A 100uF cap is required, but a pi-filter might be needed.