JoaMat

aluminium allergy Don't like make comments on how things sound or perform. Anyhow, after several hours of listening, I like y3 significant better than my NAD M51 and Benchmark DAC2. OK, I did build it myself which might explain my view. But it's no question that y3 is a high performance DAC and is despite some SMD parts relatively easy to build.

A working y3. All right, need a nice chassis. Indeed, a very impressive DAC from AMB. I’m very grateful for all the work that have been put in this project. Thanks a lot Ti.

Happy Birthday, Kerry!

Downloaded and installed Fusion 360. Have tried it for a short while (raining today). And maybe…. even me might manage to do something with it. Thanks for the tip.

Splendid! Nice work indeed. I’ve a mill, but have to figure out how to make the model…

Yes, 10 volt is correct.

Probably because the 5V doesn’t like shunt mode. From LT1021 datasheet: Three voltages are available: 5V, 7V and 10V. The 7V and 10V units can be used as shunt regulators (two-terminal zeners) with the same precision characteristics as the three-terminal connection.

Transformers in the front (other reason than above though). You like the wiring? Size is huge. Angel brackets adds to much thermal resistance and add space.

Great! T2 current sources with c4686 instead of c3675?

Have you tried the opto servo?

Did this one today. Layout file name is JimL_CS.LYT.

Yep, that’s right. Tried to be smart. Set the cut depth to shallow at first. Ordered the machine to clean up a small area…. and at the same time it cut the trace near that pad. Learning by doing...

I agree with John. Amazing front plate you have done, Kerry. Today I built a T2 servo on a small board. It’s now doing service on an original DYI T2 and seems to work OK. If it really works the layout will be implemented in a new version of DIY T2. Also give me opportunity to learn milling PCBs on a small CNC machine – indeed a funny toy. Did a small mistake - can you find error in below pictures?

Don’t remember the exact words, but she is a very adorable partner. Got this as a present recently………

...fifty free hours, then

Happy Birthday!

Last few days I’ve had some annoying noise from one channel of my Grounded Grid. After a few hours on surgery table I found this three small resistors…. …..obviously I missed solder them on both ends. I’ve used the amplifier like this for almost four weeks before the noise started.

Here is an original T2 with Kevin’s optocoupler servo. Servo is on a small board, replaces one of the 2SC3675 in Darlington pair. Works well…. so far.

With SiC I don't use any shoulder washer, just metal screw - torque set to 81 Ncm on the scale.

4180G

Looks insulated but bottom is not. I use aluminum oxide insulating washer and steel screw. Avoid conductive thermal grease.

If you use the correct shoulder washer and don't smear the junction with conductive thermal grease than it's safe to use steel screw.

Nicely done. That one is a small one. But else surface mount isn’t that difficult, with some practice…. and it's fun.

Once I cleaned a straight six BMW cylinder head in dishwasher. Very handy.

Anyone tried dishwasher?