JoaMat

Seems Birgir is right about noise. I tested it with a scope. As expected the output from the converter is ugly. It’s better after the LT3045 but there is too much noise passing through.

The output from DC/DC converter is pretty ugly. How much of this that will be stopped by LT3045 is to be seen. LT3045 datasheet looks rather nice though. P.S. Should have ordered LT3042 instead.

Which part is the noisy one?

DC/DC converter followed by LT3045 regulator. If this works I've well-regulated 9 V well isolated and hopefully it could be used with NPN current sources. If not I've two dozen of L3045 for sale.

I think I like the c4686 with two LEDs and a 9 volts battery current source.

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I’ve been using the cascaded CCS in T2 since December 2014. It’s my favorite CCS, also used in Blue Hawaii and other amplifiers. Kevin’s idea using DC/DC converter with the T2 CCS is appealing. So I removed unnecessary components and put in 9 volts cells. It works (why shouldn’t it?). Personally I prefer cascaded CCS but if there is a nice way to introduce DC/DC converters I might reconsider. Battery cells is not very convenient.

What kind of gear do you use to get the thermal pictures?

Nothing to fear. With some practice everyone can do SMD soldering and it's fun.

Congratulations Kevin! So now I don’t have to feed ducks anymore, great.

squirrels on Iceland? didn't know that...

The squirrels sits on them.

Lots of converters at Mouser – just have to find a suitable one in stock. Alternatively 9 volts cells....

this one, 12V to 12V and 1/4W

Can a DC/DC converter be used as it is or is some filtering needed?

Very nice indeed.

I like the way Skooby attachs the heat sinks. It’s a Fischer SK 81 - 100 x 37.5 x 15 mm. Found it at a local dealer. Cut it in two halves and it fitted quite nicely. I also use an aluminum net for top cover. Heat sink or nor the heat has get out of the cabinet. At 74 degree Celsius the PTZA06 is good for some 450 mW.

Take a look at this 3M product. 3m8810[1].pdf I use it and I'm confident it will hold the heat sinks safely in place.

Long time since I did this kind of calculations. Try this: (12V/7V * 1.5kOhm) – 1.5kOhm = 1.07kOhm. If I’m wrong you get something else.

Milled a couple of small board 0.8 x 1.15 in. Put a cheap USB microscope on CNC machine. Easy to move microscope over the board. Took this picture, optical magnification x40.

nope

Actually a new airline. SAS was kind of not interested. Operation is planned to commence next week. Free electrostatic earspeakers. Proud to announce our new Head of Flight Operation. Here is a link to the interview with him, a very experienced guy. CV interview

Flying three-layers on single malt is a criminal act in Sweden, no matter how shrinked I am.

Yes, same as the T2 current sources except 2SC4686 instead of 2SC3675. Two LEDs and emitter resistors on bottom side. Today I visited a fantastic DIYer. He designs and builds his own small metal airplanes. He let me use his equipment to cut 1/16 aluminum sheet. Thoff thoff and I had perfect fitting top and bottom covers.

Carbon with 2SC4686 current source at the left. Inspired by works of Soren, Kerry and the team behind the DIY T2. Original design by Stax (I believe). No more speed ticket for violating the 450 limit.