JoaMat

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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.

You seem to have a very fruitful collaboration, ang728 and jeohpj. Congratulation to really nice amplifiers.

Wow, very nice!

Interesting topic this inlet AC controlling. Found this board in my closet. Small power supply with a PIC 10F202. Input IR and toggle momentary switch. Out to SS relay and two color LED for on/off indication. This board has served in a T2 power supply. For some reason it didn’t work when I used it for BH and Megatron. Those amplifiers draw more current than the T2 and the control powered up just to fall back to off within a second. So I took it out. I’ve a similar board with SS relay onboard in a KGSShv power supply and that works OK. Mean Well has small power modules that might be used to power the control unit. Like this. Correction: not toggle switch - it is a momentary switch.

Nice! Is there a trimmer on the vertical board? Looks so to me.

Went back and looked at this again; a lot to like here! Agree. I like the small boards close to power inlet. @sorenb I guess the power switch on front panel is a toggle type? Is the switch just an elegant black one or is there light in it?