On Semi ThermalTrak

[ostripper]

These are "scary" proprietary devices , would be hard to find
in some parts of the world ,and could be emulated by proper
design. (Vbe tranny or diodes bolted right on ,or close ,to output)

Maybe it is good for Sony, JVC to use these devices for
thermally challenged consumer garbage , but DIY'ers should
stick to common devices.


Absolutely , thumbs down..OS

[jacco vermeulen]

Originally posted by ostripper
use these devices for thermally challenged consumer garbage

[guitar_joe]

i read the silicon chip mag issue with that module.
can't really say im too interested.

my main diy power amp uses the 2 of the older 1996 silicon chip 185wrms modules and two individual 300va tranny power supplies with 16000uF of caps PER RAIL.

these new amps would be perfectly suitable for that chassis however these amps run cool and clean so no point upgrading them.

these thermal track power transistors would be great for under engineered stuff and amps that really get a work out i think.

[homemodder]

Hi ostripper

I disagree with you, I think these devices have a lot of advantages and no disavantages, there are better power transistors available, it would be great if they incorporated this tehnology. I believe sanken also have some devices like this, will still look into it.

Jacco nice pic, no tell us what that system consists of. Are those DIY amps???

Guitar Joe, simple is better if it has same performance, and even more so when it has performance advantages.

[jacco vermeulen]

Originally posted by homemodder
system consists of.

Classe Omega preamp and Mr. Charles Hansen's GMAFB MX-R power amps.
Ya Kneu :the ones with ThermalTrak devices, 16 per channel.
(the screw type PS-connectors on the pcb are cool, i use them as well, manufactured by Riacon)

For DIY sniffers : a piccy of the Omega PS board with the first stage +/- series regulator for 1 channel, second stage is a separate shunt regulator (lateral mosfet) on a heatsink.

[jackinnj]

Originally posted by ostripper
These are "scary" proprietary devices , would be hard to find
in some parts of the world ,and could be emulated by proper
design. (Vbe tranny or diodes bolted right on ,or close ,to output)

Maybe it is good for Sony, JVC to use these devices for
thermally challenged consumer garbage , but DIY'ers should
stick to common devices.


Absolutely , thumbs down..OS

I disagree. On Semi keeps devices in their catalog for a long time. The ThermalTrak transistors are available from a wide number of sources, and they are seemingly easier to implement than the diode-incorporated Sanken's.

And the benefit -- as the thermal compensation is immediately adjacent to the junction the time for which compensation is effected is much faster than the temperature change crossing over the heat sink.

You could explore the benefit empirically and report on your results -- just set up an amplifier with Thermal Track devices -- for one set of experiments use a conventional VBE multiplier with the ThermalTraks, for the second hook up the incorporated diodes -- and report back to us with your results.

[jacco vermeulen]

Keep that car wrecking woman away from my (chevy) suburban.

[roender]

RMI-FC100, a single stage audio power amplifier

[pliedtka]

Keep that car wrecking woman away from my (chevy) suburban.


2002 Chevrolet Suburban mileage 54,000: Third and forth gear went out at 39,000 miles. Had transmission rebuilt. Old transmission had intermittently noticeable 1-2 shifts. Rebuilt has good 1-2 shifts and violent 1-2 shifts. Truck usually starts out with good 1-2 shifts and migrates into violent 1-2 shifts, but there doesn't seem to be any solid consistency to this pattern. One transmission mechanic using his Sun diagnostic unit saw a 1-2 error with a shift rate of .28. MAP, TBS, EGR, and everything else ok. Truck starts fine and engine has been checked. All other electrical seems to be fine.

[ostripper]

I disagree. On Semi keeps devices in their catalog for a long time. The ThermalTrak transistors are available from a wide number of sources, and they are seemingly easier to implement than the diode-incorporated Sanken's.

I totally
agree with the thermal compensation superiority of these devices ,
but not everyone lives in NJ,USA , some of our foreign comrades
have a hard time finding MJE 340's, so I like to stick to common
parts. Most of my amps use "street parts" recycled from
the dumpster(except for capacitors ).

Also,with the diode on the die wouldn't there be "cycling"
or a thermal feedback effect by having an OVER responsive
compensation scheme.?

I can't find them at newark.com,farnell has them on backorder
,google search :thermaltrak
no dealers, google search 2sc5200 ..dealers galore
I,m in the USA but I still don't get instant gratification!!!

I,d rather superglue the diode right to the face of a $1 2SC5200
before I.ll go in search of exotic parts.(still I'd like to try them..
,any dealers??)