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Old 10th January 2009, 03:48 PM   #611
roender is offline roender  Romania
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Quote:
Originally posted by pooge



Is it one like this, stood up with the top lead bent over?


DO35 diode
Yep, that's it, do-35 package
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Old 10th January 2009, 04:10 PM   #612
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Is the 1W requirement for this part correct in your BOM?
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Old 10th January 2009, 04:23 PM   #613
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It is correct. My diode is in a little large package, i think is DO-41 (2mm diameter) glass, but DO-35 500mV will suffice.
In fact, is not important how large this diode is, if it fit between TO-129 cascode devices
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Old 10th January 2009, 05:30 PM   #614
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Great. That makes things easier. I was wondering why you specified a 1W part to carry only 1ma.
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Old 10th January 2009, 06:12 PM   #615
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I was thinking a mechanical switch on the heatsink to trigger a latching relay to cut off power.
But using the diode as a fast warning that overheating is starting to occur,
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Old 10th January 2009, 06:43 PM   #616
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Again. What about the wattage of the 36v zener in the front end power supply? Anything I find availabe in 1W comes in a DO41 package with .8mm dia leads that won't fit in the holes on the circuit board.
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Old 10th January 2009, 06:48 PM   #617
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Quote:
Originally posted by AndrewT
I was thinking a mechanical switch on the heatsink to trigger a latching relay to cut off power.
But using the diode as a fast warning that overheating is starting to occur,

Or perhaps, in addition, use the signal to shunt the bias pot.
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Old 10th January 2009, 07:49 PM   #618
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Quote:
Originally posted by pooge
Again. What about the wattage of the 36v zener in the front end power supply? Anything I find availabe in 1W comes in a DO41 package with .8mm dia leads that won't fit in the holes on the circuit board.
I put in the BOM what I had in my parts box and used in my PSU.
If you do the math you'll see that at Vr 1mA that diode will dissipate 36mW, so 500mW glass case will be more than enough
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Old 11th January 2009, 06:45 AM   #619
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Default Mica insulators

About a year and a half ago there was a thread about thermal pads for TO264 packages like the ThermalTraks, and how no one new a source for any. It looks like after another year and a half, not much has changed.

I did find a mica one from Aavid that would appear to work, but I can't find any suppliers for small quantities. It is model number Aavid Mica Insulator #56-02-101

If anyone can find a source for it, a group buy may be in order. Any other suggestions?
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Old 11th January 2009, 07:02 AM   #620
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Found some here. HUGE price break at 1000.

Mica insulators

Enter part # 56-02-101
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