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Old 10th October 2012, 03:02 PM   #471
kroyin is offline kroyin  India
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Yes and they are 10.1 mA & I'm doing the V2
Well Google threw up a good DIY TO-92 heatsink solution ..
I'll give that a try
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Old 10th October 2012, 03:21 PM   #472
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TO-92s aren't designed to shed much heat. Heatsinks aren't much use with them.
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Old 10th October 2012, 03:23 PM   #473
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With 32 v rails, Nelson advises either cascoded FE or more degeneration. Otherwise you are really pushing the jfets. Add to that th einternal case temp.
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Old 10th October 2012, 03:46 PM   #474
kroyin is offline kroyin  India
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Thanks everyone..as per manual

A wise DIYer will either select a Jfet with a lesser Idss (say 8 mA) and/or see to it that the Jfets gets some cool air or a little heat sink. Or you can cascode them

Cascoding is out of equation ..8mA with heatsink & air(no problem we have ceiling fans :-)) it will be
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Old 10th October 2012, 04:33 PM   #475
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Point is simply to watch temperature. What path you choose is up to you. A jfet with higher idss, has higher yfs, and as a result, is more linear with lower distortion. I would get as high a idss fet that i could find and cascode or degenerate, butthats me.
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Old 10th October 2012, 08:03 PM   #476
AndrewT is offline AndrewT  Scotland
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I was thinking about starting a thread titled "shaving To92 transistors to improve performance".

But I have little to get started with, other than I have filed a couple down to 1mm thick, 0.5mm either side of the leg locations and they still appear to work.
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Old 12th October 2012, 11:58 PM   #477
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Hi
The original F5 is enough power for my situation , but if I want to upgrade the F5 to this new F5 non turbo( not to install power diodes ) to drive speaker 4 ohm load ,and to cut cost further can I reuse old power supply that is +- 24VDC and the four 100 ohms remain , I do not mind a bit of power lost , because it is a lot easier , just a drop in replacement PCB module,Thanks for your help.

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Old 13th October 2012, 01:19 AM   #478
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by buzzforb View Post
Point is simply to watch temperature. What path you choose is up to you. A jfet with higher idss, has higher yfs, and as a result, is more linear with lower distortion. I would get as high a idss fet that i could find and cascode or degenerate, butthats me.
Got yours up and running yet ..?
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Old 13th October 2012, 01:33 AM   #479
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HA!
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Old 13th October 2012, 01:48 AM   #480
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Quote:
Originally Posted by AndrewT View Post
I was thinking about starting a thread titled "shaving To92 transistors to improve performance".

But I have little to get started with, other than I have filed a couple down to 1mm thick, 0.5mm either side of the leg locations and they still appear to work.
Hi
Did you file the flat side of TO92 , is this the max limited you can file ?Can it be filed a bit more ? I am thinking of filing the pairs Jfets to improve thermal condition ie.. 2 jfets filed and glue together .

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