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Old 3rd February 2013, 06:19 PM   #1241
Nikitas is offline Nikitas  Greece
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And also I noticed that the heatsink within about one minute had room temperature!That was fast!
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Old 3rd February 2013, 07:32 PM   #1242
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The 2sk1530 has lower Vgs for given current in comparisonto 2sj201. If youhad both pots set to 1.5V, you would have sythe sk1530 biased fairly high, while the 201 would just be just turning on. Takr a look at the datasheets for appx Vgs for a given current.
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Old 3rd February 2013, 07:38 PM   #1243
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I had them both set at 3V like we had discussed.
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Old 3rd February 2013, 07:40 PM   #1244
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Quote:
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THey will work great and will plug directly in with little effect. Just look up their datasheet and try to get an idea of the VGs needed for the bias you want. Before plugging them in, set your pots below that point about 25%-50%. You have tested you FE and all is good. As long as you mount and isolate them correctly, you should be able to listen within the day.
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Old 3rd February 2013, 08:24 PM   #1245
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Odysseas - goal is to set them at desired current - measuring voltage across one of source resistors ;

that voltage is information about current flowing through resistor and mosfet itself



who cares what's Ugs ......


there are few tutorials floating around , and reading them few times is worthwhile
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Old 3rd February 2013, 08:43 PM   #1246
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Yes, thanks ZM, looking at the differences at the datasheets of the two toshibas, I wonder what would that (desired) current is. I just want to be at all times class A.
There is quite some difference at the current drain at the same voltage, like buzz pointed out.
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Old 3rd February 2013, 08:51 PM   #1247
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Shoot for 300mV to 400mV across the Rs. Start at 300 and let it warm up.
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Old 3rd February 2013, 09:19 PM   #1248
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Quote:
Originally Posted by Odysseas View Post
Yes, thanks ZM, looking at the differences at the datasheets of the two toshibas, I wonder what would that (desired) current is. I just want to be at all times class A.
There is quite some difference at the current drain at the same voltage, like buzz pointed out.
do what buzz buzzed few times to you , already ;

stay in ballpark for your project (didn't read which iteration you are exactly building) keeping in mind that (say) 40W per device and 55C at heatsink are limits which you must respect
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Old 4th February 2013, 12:47 AM   #1249
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THis is probably done wrong, but i think this is my 1W performance
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File Type: pdf F5T V2.pdf (96.6 KB, 119 views)
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Old 4th February 2013, 01:05 AM   #1250
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Awesome!

How do you read that graph... ?

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