Quote:
Originally Posted by lhquam
Heat dissipation is not an issue for such a low resistance. The idle power will be Ibias^2*R. For Ibias=1.5A, and R<0R44, the power will be less than 1 watt.
By KBK
Which means you can move to 3 watt surface mount foil.
http://www.digikey.ca/product-detail...8CT-ND/1936102
So is it okay to use .1R SMD Foils? For some reason I ordered 1W ones. I soldered leads to them, but now I am worried they are too little.
I suppose I should install and measure heat output.
Originally Posted by lhquam
Heat dissipation is not an issue for such a low resistance. The idle power will be Ibias^2*R. For Ibias=1.5A, and R<0R44, the power will be less than 1 watt.
By KBK
Which means you can move to 3 watt surface mount foil.
http://www.digikey.ca/product-detail...8CT-ND/1936102
So is it okay to use .1R SMD Foils? For some reason I ordered 1W ones. I soldered leads to them, but now I am worried they are too little.
I suppose I should install and measure heat output.
There is not a lot of headroom there, but in reality, on an efficient system like yours, you will never Leave Class A and should be OK. If you were pushing a lot of current, it would be a problem.
If SemiSouth SJEP 120100 is obsolete now why don't we use cascoded LU1014D as replacement.
Let you guys more literate than me think it over. Will it work ? Supply voltage is exactly the same.
Let you guys more literate than me think it over. Will it work ? Supply voltage is exactly the same.
Please see post # 3350 and later ones. DIYer DougL also asked questions like you did.
Best regards.
Ooops, my fault didn't read that. But definately there was something in the air. Whose obsolete and extremely expensive transistors are a bit teasing, so one can thing of something instead.
Poor Man's F6 , made with any of usual (enhancement mode) suspects (IRFP , FQ, 2S) will bring enough of buff-IST-wakoo out magic
when I'm in doubt , you'll always see at least triple more dumb smilies included in post
triple - comparing to usual number of dumb smilies in my posts
triple - comparing to usual number of dumb smilies in my posts
Done it with IRF's. Just need a few BLUE Leds, .5 or so source resistors, and your ready to roll. I think it sounds good.
The F6 with IR parts works fine - you need to degenerate the parts with
0.47 ohms or so (maybe a little more) for thermal stability, and you will
find that there is higher harmonic distortion. Typically an IRFP240 will come
in with about twice the THD figure, but as the overall amplifier also has a
distortion contribution from the transformer, you will not see a doubling of
distortion in the overall amplifier.
The primary value of the SS Jfets are less thd and thermal drift, but you can
get along fine with other parts.
😎
0.47 ohms or so (maybe a little more) for thermal stability, and you will
find that there is higher harmonic distortion. Typically an IRFP240 will come
in with about twice the THD figure, but as the overall amplifier also has a
distortion contribution from the transformer, you will not see a doubling of
distortion in the overall amplifier.
The primary value of the SS Jfets are less thd and thermal drift, but you can
get along fine with other parts.
😎
don't believe in everything you read on the web
for instance , don't believe in what I just wrote
I guess we ll just have to wait for some more feedback and see how this "getting along" translates into audible differences... 🙂