Or patience. Either will do for me🙂
The Fqa16n/12p20 of current GB range from 3.7-4V and 4.7 to 5.2V @ 1A
I had close to that at 1A. I ended up having a lot more heatsink and now have them each more towards 1.5A and got a huge divergance. The funny thing is it sounds better hotter despite worse matching n-p.
So, can one assume of a given pool of size k that you'd get more n-p matches at 0.5A than 1.0A than 1.5A?
the answer.....😀
right side 4,25/4,37 @1,4A
left side 4,25/4,37 @1,4A
I will ask him if he will match me some pairs for 1,4A
but is it of any use? 😕
still have the impression sound is more defined.....🙂
may be it is more the similarity of right and left channel...😛
right side 4,25/4,37 @1,4A
left side 4,25/4,37 @1,4A
I will ask him if he will match me some pairs for 1,4A
but is it of any use? 😕
still have the impression sound is more defined.....🙂
may be it is more the similarity of right and left channel...😛
normally I would not believe it....
may be the close matching is of no use, but it shows that alweit is a very serious guy...
may be the close matching is of no use, but it shows that alweit is a very serious guy...
I am surprised that his pricing is that good. He has to be pulling from the extremes. I have purchased from him before, in bulk, and he is indeed good to deal with. You will see greater seperation in their response from signal chnages, but this can be minimized by paralleling devices. Excellent info, Generg.
buzzforb,
what do you mean by this...?
"You will see greater seperation in their response from signal chnages, but this can be minimized by paralleling devices."
what do you mean by this...?
"You will see greater seperation in their response from signal chnages, but this can be minimized by paralleling devices."
Just because they match up in terms of Vgs vs Id, does not mean that they have similar Yfs, so they will respond differently to an incoming signal. The datasheets show the 240 as having a Yfs of 7S and the 9240 having Y(g)fs of 4.2S. If a 1V sine wave is applied to both, you will get different responses. In truth, they are close enough that it is no big deal, as most music happens at very low power levels, but on more dramatic passages, with higher transients, you will have greater seperation, as the N channel part is able to provide more current for a given volt than the P channel part.
Thank you, yes I saw the different Y and the different Ciss and so on.
But what is the different Vgs of normally over one Volt doing? Distorsion? Or is it not important in class A.
Maybe Iwill look at a book......😀😀
But what is the different Vgs of normally over one Volt doing? Distorsion? Or is it not important in class A.
Maybe Iwill look at a book......😀😀
two things , unfortunately :
1. I'm not Pa
2. yes , with Jensen , being xformer sans CT secondary , you must use one per leg
3. looking at schm you posted in #3390 , connection is like attached :
4. #3 and #4 are just to confuse you , considering two things mentioned
I really like the balanced headphone amp I built. I am thinking about building a SE unit for another system.
As generg pointed out matched irf240/irf9240 are available. As an experimentI could try a pair of these or stick with the 510/9510s . Have both
I would use the Jensen JT-123-Flpch (purchased 4) mentioned in the F6 thread instead of the Jensen JT-123-ALCF (no longer available)
Are C1 and C2 in the original HP circuit there to block DC. Are they necessary if a transformer is used
Thanks
yes, they are still necessary
where you are going to insert xformer , exactly ?