I would agree, I wish I were qualified to volunteer. But I can only make solder fumes on a good day. Too presumptuous to expect someone to just do it.
I'll chip in $5 towards a set of boards for someone, if they write a build / parts guide with pictures. (incentive)
perhaps others would donate $$$ to buy the boards for some skilled DIY member.
We all would benefit from his/her efforts.
N-Brock, looks like you have a very good start to a BOM. Thank you.
Ron
There will be.
Remember, even though the article has been out for some time, (and all the interest in the F5T has mad that time go very slowly...) the PCB are just now getting tested. Once that process is finished, the maturation of this project into a full-fledged DIY project will commence.
The Build Guide will be coming once the PCB are verified operative and error-free. 🙂 🙂 🙂 (And the volunteers have time to construct and document...)
Nah, just donate the $5 to the Forum. And/or just buy a set of boards when the build guide is good enough that you are willing to give it whirl.
😀 😀 😀 😀 😀
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Drivers 😱
I admitt I haven't been stickin with this thread but, Drivers? It'e not an F5? What article is that in?
6L6,
It was you whom I met at the Burning amp this year, right? A pleasure indeed. I've seen F5T boards for sale elsewhere, and have waited to buy them from "the Store". Yes, I will donate, as in the past. Just anxious, I suppose the extra $5 will help DIYA out of the "Red" we are in a little. I'm so excited, we have boards!
My Thors have been begging for just "a little more juice".
Ron
It was you whom I met at the Burning amp this year, right? A pleasure indeed. I've seen F5T boards for sale elsewhere, and have waited to buy them from "the Store". Yes, I will donate, as in the past. Just anxious, I suppose the extra $5 will help DIYA out of the "Red" we are in a little. I'm so excited, we have boards!
My Thors have been begging for just "a little more juice".
Ron
Yes, I was a 'red shirt' at BA this year. 🙂 It was a hoot! I hope to be there again for 2013.
If you need a little more power than the Turbo should be perfect. Everybody is looking forward to it with baited breath and much anticipation.
Remember, however, that a pair of F4's running from a balanced preamp will give 100WPC into 8ohm... There has been a high-power Firstwatt solution for quite some time -- it just needs an extra step. (And the BA-3 front end or the SYclotron 'Impasse' would be ideal preamps.)
If you need a little more power than the Turbo should be perfect. Everybody is looking forward to it with baited breath and much anticipation.
Remember, however, that a pair of F4's running from a balanced preamp will give 100WPC into 8ohm... There has been a high-power Firstwatt solution for quite some time -- it just needs an extra step. (And the BA-3 front end or the SYclotron 'Impasse' would be ideal preamps.)
Thanks!
I saw that cascode equation.
Does it matter what voltage you end up with as long as it is below the max voltage of the jfets and enough to have it working?
No, but I think about 12V is a real sweet spot for the Jfets. Half the rail voltage, up to a point is practical.
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Are there any of the UKtoecutter F5T v2.0 pcb's still available ? If so how and where does one purchase a set ? They are great looking and the layout is very nice ! The ones in question are shown in post 1911 on page 192 of this thread. Thanks ...
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Dazed2,
Could you point me to that equation please, I've looked back a few pages and I remember reading it a while ago. But for the life of me I cannot find it now.
Thanks,
Ron
A simple view of the cascode is this. R25/27 and R26/28 form voltage dividers. There values form a voltage as result of the small current that passes through them . It is this current which forward biases the diode junction of the bjt and kicks it into action. The same voltage seen by the base appears on the emitter of the bjt, minus the diode drop of about .66V. It acts to protect the jfet, eating up some of the rail voltage. It simply passes the signal, it receives from the Jfet on, eating Mr Miller's lunch at the same time, improving badwidth at higher frequencies. It adds a little voltage gain as well, but I am a little fuzzy on that among other things.....maybe all things.
Happy New Year.
Happy New Year.
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You should contact Nelson Brook or Variac for those boards. I didn't know anyone had boards yet.
Rush
We have nice chassis` in the diy store. Like a good wine we have to wait for all parts to come together.
I am hoping to build a F5Tv2 dual channel in one 5U enclosure.
I am hoping to build a F5Tv2 dual channel in one 5U enclosure.
Thanks Buzz,
Appropriate name on New Years Eve!
Explained very well and so easy even a "Caveman" could understand it.
Like me.
Eating Mr. Miller's Lunch..........LOL
Ron
renron. if you download the BOM i sent on the last page or somthing, then you will find the cascode formula on page2🙂
We've gotten the boards made, now certain members who've been willing to take the risk are building them up to make sure they work.
When we know they are good, we'll put them in the diyAudio Store and announce it everywhere!
Mark
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