F5 Turbo Circuit Boards - Page 194

a.wayne · 30th December 2012, 11:02 PM

Are we there yet .....?

thor61 · 01:10 AM

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 ...

Renron · 31st December 2012, 10:16 PM

Quote:

Originally Posted by dazed2

Thanks!
I saw that cascode equation.

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

buzzforb · 10:37 PM

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.

Rush · 31st December 2012, 10:40 PM

Quote:

Originally Posted by thor61

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 ...

You should contact Nelson Brook or Variac for those boards. I didn't know anyone had boards yet.

Rush

nrg2009 · 31st December 2012, 11:58 PM

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.

Renron · 1st January 2013, 12:54 AM

Quote:

Originally Posted by buzzforb

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.

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

AudioSan · 1st January 2013, 02:08 AM

renron. if you download the BOM i sent on the last page or somthing, then you will find the cascode formula on page2

Variac · 1st January 2013, 02:10 AM

Quote:

Originally Posted by Rush

You should contact Nelson Brook or Variac for those boards. I didn't know anyone had boards yet.

Rush

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

AudioSan · 1st January 2013, 02:12 AM

variac. have you sent the info i needed?

31st December 2012, 12:53 AM	#1932
thor61 diyAudio Member Join Date: Feb 2010	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 ... Last edited by thor61; 31st December 2012 at 01:10 AM.

31st December 2012, 10:32 PM	#1934
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	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. __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man! Last edited by buzzforb; 31st December 2012 at 10:37 PM.

1st January 2013, 02:08 AM	#1938
AudioSan diyAudio Member Join Date: Feb 2009 Location: Trondheim	renron. if you download the BOM i sent on the last page or somthing, then you will find the cascode formula on page2 __________________ aleph P1.7 pre. F5 power amp. CDpro2(need DAC). Vivaldi8 speakers

1st January 2013, 02:12 AM	#1940
AudioSan diyAudio Member Join Date: Feb 2009 Location: Trondheim	variac. have you sent the info i needed? __________________ aleph P1.7 pre. F5 power amp. CDpro2(need DAC). Vivaldi8 speakers

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

30th December 2012, 11:02 PM	#1931
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	Are we there yet .....?

31st December 2012, 11:58 PM	#1936
nrg2009 diyAudio Member Join Date: Apr 2009 Location: Detroit, born and raised in the netherlands.	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.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
F5 Turbo is posted	Nelson Pass	Pass Labs	589	1st March 2013 01:19 AM
F5 clone boards (inc PSU boards)	Tazzz	Swap Meet	18	24th January 2013 12:43 AM
F5 turbo problems	Rob Dingen	Pass Labs	17	11th January 2013 08:38 PM
F5 Turbo ............. if only !!!!!!	a.wayne	Pass Labs	23	21st January 2012 02:24 AM
UGS Boards and F5 boards	DUC985	Swap Meet	0	7th January 2009 07:21 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read