F5 Turbo Circuit Boards

[Rixsta]

Hey, cheers
Not sure of a good place for the aluminum
Have seen soft-starts on ebay but it would be better to make one from scratch i bet.

Iv'e just posted a help thread here lol

 

[BigE]

no smoking. this is the wrong diagram. delete it and forget it
her is the correct one

So what do you do for multiple P and multiple N channel? Do you just wire in parallel?

 

[AndrewT]

Bige,
have you read the Pass literature?

 

[Earthquake]

Resistors

Here the picture

Can anyone inform me where the red resistors on the circuit boardcan be purchased or who the manufacturer is.

 

[noSmoking]

hi,

Can anyone inform me where the red resistors on the circuit boardcan be purchased or who the manufacturer is.

Can't see a picture?
Mouser and digikey got all kinds of them Dales,ohmite's
Try a pic again ,check to make sure it uploads! then submit,just trying to help.
NS

 

[noSmoking]

Hi BigE,

So what do you do for multiple P and multiple N channel? Do you just wire in parallel?

Looks like that will work,In nelson's manual he says you will need more PS and possibly to piggie back the small fets for more gain to drive them,reread the article,he outlines it well enough ,IIRC he also tells how he biases them to.
Try this link http://www.firstwatt.com/pdf/art_f5_turbo.pdf
regards,
NS

 

[Earthquake]

Can't see a picture?
Mouser and digikey got all kinds of them Dales,ohmite's
Try a pic again ,check to make sure it uploads! then submit,just trying to help.
NS

Hi noSmoking thanks for the reply I have received the information via a PM so I have the info I need.

 

[billyk]

Can anyone inform me where the red resistors on the circuit boardcan be purchased or who the manufacturer is.

Pretty sure that was the "kit" from buzzforb's GB. If so the red resistors are PRPs I know that Parts ConeXion sells them.

 

[Earthquake]

Pretty sure that was the "kit" from buzzforb's GB. If so the red resistors are PRPs I know that Parts ConeXion sells them.

Your correct they are indeed PRP I am just looking to see if there is a supplier in the UK to save me looking is there a BOM on the forum for the F5T cascoded and non cascoded anyone??

Ian

 

[Marra]

Here you go Ian.

PR9372 metal films, Amtrans carbon film,Audio Note,Shinkoh,Charcroft,Takman,Arcol,Mills,Takman,Holco,Allen Bradley,duelund resistor,Kiwame carbon film,M-resist supreme resistors

 

[noSmoking]

That's great!

Hi noSmoking thanks for the reply I have received the information via a PM so I have the info I need.

Good luck to you!
NS

 

[BigE]

The F5T document says that the outputs are paralleled. I'm assuming that the store output boards can also be paralleled from a single FE board.

 

[6L6]

Yes, they can. You need a second set of PCB, but there are connections to add another set of output boards daisy-chained off the first set.

 

[Lordi]

Board for F5T V3 balanced

hi, i want to create my own pcb board for a balanced f5 turbo v3, and i'm struggling with one thing. there will be a single gainstage board, two p-channel boards and 2 n-channel boards. now my question: do i need a GND on the n-channel/p-channel boards? is it bad to have no caps on the n/p-channel boards? i'm very grateful for your answers here a picture of the schematics (i know, the p-channel MOSFETS are n-channel MOSFETS, but i'm to lazy to create a new library) f5tbalanced8jwx3y9obz.png auf fotos-hochladen.net

 

[Lordi]

Board for F5T V3 balanced

oh, i saw a little mistake, here the correct schematic f5tbalancedewi8ku4m0x.png auf fotos-hochladen.net

 

[BigE]

Yes, they can. You need a second set of PCB, but there are connections to add another set of output boards daisy-chained off the first set.

Thank you!

 

[alex mm]

...... how about this ?

 

[noSmoking]

hi alex

...... how about this ?

Those look nice ,have you got a set made for proto yet?
I would like to make a set of those when they are proven,lol.
Thanks,
NS

 

[Lordi]

thats a nice layout
and balanced output is possible with two boards.

but i don't like two things.
there is not enough space between the mosfets. if the bias is about 0.8 A/output device, and the railvoltage is about 32 volts, it would be about 200 watt dissipation. For this, i need a bigger distance between the mosfets for large heatsinks.
if two boards are assambled there is no thermal coupling from the "left" channel jfets/cascode to the "right" channel jfets/cascode.

for now i'm finishing the layout for the gainstage board, and post it tomorrow.
maybe someone has a little hint for the n-channel and p-channel boards. i really don't get it, is a cap (about 10 µF) or a gnd on the n-channel and p-channel board a must-have?

 

[Lordi]

i'm not ready with my pcb's, but here are my first results
what do you think?