Gb: F5 Pcb

[tinitus]

I thought about changing the footprint to be correct for ZTX, but as you say, people don't read too much so I was afraid of causing yet more confusing.

Sure, I had the same issue when I first tried to learn a bit about this, just enough to do a hardwired F5
Even if I might use BC###, I chose to figure the layout as pr orinigal schematic, as I found that less confusing
But I would suggest to do a board especially made fore hardwired outputstage
One advantage would be easy to adapt to different heatsinks
Other would be learning
Third, it might be easier to implement mods along the way
And yeah, always wanted to do a hardwired outputstage and thought it looked cool

I know, some may not like that at all

 

[cviller]

Here is the final layout - unless someone points out an error. I'll offer a free set of pcbs to the first one who spots a circuit error (not just a silkscreen bug)! 😉

I have added holes for caddocks - it didn't make the board prettier, but since I always recommend tech-diy for parts it would make the most sense if the boards were fully compatible. I have also changed the ztx footprints according to the suggestions I got here on the thread.

Tinitus, I like your idea, but I think this F5 will stay on one board. You should have a look at the BA-1 and BA-2 stuff - that's versatile!! 😎

 

[tinitus]

Oh, I like your board 🙂
Regarding cascode
I suppose its ok you have cascode curcuit spread out and moved away from Jfets
I have no idea about it, but I thought the cascode should be close to Jfets

 

[jackinnj]

Might be a good idea to mount R12,R13 a trifle north of the adjacent mounting holes -- if you use a pan-head screw it might make contact w the resistor (or MOSFET). The Panasonic 3W resistors are an R0617 profile.

The Caddock MP30's, unless heat-sinked, will only handle 2.25 watts. Just want everyone to be aware of that. Here's the datasheet: http://www.caddock.com/Online_catalog/Mrktg_Lit/MP9000_Series.pdf

 

[cviller]

Thanks, Jack - I have moved the resistors. I don't think there will be any problems fitting the panasonics, but I can't seem to find R0617 mentioned anywhere in the datasheet - I thought they were just normal large axial resistors.

 

[jackinnj]

The body length of the 3W 0.47 ohm and 100 ohm Panasonic rez is 17mm and the width is 6mm, ergo R0617. For the 2W 10 ohm rez body length is 10mm and width is 5mm.

 

[cviller]

Great, thanks - fits perfectly. 😉

BTW, I have ordered the boards.😀

 

[npapp]

Cviller, are there any boards still available? If so, please include me for 4 boards. please confirm the price and I will send funds asap.

Thanks,
Nick

 

[cviller]

npapp, I have ordered more boards than there was signed up for, so you can order as many as you like on GB order page for cviller
You can also see the gb list here: Group Buy status page

 

[acold7dusta]

any word of a ship date cviller?

 

[cviller]

No, but it usually takes the 10-14 business days before they ship, so I guess we have to be patient. Usually, they don't even tell me when they ship, so I may not be able to relay much info.. but I'll keep you posted!

 

[a.wayne]

Hello ,

Any word on this yet ...........

 

[cviller]

I asked the company if they could tell me when they would ship and they said they would. I have ordered from them three times before and this how they usually do - not much communication and then suddenly there is a package with some really nice boards! 😉

I ordered right before Christmas, so I'm unsure of exactly how many business days have gone by so far.

 

[bear]

I was thinking more in terms of something like this (just like borbeley does). Just need to simulate if it works in this application.

A good way to handle this is to provide an area on the board that is basically plated trough holes in a matrix (12 x 12 for example) - like a proto board - so that those who want to put in a cascode circuit can brew up their own, as they wish, proto style... simple enough.

Just an idea...

_-_-bear

 

[cviller]

Thats a good idea, but I think with the bjt setup I landed on, most of the prototyping should be possible without too much effort.

 

[bear]

Speaking of which - could you please post again or link again the final schematic and the layout?

I trolled around and am quite unsure what that is - the last i saw was a pdf of a proposed dual jfet cascode input...

I'll deal with whatever it is, but it would be good to clear on it... I'm confused anyhow... but that is easy for me! 😀

_-_-bear

 

[cviller]

Here are the schematics and final layout.

 

[a.wayne]

Hello Cviller ,

Looking at the schematics , you have listed boxed stuff is additions, could you elaborate more on this ...


regards,

 

[cviller]

Yeah, the extra stuff is an option for cascoding. With cascoding you can run higher rail voltages. I have also added footprints for extra mosfets so that you can use two pairs instead of just one. If you just want the normal F5, then don't worry about this extra stuff. 😉

 

[ma_coule]

... don't worry about this extra stuff. 😉

BTW: I'm a little bit worried about "regular stuff"... 😉 😀
Any news?
Cheers,