Actually on Cviller V 2.0 boards looks like it's R1+R2 you're looking for which connect to the Source leads of the input JFETS. NOT R3+R4!
This is not an F5, but a Pass Aleph 3 -- The F5 might actually be less complex.
Milan's DIY Audio - Photography - Folkdance
I think it's extremely beautiful.
Ok thanks 6L6, it's really a nice work he has done...
It's because the F5 schematic is quite simple that I thought built a point to point wiring amp...
Damien
It's because the F5 schematic is quite simple that I thought built a point to point wiring amp...
Damien
Yes, even simpler when no limiter circuits are implemented.
I have been contemplating for a while to wire it so between input and output sockets as stands.
I have been contemplating for a while to wire it so between input and output sockets as stands.
For your inspiration (F5 without the limiter circuit):
An externally hosted image should be here but it was not working when we last tested it.
Components only should be possible.
Ten stands available.
input
input ground
output
output ground.
Six mosfet legs.
Ten stands available.
input
input ground
output
output ground.
Six mosfet legs.
Just for more inspiration. Evolve amplifier.
see bottom page. And this amp is complex compared to F5, even to F5c.
see bottom page. And this amp is complex compared to F5, even to F5c.
Don't rely on accuracy or truth in Far East advertising.
Proudly proclaims
Yet they clearly show the NFB gain loop consisting of 5k1 and 430r.
Proudly proclaims
Yet they clearly show the NFB gain loop consisting of 5k1 and 430r.
Andrew, I know what you were probably thinking but, I beleive those Rs are not forming a F.B. loop 
Their Gnd'd 
Their Gnd'd
But no feedback across the output; in that sense this 'inverted daulington' looks very similar to the BA3 frontend/BA2 output, here linked in DC - and having a darlingnot at the output.
I commented on that idea in the BA-3 thread when is came out regarding coupling directly to the BA-2 Output, but didn't get a large response.
From Post #252
I saw that, flg,
But your idea can work if you have the output connection floating, that is: the other side of the speaker goes to to two caps connected to plus and minus rail. 10.000 uF is more than enough.
Well, as such the Evolve circuit does have operating point stabilization: feedback is DC.
But your idea can work if you have the output connection floating, that is: the other side of the speaker goes to to two caps connected to plus and minus rail. 10.000 uF is more than enough.
Well, as such the Evolve circuit does have operating point stabilization: feedback is DC.
I *think* the F5c boards have 8cm inner mosfet spacing - the tentativeness is that I only have access to the 2009-12-20 rev of the board, which *is* 8cm for the inners. The diyAudio shop only sells a later version (2011-02-09).
Comparison of the two versions of F5 board that I have :-
An externally hosted image should be here but it was not working when we last tested it.
HTH
cheers
Nick
Interesting. The bottom board you show (F5C v2.0) has MOSFET spacings different from what the DIYAudio Shop shows for P-F5C-2V20 2011-02-09. Yours is clearly the old version of the board.
That board with the 8cm inner MOSFET spacing would work for me. I am looking for either 2 or 4 boards. Are you willing to sell any?
I have two of the 2009-12-20 boards by Cviller from the shop that I am willing to let go of or trade. It has some of signal resistors already on it CMF-55s.
I going to be stuffing up a dual-output version, so unfortunately not - these two are the only ones I have of this shape and I don't want to play with cascoding just yet.
I rummaged in my box-o-bits and I do have a pair of unused pdaniels boards as well, which look like they'd do 8cm spacing, and I know I won't get round to using them - they're the little ones below
An externally hosted image should be here but it was not working when we last tested it.
And I see Tea-bag has some of the cviller boards (and he's on the same continent too 😛)
If the pdaniels boards are any use, pls drop me a PM
cheers
Nick
I have 2 Cviller F5 v2.0 2010-10-23 boards I could trade.
I also have 2 Cviller F5c V2.0 2011-02-09 boards I could trade.
There probably isn't much else in my parts pile that you might want, since most of it dates back to the 1960's.
Thanks for the offer, but the Pdaniels boards won't work for the way I intend to mount them as shown in this post:
http://www.diyaudio.com/forums/pass-labs/206756-f5-turbo-circuit-boards-83.html#post2928566