F5 power amplifier
- Thread starter Nelson Pass
- Start date
Exactly. They should have called it "Super Happy Fun Feedback"
The reason why I was confused was that I recently saw a circuit from Kaneda where he uses real output current (i.e. sensing resistor in series with load) as feedback.
Then I remebered seeing the term on the AD844 datasheet, and Google sorted the rest out for me.
But as Nelson said, the term as used by the chip companies is misleading. The way Kaneda is using it is true current feedback.
Being impatient, what about DC stability and noise performance in this implementation -- 2 well-known drawbacks of "current feedback" opamps ?
Patrick
Then I remebered seeing the term on the AD844 datasheet, and Google sorted the rest out for me.
But as Nelson said, the term as used by the chip companies is misleading. The way Kaneda is using it is true current feedback.
Being impatient, what about DC stability and noise performance in this implementation -- 2 well-known drawbacks of "current feedback" opamps ?
Patrick
EUVL said:
Hello Patrick, well I use this term (appropriately or not, I don't know) for feedback connections which go to emitter/source node of the input.
I see a unity gain CFP as 100% feedback ("current feedback"). But I don't want to start a semantic dispute, there is at least one big thread here from 2-3 years ago about this.
Tino
Tino,
No dispute. I got it now.
Thanks,
Patrick
No dispute. I got it now.
Thanks,
Patrick
Blues said:
Don't get to excited by either the sim or the simplified circuit. The
actual gain is 15.2 dB or so into 8 ohms.
I’m really interested in this F5 because the basis is quite similar with my BaboZen (Papa’s Z5 with input JFETs), and particularly because I’m happy user of the excellent sound of BaboZen. It would be a very simple work for me to convert my BaboZen into this F5 if I count only the number of components I should replace.
Hmm . . .
Unfortunately, however, my BaboZen is at home while I’m away from home across the sea . . .
Hmm . . .
Unfortunately, however, my BaboZen is at home while I’m away from home across the sea . . .
> Being impatient, what about DC stability and noise performance in this implementation -- 2 well-known drawbacks of "current feedback" opamps ?
Nelson, any comments ?
Patrick
Nelson, any comments ?
Patrick
Nelson Pass said:Now I've done it. The F5 isn't even out and some of you will
already be scrambling to build the two balanced versions.
To Steen: I guess you are already done with the chasis, heatsinks, PSU.....just waiting for the final schematic, and..we can expect the comment about F5 next weekend?
Nelson, thanks a lot. It is a joy to have something fresh.
I guess that the sound iof F5 is similar to that of SoZ, but with a lot lower distortion...
By the way, what is its output impedance?
Best wishes and get well soon...
EUVL said:
It seems quiet and stable enough. Of course the actual circuit has
temperature compensation for DC stability and also implements
some current limiting (which you can ignore if you like).
I look forward to the full schematics.
Thanks,
Patrick
Thanks,
Patrick
Re: May Audio Xpress just arrived!
Sounds like a fun read. Hopefully I'll receive my copy sometime
this month.
Dennis
Ren said:I turn to page 8, and there is:
"The F5 Power Amplifier
This minimalist amp design is so simple, well, even a caveman can do it."
Well, OK... but can I?
Thanks, NP.
Ren
Sounds like a fun read. Hopefully I'll receive my copy sometime
this month.
Dennis
America ........ naah ....
too far
so - I'm expecting - what else -any kind soul having these few pages -willing to scan and send to >choky@neobee.net<
Papa ?
you know that I'll not build it
too far
so - I'm expecting - what else -any kind soul having these few pages -willing to scan and send to >choky@neobee.net<
Papa ?
you know that I'll not build it
Vix said:
Same as above.
What? None of you guys will build the F5?
Dennis
Dennis Hui said:
What? None of you guys will build the F5?
Dennis
me certainly not
