First Watt F7 review

[PKI]

Working on a psu for the amp, where do you think is petter to put more capacitance before or after resistance: 1. CCCRC, 2. CRCCC or 3. CCRCC?


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[Zen Mod]

why not trying with Duncan's PSUD ?

whatever , CRCCC is most probably best compromise

 

[ElFishi]

Working on a psu for the amp, where do you think is petter to put more capacitance before or after resistance: 1. CCCRC, 2. CRCCC or 3. CCRCC?

I asked the same question in this post
and used both Duncan and LTSpice for simulation.
In my case I found that a symmetrical arrangement looks good. Not sure that this is a rule.

 

[PKI]

Thanks! Will check that software out.


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[pr]

Nelson didn't post the F7 on firstwatt.com. Maybe he is too busy building the F8.

 

[lhquam]

Nelson didn't post the F7 on firstwatt.com. Maybe he is too busy building the F8.

The F7-turbo is coming soon!

 

[rayma]

In my case I found that a symmetrical arrangement looks good. Not sure that this is a rule.

NP calls this the "even-steven" rule.

 

[Nelson Pass]

The F7-turbo is coming soon!

The Turbo version is one one I mentioned that I abandoned.

 

[generg]

So we will stay possibly with the bicycle version.....


But so far as I know lhquam, he will do his best.....

 

[generg]

Nelson didn't post the F7 on firstwatt.com. Maybe he is too busy building the F8.

I am not so sure that Nelson will continue in all eternity to serve us with lovely amps.......

maybe he will enjoy a sudden change of subject......

 

[lhquam]

The Turbo version is one one I mentioned that I abandoned.

Did you abandon the Turbo version because you couldn't achieve the desired performance, or other reasons?

 

[2 picoDumbs]

I was under the impression the turbo version was with negative feedback

 

[generg]

Not with Lynn, he will of course use both kinds of feedback!

 

[2 picoDumbs]

Not with Lynn, he will of course use both kinds of feedback!

Yes of course.
I say, go for it.
Maybe 30V supply.

 

[lhquam]

Yes of course.
I say, go for it.
Maybe 30V supply.

Simulations give:

30V rails => 40W at below 1% THD
35V rails => 60W at below 1% THD

 

[2 picoDumbs]

Simulations give:

30V rails => 40W at below 1% THD
35V rails => 60W at below 1% THD

What does 1W HD look like under both conditions.

 

[Nelson Pass]

Did you abandon the Turbo version because you couldn't achieve the desired performance, or other reasons?

I liked the much simpler amplifier.

 

[lhquam]

I liked the much simpler amplifier.

Just add 2 transistors and 5 resistors and stir. Oh, BTW, use bigger lateral fets too. I believe that it will closely duplicate the F7, but at higher output power. I am still acquiring the parts to build it.

 

[lhquam]

Actually, maybe only two extra components plus bigger laterals and higher rail voltages.

 

[2 picoDumbs]

Another review by David

https://translate.google.com.au/tra...iolator/FirstWatt.F7-recenzja,712&prev=search