F5 power amplifier

[Zen Mod]

what else ?



(closest thing to Real McKay was ChefduGaar's (never sure in spelling) uP amp project ; search and ask for needlemeter ; be prepared to read some French ; in fact - you need some biggish meters , and some watchmaking skill , so piece of cake 😉 )

 

[Touister]

It may work, but slightly against my DIY spirit (and wallet).

 

[Zen Mod]

we typed in same time , as it seems

 

[Touister]

Thanks for the clue!

For people interested:
http://psykok.homelinux.org/diy/UP/Build/UPVu.pdf

http://psykok.homelinux.org/diy/UP/Build/Vumetre.pdf

 

[Zen Mod]

yup

.... those overcomplicating Frenchies .......

 

[Touister]

ahah, thanks, I am french 😉

 

[AndrewT]

metre = unit of length
meter = machine for displaying an output

VU meter is a display for Volume Units.

 

[jackinnj]

isn't it Tanto Meglio ?

"Um, that right, Kemosabe"

 

[jacco vermeulen]

https://www.youtube.com/watch?v=tb8vOFgtsmM

(makes Tonto and the Long Ranger a very manly thing)

 

[Bksabath]

"Um, that right, Kemosabe"

Vernacular Venician Lingo
Tanto Megio (gio read as Jo) = Much Beterer in unglish

Any problemo whit that and...
http://www.amazon.co.uk/Litre-Castor...rds=castor+oil

 

[Touister]

Is it possible to bridge a double mono F5, following such diagram:
Bridged and paralleled amplifiers - Wikipedia, the free encyclopedia

?

 

[Zen Mod]

it is

though , better to make EUVL's F5X

or , in case you need more ooomph , BA3 Balanced

 

[jacco vermeulen]

You'll even have Papa's blessing

 

[Zen Mod]

ya talking to me .......

ya talking to me ?

 

[AndrewT]

Is it possible to bridge a double mono F5, following such diagram:
Bridged and paralleled amplifiers - Wikipedia, the free encyclopedia

?

"Bridging" is a cheap and dirty way to blow up cheap and dirty car amplifiers.

Bridging is rarely needed in domestic audio.
Public Address and such require enormous power and here bridging properly applied can allow safer voltages to be used.

In domestic audio, a similar effect (more power from very low supply rails and better PSRR) can be had by going to a "balanced" topology inside the Power Amplifier.

Both the F5X and some options of the F5t can show the benefits of "balanced".

Now I will go further than "Bridging is rarely needed in domestic audio". Bridging is the wrong topology in domestic audio, it brings no benefits to the amplifier performance.

 

[Touister]

Thanks for your answer. Ok got the point.

My idea was, I am currently building a F5. In the future I may need a bit more power. So I was thinking was not build a second F5 and bridge them.

 

[micha b]

Since I have to build a few F5 for my friends, I decided to make
my own pcb layout.

Could anyone please check if there are any mistakes in it?




I'm a little bit unsure if the FETs are connected the right way...
Do you have any other suggestions on optimizing the layout?
Copper will be 70µm, gold plated.

Thank you in advance 🙂

Michael

 

[Sangram]

Hi Micha

Something looks a little funny with your BCxxx orientation.

No P3? Any specific reason? In the same way, the thermistor wiring looks like it is not from the final F5 schematic, though it works fine when used like that.

And finally,your gate traces look unduly long. The gate resistor should be as close to the physical pin as possible. Few mm max. You can consider using SMD to get it super-close.

 

[stijn001]

I asked this question in the F5 thread before, but recieved no answer. If I had a choice between a high efficient (97dB) wide band driver unit with the same spec in 8 or 16Ohm. Which one would you prefere, would 16Ohm pose a problem for the F5?

 

[sekess]

amp power requirements

Hey Andrew,
Is there an accurate method of measuring the power being used (at the amp outputs) while listening to a loud passage? This way, you would know what power you are actually using during actual listening. Then, you can get a handle on how much power you really need.

Thanks