F4 power amplifier

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mpmarino

mpmarino

Member
Joined 2004
Hey Guys - I've got a F4 question.

What preamp should I use?
-just kidding-:clown:

The F4 has ~+-23v as we know. I was going to use irfp140/9140 outputs. simple 'nuff, but here's the quandary - and my ignorance is shining here;) I've decided to bridge them. Does this mean that the outputs will see twice the +-23v across them in the bridged configuration?

The 140 is a 100v fet, so you can see my concern...


Thanks!
 
chrismercurio

chrismercurio

Member
Joined 2006
A question for Nelson,

Mr Pass,

I know you did a fair bit of research into which commercial preamplifiers would work well where voltage is concerned with the F4. Can you possibly provide a list of the balanced operation preamps that work well in terms of votage output?

Thanks very much for the consideration,

C
 
mpmarino

mpmarino

Member
Joined 2004
mpmarino said:
Hey Guys - I've got a F4 question.


The F4 has ~+-23v as we know. I was going to use irfp140/9140 outputs. simple 'nuff, but here's the quandary - and my ignorance is shining here;) I've decided to bridge them. Does this mean that the outputs will see twice the +-23v across them in the bridged configuration?

The 140 is a 100v fet, so you can see my concern...


Thanks!
Click to expand...

Seriously,

I know I'm a greedy boy and all that ... but ...

I'm not sure about this - will the 100v irfp140 / 9140 see the full swing of both amps in bridged config. I'm thinking that it will still see only +-23v but I'm not 100% sure :smash:

Please?? I'll give you a cookie :)
 
R-K Rønningstad

R-K Rønningstad

Member
Joined 2006
Peter Daniel said:
In bridged config. the output devices will see exactly same voltage (+/-23V)
Click to expand...


The concept is shown in the attached picture.
When the upper amp swings towards +23 V, the lower swings towards the -23 V rail, putting all that voltage (46 V) over the loudspeaker.
NB! Dynamic loudspeakers and magnetic pick-ups (moving coils for example) are born symmetrical.

RK
 

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Zen Mod

Zen Mod

Official Court Jester
Joined 2003
zenmod.in.rs/
Paid Member
Variac said:
Yup, if you wanna hear Lil' Punkin' pre with the mighty F4's then the West coast USA BURNING AMP is the place to do it.. Oct 20, 2007

Variac
Click to expand...


salas said:
This thread produces serious circuits through comedy.:smash: I LIKE :D :D :D :D
Click to expand...


naah........

I just decided to make :Pumpkin: as an amp ;
probably F4 will not be suitable for any preamp duties in that case , even if his size will be adequate

:Pumpkin: will have 73 killos (each channel) , just as any decent vegetable from my area

all that for 15W/600E (doubling power all along to 2 ohms , where it will be current limited) ;

fussnote name for it can be DoKxxxMkxaCDoBT (Death of KrellxxxMkx and Certainly Death of Blow Toarch)



:devilr:
 
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