First Watt F1 with 30W output power

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Jump to Latest
Netlist

Netlist

Moderator
Joined 2003
Paid Member
As the F1 is intended to use with very high efficiency loudspeakers in the range of +90dB/watt, cranking up the volume to as high as 8 watts will result in 99dB of headroom. Perhaps there’s a way to make the amp deliver more power but I presume we will deviate from the original idea of simplicity and thus will be penalized soundwise. The F1 was designed to work only well with a limited amount of speakers, being high efficiency and full range as their most important parameters.
Not wanting to temper your enthusiasm, could you tell us what speakers you have in mind?

/Hugo
 
A

altor

Member
Joined 2003
altor.co
Adams_Leo said:
I have buit SOZ with 10w output power,the sounds very nice and nature.I plan to build the F1 power amplifier with 30W output. Anybody can help me modify the schematic with 30W power outpu?thanks in advice

Per Nelson's request not to publish schematics but rather link to his site I removed the picture and added the link to the manual

/Netlist
Click to expand...

Adams_Leo, the input power of the 1st_w is 100W/one ch. - i.e efficiency=10% (@ 8 Ohm load).
If you built 30W you need 300W per channel, you are ready ? :)

If yes, you should increase the voltage from 24v up to 45-50v, and increase the current (decreasing R27 & R28)
 
jh6you

jh6you

Disabled Account
Joined 2002
Adams

High power F1 . . . ?

If we have a wild horse, who has a good potential character but is too sensitive, nervous in a way and afraid of tough control, we might need a horseman to lightly stroke and calm her down. Then, we could manage to get her shining character. If we have a speaker behaving like the wild horse, we might need F1 as the horseman—i.e. the current source amp of the first watt.

As far as I understand, Nelson likes F1 just for such first watt . . .

Good luck and Regards
jH
 
A

Adams_Leo

Member
Joined 2003
Re: Re: First Watt F1 with 30W output power

Tweeker said:
I think ~20watts would be possible without resorting to more devices with oodles of cooling and flogging it hard.:hot: Reliability would suffer, burning FETs is one thing, just dont burn any fancy drivers. :bawling:

F1 in qualifying trim?
Click to expand...
yeah,I think 20W power output would be better.

altor said:


Adams_Leo, the input power of the 1st_w is 100W/one ch. - i.e efficiency=10% (@ 8 Ohm load).
If you built 30W you need 300W per channel, you are ready ? :)

If yes, you should increase the voltage from 24v up to 45-50v, and increase the current (decreasing R27 & R28)
Click to expand...


altor,thanks,I will try it.I have purchased the heatsink for this.
 
A

Adams_Leo

Member
Joined 2003
jh6you said:
Adams

High power F1 . . . ?

If we have a wild horse, who has a good potential character but is too sensitive, nervous in a way and afraid of tough control, we might need a horseman to lightly stroke and calm her down. Then, we could manage to get her shining character. If we have a speaker behaving like the wild horse, we might need F1 as the horseman—i.e. the current source amp of the first watt.

As far as I understand, Nelson likes F1 just for such first watt . . .

Good luck and Regards
jH
Click to expand...

I use SOZ with 10w power output driver Harbeth P3,the sounds very good.now I plan to use F1 with 20~30w output to driver Dynaudio counter 1.3 SE.
 
john-china

john-china

Member
Joined 2001
had anyone ever used these ISOTOP mosfets

how about them.

if i use normal mosfet , for instance irfp140, as gain device , and use big packet mosfet as cascode device , so can i make huge
power class-A single ended amplifier?


if it is feasible , how is the sound quality ? and i think i can use single mosfet to build powerful single ended amplifier.
 
Nelson Pass

Nelson Pass

The one and only
Joined 2001
Paid Member
Re: had anyone ever used these ISOTOP mosfets

john-china said:
if i use normal mosfet , for instance irfp140, as gain device , and use big packet mosfet as cascode device , so can i make huge power class-A single ended amplifier?
Click to expand...

Either that or some parallel devices for the cascode and current
sources, and you can make it quite big if you want. As a practical
matter, probably about a 10 amp output peak. I would expect
quite good performance.
 
A

Adams_Leo

Member
Joined 2003
Re: Re: had anyone ever used these ISOTOP mosfets

Nelson Pass said:


Either that or some parallel devices for the cascode and current
sources, and you can make it quite big if you want. As a practical
matter, probably about a 10 amp output peak. I would expect
quite good performance.
Click to expand...

I want to use IRF140 to replace the IRFP9240&IRF240,does it can work well?
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Top Bottom