F4 power amplifier

[sklimek]

Also, maybe with so many people buying F4 PCBs there can be a group by of the R-Theta heatsinks again?

Hi, I believe diy member grataku has two of the r-theta 11" X 11" heatsinks from the old PD group buy available, I talked to him last week. Here is a link for you to email him if curious.

http://www.diyaudio.com/forums/showthread.php?postid=772853#post772853

Stan

 

[mpmarino]

Mr Mod

On this lousy schematic you made, have you built and tried it or just talked about it


well..

Hows about takin NP's Rev0 and gettin rid of the 240/9240 for 610/9610 > for a set of compression drivers - or would they explode

You mentioned 540/9540 before, but that's not stupid enough....
and I'd have to buy them
and I'm dreadfully cheap


bahhh forget it. They'd blow right up Better with just 1 pair on output a la mini I guess..... a perfect match 1 is

 

[Zen Mod]

Mr Mod

On this lousy schematic you made, have you built and tried it or just talked about it


well..

Hows about takin NP's Rev0 and gettin rid of the 240/9240 for 610/9610 > for a set of compression drivers - or would they explode

You mentioned 540/9540 before, but that's not stupid enough....
and I'd have to buy them
and I'm dreadfully cheap


bahhh forget it. They'd blow right up Better with just 1 pair on output a la mini I guess..... a perfect match 1 is

you can use 610/9610 for that

go with lower voltage too,say +/- 15 volts and keep current in range of 350-500mA

that will be ~ 8W per mosfet,16 per channel and that's easy to coolllllllllllll

hey- I didn't build that ; why should I .....I know it works

 

[angchuck]

Hi everyone,

Some parts questions:

1)Can i use 0.125W resistors for the circuit other than the 3w .47r's;

2)Is the 1n4736 same as the 2n4736? Can't seem to find the 2n4736 locally.

Thanks

Chuck

 

[Zen Mod]

Hi everyone,

Some parts questions:

1)Can i use 0.125W resistors for the circuit other than the 3w .47r's;

2)Is the 1n4736 same as the 2n4736? Can't seem to find the 2n4736 locally.

Thanks

Chuck

1n is always dreky diode,whatever that means

2n is always dreky transistor,whatever that means

hehe- and whoever wrote that

just use any 6V8 zener

 

[mpmarino]

that will be ~ 8W per mosfet,16 per channel and that's easy to coolll.....

Use just a pair per channel of 610/9....?? Why not toss a couple more at it? The capacity-ance would still be dirt???

hey- I didn't build that ; why should I .....I know it works

bla bla blaaaa

 

[Zen Mod]

Use just a pair per channel of 610/9....?? Why not toss a couple more at it? The capacity-ance would still be dirt???





bla bla blaaaa

ya wanna feed tweets or massage chair ?

I told you that you need all of finesse you can get

what preamp you have? mebbe you can use just xformers between preamp and tweets........

 

[mpmarino]

ya wanna feed tweets or massage chair ?

both.

I told you that you need all of finesse you can get

OK, I'll go buy a case of shampoo.




point taken.

 

[Manu]

OK, I'll go buy a case of shampoo.

Why don't you try a bottle of wine? A bit harder to drill, I grant you, but the content taste much better (ask Vix).

 

[Zen Mod]

Why don't you try a bottle of wine? A bit harder to drill, I grant you, but the content taste much better (ask Vix).

naah- it's easy

 

[mpmarino]

What if we take Mr. Mod 's crippled F4 as above (no, not the corkscrew) with 610/9610 outputs and did this PSU. Yes, I know it's a completely stolen Nelson schematic that was destroyed by myself. I wanna put that finesse amp together for the 902s. I'll gall it my shampoo amp. Will it blow up?

Mr Mod ?

 

[Zen Mod]

What if we take Mr. Mod 's crippled F4 as above (no, not the corkscrew) with 610/9610 outputs and did this PSU. Yes, I know it's a completely stolen Nelson schematic that was destroyed by myself. I wanna put that finesse amp together for the 902s. I'll gall it my shampoo amp. Will it blow up?

Mr Mod ?

you can ditch one zero of all caps you drew,if you stay in ballpark of ,say 350mA Iq per channel.

or- you can use just those 30.000 and ditch everything after

your choice- I think that you'll hardly hear difference,at least on these lousy squakers

 

[mpmarino]

Should I ditch the first or last zero?

 

[Zen Mod]

Should I ditch the first or last zero?

dunno........

in second thought......it's better to ditch all 3-s in first and all 6-s in last bank

 

[mpmarino]

dunno........

in second thought......it's better to ditch all 3-s in first and all 6-s in last bank

Got it! Thanks!

 

[lykkedk]

I am in for designing my own pcb's to fit my need's.

I have tried to mockup a output board, for IRFP240 / IRFP9240, which fit my heatsinks perfectly... Only difference is how the Zener diode must be turned. The mosfets are soldered under the Cu traces, and the gate, source resistor and zener-diode are ofcause soldered on the component side of the pcb's (Witch i had to make 8 pcs. of for 2mono block's)

Any comment's and suggested modifications are very welcome !

Jesper

 

[steenoe]

Jesper, you might want to make the tracks as wide as possible.
Especially the Source and Drain tracks would benefit from a bit wider tracks.

Steen

 

[cviller]

I am in for designing my own pcb's to fit my need's.

Any comment's and suggested modifications are very welcome !

Do you plan any thermal coupling between the N and P mosfet banks?

I think that would be wise in terms of dc stability.

 

[lykkedk]

Thank's i will make the traces as wide as possible.

For the thermal coupling i don't know, i don't think it's possibly with my heatsinks...
I will use 1 heatsink for the irfp240 and another for irfp9240, btw.

I havent really thought about that

 

[cviller]

Do you already have your chassis designed and built? Otherwise you could place the N and P heatsinks together or connect them with some iron. I don't think you should be too concerned though, if it becomes a problem you can just fix it later.