CFH7 Amp

[xrk971]

Just a little correction, I know where the orig. schematics comes from.
The one posted at the first post was simplified (or modified) by me 2 decades a go, actually that was drawn by me! 🙂
I built different variant of these amp (some other DIT-ers to) over the years just to clear.
The last variation with different semiconductors and some tweak was far the best sounding amp I ever built..
Yes it had some thermal drift issue...
Will be back to these project before the end of these year.. I was unable to deal with because of my health issue but thank God getting better day by day..
I do not claim I am a top electronic guy or a guru but I learned a few thinks over the years....😀😀 thanks to all...
I think we hear to learn from each other at least some of us.
I do want to follow the thread....and I am happy if people benefit from my posts.🙂
Greetings

Great to hear from you and good to know that schematic is your own. Get well soon!

 

[xrk971]

BOM for CFH7 Idefixes v1

Here is the BOM for the board that I built.

 

[xrk971]

Thanks Andrew for finding mistake.
Your correction will also not work properly because I have made mistake on tracks connecting collector and emitter of BD139.

Sprint file with correction.

Hi Sonal,
Can you please provide the Gerbers for this layout? It's a beautiful layout worth making into a board. If not too much trouble, can you please add a 2.2k between the 10uF input cap and the input to the base of the BC556/546 transistors (this was the correction needed for proper RF suppression).
Thanks,
X

 

[hajj]

Hi Sonal,
Can you please provide the Gerbers for this layout? It's a beautiful layout worth making into a board.

I second that idea! 🙂

 

[Idefixes]

Hi X,

as you are living with sevrel of latest design....wich would go for between Quasi_nmos and CFH7?

I have this latest CFH7 layout try by side. No more hole issue.....

Marc

 

[xrk971]

Hi X,

as you are living with sevrel of latest design....wich would go for between Quasi_nmos and CFH7?

I have this latest CFH7 layout try by side. No more hole issue.....

Marc

They are both on my top 4 list so hard to say. The CFH7 is technically lower distortion and very clean and direct - good for more critical monitoring uses. The quasi is more "musical" and great for enjoyment. Both have great bass impact and nice mids. It's a toss up. 😉

 

[Idefixes]

They are both on my top 4 list so hard to say. The CFH7 is technically lower distortion and very clean and direct - good for more critical monitoring uses. The quasi is more "musical" and great for enjoyment. Both have great bass impact and nice mids. It's a toss up. 😉

Thanks for report......even if don't help me to choose😀😀😀

Marc

 

[xrk971]

Thanks for report......even if don't help me to choose😀😀😀

Marc

Btw, thanks for the revised layout. Looks great.

 

[xrk971]

Great to hear from you and good to know that schematic is your own. Get well soon!

Hi Gaborbela,
How is the build coming along?

 

[thimios]

I second that idea! 🙂

Me too!

 

[sonal kunal]

Hi Sonal,
Can you please provide the Gerbers for this layout? It's a beautiful layout worth making into a board. If not too much trouble, can you please add a 2.2k between the 10uF input cap and the input to the base of the BC556/546 transistors (this was the correction needed for proper RF suppression).
Thanks,
X

Gerber files for CFH7, 2.2k added to input. I have increased base stopper value to what Terry used in his build.

I also completed CFH9 layout this weekend, sprint has all the version of CFH7 and CFH9.

 

[thimios]

Thanks!🙂

 

[xrk971]

Oh wow. CFH9!! 😀
Thanks Sonal!

 

[hajj]

Thanks for the gerbers Sonal!
So the CHF9 should handle twice as much current as the CHF7, right?

 

[Idefixes]

Hi sonal,

I think there some mistake on mosfet marking.....IRFP240 on negative rail and IRPF9240 on positive rail..... Rails connector spad and marking are wrong


Marc

 

[sonal kunal]

Hi sonal,

I think there some mistake on mosfet marking.....IRFP240 on negative rail and IRPF9240 on positive rail..... Rails connector spad and marking are wrong


Marc

Thanks Marc, I totally missed those errors.

Reposting corrected gerber files of CFH7.

Those who downloaded sprint lay file rotate 4700uF capacitor on CFH7 ver1.07, CFH9 ver1.01, CFH9 ver1.02 layout. Move +ve and -ve sign to correct tab.

 

[Idefixes]

If you allow me i will use your CFH9 layout with little changes for my single use....

Marc

 

[xrk971]

Please post revised CFH9 Gerbers. I want one!!! 🙂

 

[xrk971]

Thank you, Sonal ! When you have a moment please post CFH9 Gerber.

Thanks,
X

Beautiful layout! True artistry.

 

[Idefixes]

I did (for fun) some light changes in CFH9 top notch Sonal routing job

Marc