100W Ultimate Fidelity Amplifier

[sagnikoni]

Can I use 50k pots instead of 10k on TB3 ?
If not is there any option to tweak any other component for fitting 50k Pots.

Thanks in advance.

 

[mikel1998]

Hello ! First , thanks Alex MM and Apex for brilliant schemes and pcb.I managed to finish the P30+TB3 amplifier.

 

[Joel Wesseling]

TB-3 tone controls are fabulous!
I'm correcting the overall rising speaker response of small midbass driver. I'll try it with a pass full range eq. This driver still need cone break up attenuated!

My plan is to install it in an integrated amp along with Apex AX11 mini

 

[priyank]

Hi joe can i get pdf of this design that is including power supply , all required files so that i can make pcb for diy

 

[clpk]

Apex Mic, Line, EQ... Pré-amp https://www.diyaudio.com/community/threads/mic-line-eq-preamps.167363/

 

[priyank]

Thanks guys, if anyone decides to order pcbs, let me know I will buy off a couple.

HI need some pcb for home use how can i conncet with you

 

[sagnikoni]

Have anyone tried this VU meter ?
I want to DIY a VU Box like this. Which will have input and output selector.

Douk Audio VU3.

 

[Joel Wesseling]

Here is gerbers and schematic for REV 3 tone controls

 

[querce615]

Hi all,
referring to the REV3 scheme of #14,268 - I wanted to know about the 3 potentiometers (bass-mid-treble)
are they lin or log?

many thanks,
Marco.

 

[alain98]

Hi all,
I'm interested with the VAS push pull in AX11 schematic. May we adapt this concept for other topology like CFP (like P3A amp)?

 

[Joel Wesseling]

Hi all,
referring to the REV3 scheme of #14,268 - I wanted to know about the 3 potentiometers (bass-mid-treble)
are they lin or log?

many thanks,
Marco.

I'm using linear.

This one fits. I would like to find other options for 10k linear that will fit the pcb
https://www.digikey.ca/en/products/detail/bourns-inc/PDB182-K220K-103B/2564759

edit - BTW, the Bourns pot has a center detent. The response is basically flat at the detent. From my acoustic measurements it looks like
an approximate 6db cut and boost

 

[alain98]

Apex BJT STEREO PRE-AMP SB 3.1 2014 - 2020

Hi guys I got this new layout I decide to go back a re-done the BJT pre-amp now that I have more experience I'm gonna posted here please if some one see an error let me know I just make it today I attached the schematic I use on simulation



Apex BJT STEREO PRE-AMP SB 3.1



Note: is not tested yet

Hi all,
In this preamp Apex SB 3.1 do the transistors have to be paired for a best result?
I think XRK made it and was satisfied.

 

[AdeS]

Is it a black&white pcb for this simple amplifier?

A5 Pcb
https://www.diyaudio.com/community/...delity-amplifier.164093/page-417#post-4799034

A5 pcb components layout
https://www.diyaudio.com/community/...delity-amplifier.164093/page-424#post-4805473

 

[thimios]

Thanks my friend but i can't use this for home etching.
I need this without components placed.😉

 

[AdeS]

A5 PCB
I searched, I hope I found what you want.

 

[thimios]

Yes,that's it!
Thanks

 

[prasi]

but difficult to layout..

Somehow, I never revisited this design till now.
So here is a version of it, after a long long time.
regards
prasi

 

[thimios]

O my friend,you are a machine!!!
Diy audio have an excellent 👌 tool.
Name of this tool is prasi🙏

 

[thimios]

Looking at the schematic diagram,i can't see a Vbe multiplayer.
How this remain stable from thermal runaway?

 

[prasi]

i dont know thimios, Mr. Mile posted this as an idea. may be he can clarify or someone could sim it.