QUASI Amplifier for Beginners

[olafk]

Sorry for bad explanation

The Heatsink should be like the picture. The PCB will be mounted on the backplate of it and the heatsink will be mounted in the enclosure vertical like your intentions.

regards Olaf

 

[djk]

"for 6pair outputs what are the changes to make with 80vdc? "

Change BC546 to 2N5550
Change MJE15030/31 to 32/33
Change 2N3773 to MJ15024
The 22K that feeds the diode pair needs to be 5W, it can be 3W on ±65V
The 22K feedback resistor needs to be 1/2W, it can be 1/4W on ±65V

 

[wattaniya]

"for 6pair outputs what are the changes to make with 80vdc? "

Change BC546 to 2N5550
Change MJE15030/31 to 32/33
Change 2N3773 to MJ15024
The 22K that feeds the diode pair needs to be 5W, it can be 3W on ±65V
The 22K feedback resistor needs to be 1/2W, it can be 1/4W on ±65V

thanks djk for the reply.

 

[wattaniya]

apex vu pcb.

hi apex sir,
when i connect the vu meter to ax14 amp, the power light and 2nd and 3rd lights permanently on , why is that?

 

[gholami]

Hi

and it's size?

 

[bkby]

Thanks. Will post pictures, when I finish.

Waiting for you.

 

[olafk]

for the meantime...

...better PCB

regards, Olaf

 

[sanbadgujar]

Hi all if I wanted maximum 100W in to 8 oham load what should i have to change in this circuit and what will the supply requirement is 40-0-40 5A ac transformer is OK please replay

 

[Boscoe]

Hi all if I wanted maximum 100W in to 8 oham load what should i have to change in this circuit and what will the supply requirement is 40-0-40 5A ac transformer is OK please replay

Read the thread!!

 

[AndrewT]

40+40Vac gives 150W to 170W with a BJT output stage.
I'd expect 120W to 140W with a source follower mosFET output stage. Probably quite a bit more with a common source output stage.

 

[sanbadgujar]

Hi Andrew T is this amplifier is not good for bass or low frequency. when i read some viewer
replay i think that is it not HI FI amplifier if that is true i am disappointed

 

[AndrewT]

I have not built any of Apex's amplifiers.
But as with all amplifiers, the filters determine the passband.
The ability of the amplifier to pass current from PSU to speaker determines the sound at the speaker.

 

[sanbadgujar]

Hi Andrew T thanks for replay what should you suggest for me for up to 100 W in to 8 ohm
load which amplifier from diyaudio you suggest

 

[sanbadgujar]

HI Apexaudio is this amplifier is response good for low frequency signal i mean some people replaying on this tread that this amplifier is not HI FI amplifier please give me suggetion

 

[boyet0173]

...for the compact version - not tested.

regards

Hi olafk,

Can you share your pcb layout in pdf file using 2n2922? Thank you in advance.

regards,
Boyet

 

[olafk]

Hi olafk,

Can you share your pcb layout in pdf file using 2n2922? Thank you in advance.

regards,
Boyet

Hi,

i will upload the file tonight.

regards, Olaf

 

[44250]

Hi Andrew T is this amplifier is not good for bass or low frequency. when i read some viewer
replay i think that is it not HI FI amplifier if that is true i am disappointed

have you seen the title of this thread? "QUASI Amplifier for Beginners" ,what does it tell you? For hi-fi try nx14,sr50-100-200 or say f100 . I have found a lot in nx14,it is one of my top 3 amplifiers that i have built and heard.

 

[olafk]

Hi olafk,

Can you share your pcb layout in pdf file using 2n2922? Thank you in advance.

regards,
Boyet

Hi Boyet,

here are the files. Hope, you will have fun.
(Size is 110x85mm).

regards, Olaf

 

[boyet0173]

Hi Boyet,

here are the files. Hope, you will have fun.
(Size is 110x85mm).

regards, Olaf

Hi olafk,

Thank very much for your kindness. I want to try this to my subwoofer. Again thank you.

Regards,
Boyet

 

[joeyt]

what is the power output of this compact module using -40v 0v +40v?