100W Ultimate Fidelity Amplifier

[Bhushan]

APEX A40

Here is my APEX A40

 

[I love the sound]

Here is my APEX A40

View attachment 613102

View attachment 613103

Very nice. Net us how its sound.

 

[I love the sound]

Try protect without short circuit detect (remove 10k resistor)...

I remove the 10k resistor but the problem persist. What else can I do? thanks.

 

[Hadighorbani]

apex ne555 protection

Hi dears
is this two protection correct and work ?

 

[kalasbutodrummer]

How to use the apex source direct switch by the way SRC/DRC Stands for? Thanks

Thank you Prasi you save me. I work two days on that pcb but nothig good. I don`t have so much talent. You pcb looks great.

Do you can make a copy of these pcb`s if you have some time free?

Thanks in advance!

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[alex mm]

Here is my APEX A40

View attachment 613102

View attachment 613103

Nice, again my layout ......😀

 

[Bhushan]

Very nice. Net us how its sound.

Well it sounds outstanding... Love the sound

https://youtu.be/wChAKhl-kAI

 

[Rahulradionics]

Hi dears
is this two protection correct and work ?

dear friend,
what is the use of NTC 10K? where is it fix? power amplifier's heat sink ?

 

[I love the sound]

dear friend,
what is the use of NTC 10K? where is it fix? power amplifier's heat sink ?

Yes the NTC 10K need to mount on amplifier's heat skin.

 

[eremey]

question

P30ZF preamplifier ...... ready for testing !
Regards,Alex

Hi. The scheme is rabotchy? It is possible to look at PCB? There, in the first edition, paths were passed. Tell about setup of this unit... I had problems with the last cascade of strengthening...

 

[apexaudio]

AA9 tested

 

[prasi]

AA9 tested

looks like layout is similar to mine, is it possible to confirm?

 

[prasi]

Retro Bootstrap Amp

layout. can TIP142/147 be used possibly with reduction in supply voltage? any other resistor value needs change with lower voltage?

 

[apexaudio]

layout. can TIP142/147 be used possibly with reduction in supply voltage? any other resistor value needs change with lower voltage?

Nice work, no change for +/-40V rails, can you add 47nF in rails, thank you.
Regards

 

[I love the sound]

Hi sir Mile i have a question. What needs to be changed to get signal out about 850mv-900mv? My amp for subwoofer is need 850mv signal to get all the power of amplifier. I don't want to make a preamplifier for this, i want to use only this subwoofer filter. Thanks in advance!

An externally hosted image should be here but it was not working when we last tested it.

 

[prasi]

Nice work, no change for +/-40V rails, can you add 47nF in rails, thank you.
Regards

Added. So power will be ~80W in 8 ohm with 40V supply?
reg
Prasi

 

[apexaudio]

Added. So power will be ~80W in 8 ohm with 40V supply?
reg
Prasi

With bootstrap you can get rail to rail peak voltage on speaker... power will be 90W/8R with +/-40V supply. Without bootstrap there will be about 75W/8R.
Regards

 

[AndrewT]

only if the PSU is holding @ +-40Vdc while delivering full power.
If the PSU has sagged to 40Vdc then the quiescent will be much higher, probably around 45Vdc.

Starting with a quiescent PSU @ +-40Vdc I would expect around 65W to 70W into 8r0 from a really good amplifier built to deliver lots of current.

 

[44250]

A38 (A40 with two pairs of output transistors in the output) in progress :

 

[apexaudio]

Hi sir Mile i have a question. What needs to be changed to get signal out about 850mv-900mv? My amp for subwoofer is need 850mv signal to get all the power of amplifier. I don't want to make a preamplifier for this, i want to use only this subwoofer filter. Thanks in advance!

XL2 is subwoofer filter with gain, output is 1,5V.
Regards