100W Ultimate Fidelity Amplifier

[Rns audio box]

sir apex how to bridge this circuit pls..............
http://www.diyaudio.com/forums/attachment.php?attachmentid=206185&stc=1&d=1295513139

thanks.

 

[apexaudio]

sir apex how to bridge this circuit pls..............
http://www.diyaudio.com/forums/attachment.php?attachmentid=206185&stc=1&d=1295513139

thanks.

Why do you want to bridge Hi-Fi amp? Load can be only 8R in bridge mode.

 

[Rns audio box]

Why do you want to bridge Hi-Fi amp? Load can be only 8R in bridge mode.

so that sound be come louder in bridge mode. yes i put in 8R

pls..

 

[jef9200]

Here i'm again...
The two channels are working fine. Bias at 1,3V (best for my taste). Box is not finished but in good way.
Regulated psu 40V 4X10000uF for each channel.
2X120VA Transfo.
Good Bass.
Offsets: 3mv and 5mv. Need absolutly the wiring from Apex.

 

[apexaudio]

Here i'm again...
The two channels are working fine. Bias at 1,3V (best for my taste). Box is not finished but in good way.
Regulated psu 40V 4X10000uF for each channel.
2X120VA Transfo.
Good Bass.
Offsets: 3mv and 5mv. Need absolutly the wiring from Apex.

Nice work, thanks for the pictures. I suggest to use metal case. What is rail voltage?
Regards

 

[wattaniya]

which speaker protection you use .pls post the pcb layout.

 

[apexaudio]

which speaker protection you use .pls post the pcb layout.

In post #470 U can find very good stereo speaker protection.

 

[jorjbg]

Hi Apex Again!

This is my pcb, but im not sure for true montage of tranzistors? Can you help me ?
Sorry for my bad english.

 

[apexaudio]

Hi Apex Again!

This is my pcb, but im not sure for true montage of tranzistors? Can you help me ?
Sorry for my bad english.

You made miror reverted pcb, you must revert transistors pins, drivers and outputs you can montage on botom side of pcb.
Regards

 

[jorjbg]

Tnx for reply! And i revert my electrolit capacitors ?

 

[apexaudio]

Jef, do you set +/-40V on PSU?

 

[jef9200]

Transfo 2X30 AC (2X33V with 240V) , 45 DC regulated to 40V .
Too much projects for metal case, but i'll use a métal cover.
Heatsinks are warm but it's ok.
AX14 is giving very low bass. (my woofers can give 30HZ and i "feel" the bass in my body.

 

[apexaudio]

Transfo 2X30 AC (2X33V with 240V) , 45 DC regulated to 40V .
Too much projects for metal case, but i'll use a métal cover.
Heatsinks are warm but it's ok.
AX14 is giving very low bass. (my woofers can give 30HZ and i "feel" the bass in my body.

You have only 120VA transformers but PSU with 4X10000uF regulated on +/-40V there is no any rail voltage drop, and You have very low (good) bass.

 

[apexaudio]

Tnx for reply! And i revert my electrolit capacitors ?

No, polarity of electrolit capacitors and diodes are OK.

 

[apexaudio]

NX-14 made by 'nikko'

 

[apexaudio]

I must suggest to use NX14V2 pcb. This pcb is fixed on heatsink, and you soldering outputs on coper side of pcb. Montage outputs is much easy this way, and connection pcb on heatsink is much stronger, not just transistors pins.

 

[viki_v2]

HI Apex.
All the search for input selectors with volume control and remote controlled, has been very messy, Requiring atmel programming skills. Some thing new for me which i have not ever done.
Sir, can you suggest any thing which would help me with at least 4 pair of inputs and 1 direct input which could be switched with potentiometers. I cant use dact switchers, too costly.

or if any thing which can help me with remote controlled input selector and volume control.

 

[wakwakni]

hi apex, can you please tell me which amplifier u had can be use on my transformer 2x 30vac another is 2x 24vac?

 

[wakwakni]

hi sir apex, i would like to use your amp design in my new project. i can u please tell me sir, which amp (your design) can i use for this old transformer rated 2x 30vac together with 2x 24vac.

regards.

 

[samlo]

Hi, apex i am from india and want to build ax14 because i am beginner in audio amp
building and this is a good (not complex) design for beginners. kindly give me some
links of your amp designs.
i have posted my query about pioneer sx 3800 (Thread- Help! pioneer sx3800),but
nobody is replying my post. kindly open this thread and reply ,if possible.
thanks in advance. sorry for bad english.