100W Ultimate Fidelity Amplifier

[thor61]

What pcb's are used in your Ultimate Fidelity Amp ? It shows 2 for the amp, 1 for the psu and another ? That is very close to what I'm looking to build. Please list pcb's used ! Thank-you

 

[apexaudio]

What pcb's are used in your Ultimate Fidelity Amp ? It shows 2 for the amp, 1 for the psu and another ? That is very close to what I'm looking to build. Please list pcb's used ! Thank-you

You don't need to use this LED VU pcb for Hi-Fi amp,
Regards

 

[apexaudio]

I suggest you to use PSU from post #95, there is protect, clip leds...

 

[apexaudio]

Current thru differential is 600uA per transistor, and thru VAS is 6mA. 2SB817/2SD1047 can be used for AX14 amp.
Regards

 

[apexaudio]

Sanken 2SA1294/2SC3263 and 2SA1491/2SC3855 or 2SA1492/2SC3856 are good for AX14 also.

 

[apexaudio]

@ mihailo
In thread http://www.diyaudio.com/forums/solid-state/164208-500w-pa-amplifier-limiter-36.html I see yours pcb for A100, I like hear your comment here about sound and comparation betwin A100 and B500 when you finish A100,
Regards

 

[maouna]

hi apex ,i have finaly completed and tested my psu.everything works great.

THANKS.

this is a photo.


can you post pcb of the VU meter of post #182 ?

it connects directly to the output of the amplifier ?

it needs power supply?

 

[apexaudio]

VU meter use same power supply as amplifier, but only GND and negativ rail voltage,
Regards

 

[maouna]

can you post the pcb?

 

[mihailo]

Apex I have finished one channel, and my multimeter is showing 14.6V DC on output. Transistors were new, I have buy them today.
Just now saw your post about polarity of diode 1N4148, and reverse polarity but still I have 14V on output.
Can you help me to check are BDW trans. ok?
Don't know how to measure them, are they different in measuring from standard NPN,PNP?
Don't have much experience in electronics. I am student of Mechanical faculty University 3rd year, we learn only basic electronics.

 

[apexaudio]

Apex I have finished one channel, and my multimeter is showing 14.6V DC on output. Transistors were new, I have buy them today.
Just now saw your post about polarity of diode 1N4148, and reverse polarity but still I have 14V on output.
Can you help me to check are BDW trans. ok?
Don't know how to measure them, are they different in measuring from standard NPN,PNP?
Don't have much experience in electronics. I am student of Mechanical faculty University 3rd year, we learn only basic electronics.

You must connect input GND to PSU GND with separate wire (input GND and power GND are not conected on pcb), or use 10R in paralel with 100nF for test,
Regards

 

[opor]

Hi,
How to set bias?

 

[opor]

It is hard for me to get 2SC4793 and 2SA1837 . Are MJE15033 and MJE15032 good substitutions?

 

[apexaudio]

It is hard for me to get 2SC4793 and 2SA1837 . Are MJE15033 and MJE15032 good substitutions?

Yes, but many TO220 drivers can be use for AX14 like 2SA1306/2SC3298 or similar. For BIAS adjust put 10R resistors instead fuses and set 500mV on them,
Regards

 

[maouna]

apex, can you post the board layout for the led vu meter?

 

[apexaudio]

Fx14

Ultimate Fidelity with MOSFETs

 

[apexaudio]

Nx14

NMOS Ultimate Fidelity Amplifier, also work great...

 

[apexaudio]

apex, can you post the board layout for the led vu meter?

I will post in thread
http://www.diyaudio.com/forums/solid-state/167363-mic-line-eq-preamps-11.html
Regards

 

[apexaudio]

If you connect amplifier to PSU, you have DC offset on output becouse input GND must be connect to the PSU with separate wire. You can add 10R for test, and there will be not DC on output, but litle hum is posible.

 

[apexaudio]

Nx16

With overcurrent cut-out protect, and power increase up to 100W/8R...