100W Ultimate Fidelity Amplifier

[AndrewT]

Saw a diamond slicing machine in Amsterdam.
The bronze wheel can only be about 10thou thick. And that's after they have coated it with diamond grit.

Now how close could we make PCBs with a slicer made like that?

 

[apexaudio]

hi apex sir,
i connect the vu meter to ax14, the three lights permanently on. why is that.
supply voltage to the amp 50-0-50vdc.
here are some images.

Is this your PCB, there is another version with -HV suply.

 

[wattaniya]

yes ,this is the one.

 

[apexaudio]

yes ,this is the one.

Try VU without conections to amp out

 

[wattaniya]

amp is working fine, but the vu meter lights on.
here is the pcb image.

 

[apexaudio]

amp is working fine, but the vu meter lights on.
here is the pcb image.

Measure voltages on transistors pins and post values.

 

[wattaniya]

ok sir, now i am out for my job, when i return home, i will check.

 

[shravanth]

No that's not the problem, connect input GND to PSU GND and offset will be about +/-10mV.

i got it sir its working thakn u sir. . .
can u post good bass treble circuit for AX-14

 

[shravanth]

hello friends
how many watts i can get if i use 35-0-35VAC 5amps 250va transformer

 

[wattaniya]

hi apex sir,
in this schematic bc550 used instead bc560. is this correct?

 

[AndrewT]

hello friends
how many watts i can get if i use 35-0-35VAC 5amps 250va transformer

Have you read any, or some of the posts linking amplifier maximum output voltage to amplifier supply voltage?
If not, then go a read !

 

[wattaniya]

hi apex sir,
i remove all transistors and checked ,the transistors are good.
click the image to see large view, to see transistor numbers.

 

[apexaudio]

hi apex sir,
in this schematic bc550 used instead bc560. is this correct?

This cicuit work with any NPN transistor similar to BC550, BC560 is PNP and can't be used instead BC550.

 

[apexaudio]

hi apex sir,
i remove all transistors and checked ,the transistors are good.
click the image to see large view, to see transistor numbers.

I need information about voltages on transistors pins in cicuit with suply.

 

[shravanth]

hello frineds AX-14 is working but i am getting noise in the music

 

[shravanth]

Is this your PCB, there is another version with -HV suply.

hello nazirdigi can u share VU meter layout plz

 

[wiljj78]

hello frineds AX-14 is working but i am getting noise in the music

Hi Sharavanth,

You need to post pictures as Apex said and measurement, if possible with wiring connection, otherwise unable to comment without posting your work, However see attached picture for correction, hope this will help.

Regards,

 

[shravanth]

what caps i need to use there
i have changed 33ohm to .33ohm amp is working but voice is not clear

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

 

[apexaudio]

what caps i need to use there
i have changed 33ohm to .33ohm amp is working but voice is not clear



What is bias current and dc offset on your amp?

 

[smartx21]

You could update your photo!