100W Ultimate Fidelity Amplifier

[jofual]

dc offset

One cannot check or measure Output Offset when playing.
One measures Output Offset with open circuit output and closed circuit (shorted) input.

ok thanks sir..

 

[SERGIODS]

Many posts offtopic. Here is schematics again.

That magnificent amplifier
you are a teacher

 

[sam18]

What do you set the bias to?

 

[sam18]

And is this amp powerfull enough for a living room?

 

[SERGIODS]

Many posts offtopic. Here is schematics again.

measured as "PCBs" in mm (millimeters)

 

[masood]

dear sir
can any one explain me what is offset voltage?
thanks masood

 

[44250]

It is voltage between amplifier speaker out and GND.

 

[alex mm]

It is voltage between amplifier speaker out and GND.

with input shorted to ground

 

[jofual]

with input shorted to ground

How about to measure corect bias Sir..?

 

[apexaudio]

How about to measure corect bias Sir..?

Measure voltage on 0,22ohm resistor. I=U/R , 10mV on 0,22ohm is 45mA bias current across output transistors.

 

[jofual]

Measure voltage on 0,22ohm resistor. I=U/R , 10mV on 0,22ohm is 45mA bias current across output transistors.

Great.... Thanks Mr Mile.... this is very useful info...

 

[masood]

It is voltage between amplifier speaker out and GND.

dear sirs,(44250,ALEX MM)
thanks both of you for sending answer for my question.sorry for late reply.
regards with,masood

 

[trowa]

dear all diyers can someone help me there is no available mje340 and mje350 in or location can someone give me a substitute for the following transistor,,, sorry for my bad english good day to all

 

[apexaudio]

dear all diyers can someone help me there is no available mje340 and mje350 in or location can someone give me a substitute for the following transistor,,, sorry for my bad english good day to all

Use 2SB649 and 2SD669...

 

[trowa]

Use 2SB649 and 2SD669...

thanks you very much sir Miles i had a hard times finding mje340 and mje350,,, sorry for my bad english

 

[trowa]

Use 2SB649 and 2SD669...

Sir miles another question is that ok to use 2sd669 again because i already use it to replace the BD139 on your AX100 thanks regards to all

 

[apexaudio]

Sir miles another question is that ok to use 2sd669 again because i already use it to replace the BD139 on your AX100 thanks regards to all

It's OK, and you can use many other TO126 transistors in VAS

 

[masood]

dear sir ,
i have two question:-
1- how can i set bias by protecting mosfet safe.
2- i have a styroflex type of capacitor indicated as 10000 , 5% , 250 volt how can i know the capacitor value in micro farad , kilo farad ,and nico farad thanks

thanks regards

 

[trowa]

It's OK, and you can use many other TO126 transistors in VAS

sir apex can the AX100 work in 24V rail voltage? thanks sorry for my bad english regards to all

 

[apexaudio]

sir apex can the AX100 work in 24V rail voltage? thanks sorry for my bad english regards to all

AX100 will work with 2x24V rail voltage and than you can use BD139/BD140 instead MJE340/MJE350.