100W Ultimate Fidelity Amplifier

[Hadighorbani]

thanks

 

[thimios]

ax11

Welcome..... Here's the file.

Regards,

Hi wiljj78 .
Have you this protection file in pdf?
Thanks
regards.

 

[joeyt]

what is the size of wire of inductor coil used in ax11 psu?

 

[AndrewT]

Choose anywhere from 1mm to 3mm diameter enameled copper wire.

 

[joeyt]

thank you andrewt

 

[wiljj78]

Hi wiljj78 .
Have you this protection file in pdf?
Thanks
regards.

Here it is in PDF files....

 

[ridelperez34]

Hi mr mile i built ur ax14 but i have a 7volts dc offset. Ive used c3281 and a1302 the drivers are c2073 amd a940. Previously.ive used kse350 n kse340 replaced it with mse still same dc.offset. i also rrplaced q1,q2 n q3 still same dc offset. Please help. Thanks

 

[jaagut]

Hi mr mile i built ur ax14 but i have a 7volts dc offset. Ive used c3281 and a1302 the drivers are c2073 amd a940. Previously.ive used kse350 n kse340 replaced it with mse still same dc.offset. i also rrplaced q1,q2 n q3 still same dc offset. Please help. Thanks

try to probe the correct pins of your transistors. pins should match the pcb layout. i experienced this dc offset when my transistor has different pins specs than the pcb layout.

goodluck.

 

[jaagut]

what is the size of wire of inductor coil used in ax11 psu?

http://www.arrl.org/files/file/Technology/tis/info/pdf/9708033.pdf

hope this helps.

 

[ridelperez34]

try to probe the correct pins of your transistors. pins should match the pcb layout. i experienced this dc offset when my transistor has different pins specs than the pcb layout.

goodluck.

I already tried rotating 180 the mses. I also checked that the transistors match pcb layout.

I'll check it again. Thanks

 

[jaagut]

I already tried rotating 180 the mses. I also checked that the transistors match pcb layout.

I'll check it again. Thanks

if there is fault on the circuit, some transistors can be destroyed during testing without the evidence of physical burns. remove them from board and test it again with multimeter.

 

[borys]

I made some small changes to ax11 amp - as sansui au217 amplifier (preaty same amp) and have smmall question - can the input buffer be bypassed and input pair be substituted with 2sk170 tranies ?
I have made some simulations and amp is preatty quick and looks stable.

The square is 20kHz
THX

 

[joeyt]

ready for testing

 

[jaagut]

ready for testing

nice build and heatsink!

 

[squatt3r]

ang galing!

 

[joeyt]

can i have the voltages measurement of ax-11? my ax 11 have a 5v in amp out without the output transistor.

 

[jaagut]

can i have the voltages measurement of ax-11? my ax 11 have a 5v in amp out without the output transistor.

usually this happens when signal ground is not connected to PSU ground.
normal reading of DC offset should be lower than +/-50 millivolts.

edit: output trans must be installed.

 

[joeyt]

i insert a wrong transistor replacement for bd139, hope this is only the problem

joeyt,

 

[ridelperez34]

Hi already replaced all the bcs and 5401 transistor but still have 7volts dc offset. Pls help

 

[overall feedback]

Hi already replaced all the bcs and 5401 transistor but still have 7volts dc offset. Pls help

Give us schematic with voltages on resistors