Hifisonix kx-Amplifier

[oloppolo]

I bought components in the official channels (Mouser - TME- RS). I make a last attempt and will buy KSA2690 and KSA1220 from Farnell.

 

[Bonsai]

Davide, print off a circuit diagram and write all the voltages on and post it up here. The circuit has the voltages you should be getting on it - if there are any differences hopefully we can debug it.

 

[oloppolo]

I installed onsemi 1220 and 2690.
Are R10 and R11 too high?
(mesurement in low mode)

 

[oloppolo]

R16 and R17 measure 415 mV.

BC546 and BC556 are B grade.
KSC3503 is D grade.
KSA1381 is E grade.

However with Onsemi KSA1220 KSC2690 it seems to me improved. BD139/140 weren't as good.

 

[Bonsai]

Oloppolo, your amp looks like it’s ok. R16 and R17 are a bit high, but I think you are ok to go. Output current is 463mA per pair which is ok.

You now need play some music through it and wire it up in its final configuration. If you have any hum problems, come back here or PM me to help to solve it.

 

[Bonsai]

Correction: I meant to say above the voltage drops across R16 and R17

 

[oloppolo]

I finally hear my Dynaudios singing.
Thank you Bonsai!

 

[Bonsai]

Fantastic!!!! Congrats and enjoy!

 

[Bonsai]

For those wanting to build a kx Amp, please go to this thread

New Hifisonix kx2-Amplifier

This is the updated and improved kx2 Amp 28 W class A, low distortion wide bandwidth CFA.