Good Day Sir Apex and Kandimba....
I am happy to report that my second channel is working now as advertise. Sound is clear and crisp....I have stereo setup now waiting to be installed in case. I just have to check my PSU today, then I am ready.
Thanks Sir Apex for circuit and Thanks Kandimba for PCB.
I made a new board as the one I was using, under microscope, tracks had holes and board was just bad made. Both channels work now as advertise. see pics....
I set my bias current at 30mA. Is this fine?
Thanks a lot for your help.
Regards,
macd
Nice work Macd, the bias current is ok
sorry bro I'm in Puerto Rico maybe the local time for the more experience guys are sleeping xD try later if you mean bias is too easy just measure voltage across any emitter resistor and adjust to 23.5mV to 26mV offset is low I measure one of mine and it was 15mV of offset that is pretty good for me that was a long time ago
if you mean bias is too easy just measure voltage across any emitter resistor and adjust to 23.5mV to 26mV offset is low I measure one of mine and it was 15mV of offset that is pretty good for me that was a long time ago Attachments
ax14 probelm in high frequency
hi apex sir i made this amp ax14 from 253 layout it works but in high frequency it is not good .i do everything what i can.i use first 100pf then change to 22 pf and 33 pf in place of 47 pf but nothing works.amplifier is not good in hf driver .sshh sound coming along some place where is high frequency instrument.please help i made so much pcb already.amp is running with 2 pair and 40 +- dc rail voltage . i change biasing no different.please help.
hi apex sir i made this amp ax14 from 253 layout it works but in high frequency it is not good .i do everything what i can.i use first 100pf then change to 22 pf and 33 pf in place of 47 pf but nothing works.amplifier is not good in hf driver .sshh sound coming along some place where is high frequency instrument.please help i made so much pcb already.amp is running with 2 pair and 40 +- dc rail voltage . i change biasing no different.please help.
Attachments
Sir Juan solved the problem.he is really good person
Thanks to everyone i used transformer 30 0 30 with good caps. Yes i put already 10r resistance to input negative. My hf is good on other amplifier. Problem in circuit i think no one test ax14 on hf driver .layout and other things goods sound is coming with good pressure when raised 15 k hz fader it make distortion.