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Old 25th November 2011, 03:02 PM   #6941
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Default So, it seems that everything is fine now

Bias adjusting, off set adjusting, amplifier playing...seems you succeed... congratulations.

regards,

Carlos
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Old 25th November 2011, 03:18 PM   #6942
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now i test and adjust the offset on output terminal and it reads. 1.0 and my multimeter was set to 200mV. i think this is ok. any opinions?

i have a hard time in tweaking the bias (VR3), the values in my Meter continue to increase. i leave it about 600mV and now it reads 636mV. are there any problem or is this normal? the amp is almost 30mins powered on.
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Old 25th November 2011, 03:20 PM   #6943
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Thank you so much Sir Carlos. :]
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Old 25th November 2011, 04:55 PM   #6944
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its working but it hums. and there is speaker pop when turning on and off. maybe i will try DX MKII or MKIII. good night folks. hope i will fix this amp next week.
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Old 25th November 2011, 06:11 PM   #6945
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Default Hum can be your supply filtering... or bad input coaxial cable

or because you are using MP3/4 player in the input.

There's no registered complains about hum in this amplifier...you are the first to report this.

Power on thump is normal in this amplifier.

Current drift from cold to normal operation and hot operation is normal too.

Differences of stand by current when you measure the positive rail compared to the negative rail is also normal...this amplifier sucks more current in the positive rail because of zener current you have in the positive rail

regards,

Carlos
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Last edited by destroyer X; 25th November 2011 at 06:15 PM.
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Old 26th November 2011, 05:40 PM   #6946
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Hi Carlos

Nice project , Trying to build these amp , but can i use the

2SA1302 & 2SC3281


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to subtitute the 2SA1943 & 2SC5200 ?
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Old 26th November 2011, 06:55 PM   #6947
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Default Yes, of course you can, they belong to the same family

2SC5200 and 2SA1943 are the next generation.... they are cousins... they are almost the same...small differences in power dissipation and other details.

No problems...will work fine and great with them.

regards,

Carlos
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Old 26th November 2011, 07:53 PM   #6948
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hi , there are somes photographs of the pcb alone, and the populated pcb,this amp work quite well i tested it with b&w speakers ..its great,no hum , no hiss,easy to adjust as long as you follows instructions on greg web site ,as someone previously said if i can do it everyone can do it.
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Click the image to open in full size.
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Old 26th November 2011, 08:30 PM   #6949
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Default Very good... i am glad you made your own board

Congratulations..... it is looking good...you have made a silk screen..... that's nice.

regards,

Carlos
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Old 29th November 2011, 01:11 AM   #6950
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its my bad that's why the amp produce hum. its because the wire i used in the input creates noise. so i wired up coaxial wire and it sound super silent. without noise and hiss. i'm very happy with this amp. i just want to try the dx mkIII-hx soon. God bless you carlos.
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