Destroyer x Amplifier...Dx amp...my amplifier - Page 695

destroyer X · 25th November 2011, 03:02 PM

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

regards,

Carlos

harmonicconverger · 25th November 2011, 03:18 PM

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.

harmonicconverger · 25th November 2011, 03:20 PM

Thank you so much Sir Carlos. :]

harmonicconverger · 25th November 2011, 04:55 PM

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.

destroyer X · 06:15 PM

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

pispot · 26th November 2011, 05:40 PM

Hi Carlos

Nice project

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

2SA1302 & 2SC3281

to subtitute the 2SA1943 & 2SC5200 ?

destroyer X · 26th November 2011, 06:55 PM

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

martin766 · 26th November 2011, 07:53 PM

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.

destroyer X · 26th November 2011, 08:30 PM

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

regards,

Carlos

harmonicconverger · 29th November 2011, 01:11 AM

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.

25th November 2011, 03:02 PM	#6941
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	So, it seems that everything is fine now Bias adjusting, off set adjusting, amplifier playing...seems you succeed... congratulations. regards, Carlos __________________ Sons visiting uncle charlie; http://www.youtube.com/watch?feature...&v=5T76qsvZrdw; http://www.youtube.com/watch?v=Hb_wolQGU5Y

25th November 2011, 06:11 PM	#6945
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	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 __________________ Sons visiting uncle charlie; http://www.youtube.com/watch?feature...&v=5T76qsvZrdw; http://www.youtube.com/watch?v=Hb_wolQGU5Y Last edited by destroyer X; 25th November 2011 at 06:15 PM.

26th November 2011, 06:55 PM	#6947
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	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 __________________ Sons visiting uncle charlie; http://www.youtube.com/watch?feature...&v=5T76qsvZrdw; http://www.youtube.com/watch?v=Hb_wolQGU5Y

26th November 2011, 08:30 PM	#6949
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	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 __________________ Sons visiting uncle charlie; http://www.youtube.com/watch?feature...&v=5T76qsvZrdw; http://www.youtube.com/watch?v=Hb_wolQGU5Y

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25th November 2011, 03:18 PM	#6942
harmonicconverger diyAudio Member Join Date: Nov 2011 Location: Philippines	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.

25th November 2011, 03:20 PM	#6943
harmonicconverger diyAudio Member Join Date: Nov 2011 Location: Philippines	Thank you so much Sir Carlos. :]

25th November 2011, 04:55 PM	#6944
harmonicconverger diyAudio Member Join Date: Nov 2011 Location: Philippines	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.

26th November 2011, 05:40 PM	#6946
pispot diyAudio Member Join Date: Nov 2011	Hi Carlos Nice project , Trying to build these amp , but can i use the 2SA1302 & 2SC3281 to subtitute the 2SA1943 & 2SC5200 ?

26th November 2011, 07:53 PM	#6948
martin766 diyAudio Member Join Date: Nov 2011	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.

29th November 2011, 01:11 AM	#6950
harmonicconverger diyAudio Member Join Date: Nov 2011 Location: Philippines	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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