SX-Amp and NX-Amp

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#1,802
Kaplaars said:
Although risking of going a bit off topic, I cant help to mention that I can’t believe my eyes… did AndrewT now really beseech to obtain a piece from Jims Audio? 🙄 After all those crusades against Jims Audio. Even the original KSA-100 threads name was changed to besmirch Jims reputation. And now this… wow, I am kinda shocked. Now, dear AndrewT, since Jim is nowadays even accepted by you, would it not be nice if the KSA-100 threads name was restored as well?

Back on topic. Being a loyal customer of Jims Audio I saw that he was offering the nice boards designed by Bonsai. After checking the hifisonix.com website I had to have them 🙂...............
Click to expand...
Jim's Audio is the recognised/approved retailer of the NX PCBs by Bonzai.
I did not buy from Jim's Audio.
Jim's Audio still has my Email address on his "do not supply" list.
I don't know how he associated my Email to my Forum name, but he did and I suspect an infringement of the UK's data protection laws.

Jims Audio still sells fakes and stolen copyrighted materials.
Being a loyal customer of Jims Audio
Click to expand...
Do you condone criminal activity?
 
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#1,803
AndrewT said:
Jim's Audio is the recognised/approved retailer of the NX PCBs by Bonzai.
I did not buy from Jim's Audio.
Jim's Audio still has my Email address on his "do not supply" list.
I don't know how he associated my Email to my Forum name, but he did and I suspect an infringement of the UK's data protection laws.
Click to expand...

Well, at least you made quite some effort to buy from Jim, weren't you 🙄 ?

Well...

AndrewT said:
Jims Audio still sells fakes and stolen copyrighted materials.Do you condone criminal activity?
Click to expand...

...it appears you are; by having (at least) the intention in buying from him you are indirectly supporting his activities. Again you fall into the same trap by calling Jim a criminal. Thereafter, you basically state that everybody that has bought a PCB by Jim is a criminal. Very dogmatic and incorrect, although fascinating 😉

Sorry for going off topic Bonsai, but I could not resist 😀
 
#1,804
Jims audio is doing excellent job in PCB making without him I cannot have build NX amp.I like to build SX first I changed my mind because of the unavailability of SX PCB at that time.As price vs quality he done excellent job in PCB making.I support Jim's audio in my all future DIY builds.
I would like to thank Bonsai for providing such an excellent PCB from Jims Audio.
 
#1,805
Hey Bonsai,

Thanks for sharing this wonderful design for DIY 🙂

I have sourced the sx amp pcbs from jims audio and in the process of sourcing components..

Request help with clarifying my understanding of below

1. J2 should be shorted
2. R20 should be 2.2k 0.5W
3. Q3 should be BC547 through hole
4. R4 value is 15R on circuit diagram and 100k on pcb -- which one to go with? Is 0.5W critical for 100k resistor or any 0.25W would do?
5. Could not see C1 10uf, 50v on pcb (the smd pads on back side of pcb for this? )

Thanks
 
#1,806
AndrewT, please keep comments about Jim's Audio off this thread.

You cannot go slinging accusations of theft etc without proof (and no, I don't want to see or hear what you have).

I have a mutual agreement with Jim's Audio to supply nx and sx PCB's and so far ther are about 100 or so happy customers.

Let's keep this thread about the amplifiers in question and leave the politics out of it.

Thank you

😎
 
#1,808
Hello Balu,

1. J2 should be shorted - YES

2. R20 should be 2.2k 0.5W - YES. ADJUST R6 FOR MAXIMUM AND NOT MINIMUM AS IT STATES IN THE BUILD DOCUMENT

3. Q3 should be BC547 through hole - YES

4. R4 value is 15R on circuit diagram and 100k on pcb -- which one to go with? Is 0.5W critical for 100k resistor or any 0.25W would do? - 15 OHMS - BUT IT WILL BE SHORTED OUT VIA J2 ANYWAY. 0.25W IS OK
5. Could not see C1 10uf, 50v on pcb (the smd pads on back side of pcb for this? ) - YES - C1 IS 1206 SMD ON BACK OF PCB. THIS IS NOT CRITICAL - IF YOU CANNOT GET IT, LEAVE IT OFF. IT JUST FILTERS ANY REMAINING NOISE FROM THE OFFSET ADJUST CIRCUIT.

Good luck with your build!
 
#1,810
Dear Andrew, I am currently using the V2.0.9 manual. I have found some discrepancies:

On page 52 PDTC143ET is printed on the bottom side of the PCB. However the BOM mentions PDTC144ET. I assume I have to use the PDTC144ET for U2 right?

On page 51 is no BC847 visible. Unfortunally my PCB's lack a printed silk screen at the bottom side. To be sure, am I correct that it has to be soldered where the yellow circle is? Also what value is the SMD component in the red circle?
 

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#1,813
Kaplaars said:
Dear Andrew, I am currently using the V2.0.9 manual. I have found some discrepancies:

On page 52 PDTC143ET is printed on the bottom side of the PCB. However the BOM mentions PDTC144ET. I assume I have to use the PDTC144ET for U2 right?

On page 51 is no BC847 visible. Unfortunally my PCB's lack a printed silk screen at the bottom side. To be sure, am I correct that it has to be soldered where the yellow circle is? Also what value is the SMD component in the red circle?
Click to expand...

Hello Michael

1. U2 is PDTC144. This has internal 47k resistors (143 has 4.7k - too low)

2. If you look under where Q2 is (this is the NJW3281) you will see where the BC847 solders down. This is the sensing transistor for the Vbe compensation. Use tweezers and thin solder to place it.

3. Component in the red circle - sorry can you give me more info on your question?

Your boards are looking very good!
 
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