Sorry, I have not built the DX version.
It is the DX Blame version that I built and tested. (Layout by Omar).
It is the DX Blame version that I built and tested. (Layout by Omar).
The Dx sounds pretty nice to me - I had some issues early on because I tried to power it with 20v rails and that doesn't work. At 35v sounds good with deep bass and pretty good mids. I never had oscillation problem - I did for my own 0.33R emitter resistors though.
sorry Im confused 🙁
which version fo the dx amp is bad and rings? dx amp or dx blame st?
thank you very much for reply.
I think that adding all that stuff you suggested could solve the problem, but I can't understand why the other realizations of dx amp work fine but not mine. Adding emitter R means solder them under the pcb and cutting copper traces, and the same for the miller caps on tip...
I think I will leave this project. I have a pair of pcb ready for DX BLAME amp and all related components buyed on digikey. the transistor I have are MJL3281/Mjl1302.
Or I could realize another class AB amp, stable and with no problems...have you got any suggestions? I was looking at symasym amp (I realized it in the past and it worked good, but I didn't like the sound ver much 🙁 ).
I have all the components for symasym, I miss only mje15030/15031....
I'll appreciate any suggestion to listen and enjoy some music,....help me please
I should not mention it in this thread, but look at the link in my signature, the one on the right there 😉
The DX Blame is the version I tested. It rings badly.
I suspect all the Dx do similar if the compensation is guessed at.
I have all the components for symasym, I miss only mje15030/15031....
I'll appreciate any suggestion to listen and enjoy some music,....help me please[/QUOTE]
I'll take a look and see if I've some for you
I'll appreciate any suggestion to listen and enjoy some music,....help me please
[/QUOTE]I'll take a look and see if I've some for you
thanks a lot. i wa looking for p3a by R. Elliot (I ve all the components ready) but can't find a valid layout for pcb ready to print
q1 & q2 are bc559c
I've 2 populated boards and it is fully working;If you are want them let me know .I also have 2 emty boards of the this amp
Are you shure about Q1-2 they are NPN you need PNP ?You need bc549
I can send you some 2n5401 if you want
Here a link to help in the future http://users.tpg.com.au/gerskine/greg/PNP Small Signal Transistors.htm
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there are some errors in that link...bc549 is NPN, bc559 is PNP
about the board...i think shipment from USA to italy is very expensive and takes a long time...
I only need a p3a layout file...
I founded this, would you give me your opinion about it , please?
about the board...i think shipment from USA to italy is very expensive and takes a long time...
I only need a p3a layout file...
I founded this, would you give me your opinion about it , please?
An externally hosted image should be here but it was not working when we last tested it.
is it right, they are masses
look here
An externally hosted image should be here but it was not working when we last tested it.
I'm not as advance as other members here but try to place the bias transistor into the heat sink so will track bias "insulated" and adjust bias to about 15 mV reading one single emitter resistor
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