as you may expect - it depends. first question is if you understand the technology differences between the MOSFETs? You can see from the datasheets that they are NOT drop-in replacements at all.
BTW, your question reminded me of a very gentlemanly discussion quite some years ago between Nelson Pass and Charles Hansen (RIP) that touched on some differences between VMOS and Lateral MOSFETs. It would be useful reading for such a venture. If I find a link, I'll share it. I suspect someone else will beat me to it. And, although we've lost A LOT of the incredible expertise that visited this site over years past, there is still a lot of really good stuff around that if sorted through and studied can be helpful for budding designers as well as experts - it can save one lots time, save some PCB revs and avoid some burned up parts ! 😉
Hi, thanks for you repli. I will try to answer your questions, honestly and clearly:
My first goal is to build an amplifier that works like my system. It's not the first one but in the other occasions were easy projects that it hasn't given me many problems.
At the same time I want to acquire skills, not to design, but to know how to solve problems in future assemblies.
My level of knowledge, electronics technician, mainly in repairing communications equipment. I have always been enthusiastic about the world of audio, amplifiers and loudspeakers, in fact I have built loudspeakers too.
It is true that designing, assembling and testing is not easy, but as a technician I like to try. In this case I bought the Exicon because Profusion told me that they are the replacements for Hitachi, and it has become clear to me that this is not the case. After a lot of reading and looking around the forum, I have seen some great projects with these MOSFETs, assuming that they are not all the same. That is why I am asking the question and trying to save the investment in components.
I thank you for your honesty, and I also reply that my goal is to enjoy a self-made amplifier.
Thank so much.
47 ohms both on positive and negativ rail.
I just checked the amp in TINA with somewhat other transistors and it worked well but only without C5.
I changed R13 and R15 to 47 ohms and R16 to 33 ohm.
It doesnt have so much open loop gain so the distortion value will not be so good but it sounds better than expected due to mosfets instead of bipolar output transistors. I used 2 of them a few years as PA amplifier for a rock band.
I think mine were about 0,05% distortion at full power.
I just checked the amp in TINA with somewhat other transistors and it worked well but only without C5.
I changed R13 and R15 to 47 ohms and R16 to 33 ohm.
It doesnt have so much open loop gain so the distortion value will not be so good but it sounds better than expected due to mosfets instead of bipolar output transistors. I used 2 of them a few years as PA amplifier for a rock band.
I think mine were about 0,05% distortion at full power.
Hello friends, I continue with the tests of the different configurations. 😀.
At the moment, this is the best option I see for this project. What do you think of these measures?
Image1: how Flikoman describes without C8
Image 2: how Flikoman describes without C8, and C6-C7 to 150pF.
I continue with some more tests,
This option doesn´t work.
This option doesn´t work
This option work, I think well, I add oscilloscope image.
At the moment, this is the best option I see for this project. What do you think of these measures?
Image1: how Flikoman describes without C8
Image 2: how Flikoman describes without C8, and C6-C7 to 150pF.
I continue with some more tests,
Attachments
This option the test is not clear, because the measurement is with C8 on, now I don't remember if I test it without C8.
I do it egain.
This is the measurement, oscillation also affects the input waveform.
