Totally granted Pano.
I have read the rules.
But this episode will simply cause the engineers and hobbyists who spend countless hours developing circuits and ideas from sharing these with other DIYers on here if its going to be plagiarized and commercialized. All to the detriment of this forum and the generosity of its members and those members who are honest enough to only use these ideas and circuits for their own use.
I have read the rules.
But this episode will simply cause the engineers and hobbyists who spend countless hours developing circuits and ideas from sharing these with other DIYers on here if its going to be plagiarized and commercialized. All to the detriment of this forum and the generosity of its members and those members who are honest enough to only use these ideas and circuits for their own use.
The long and winding road to creation
I was astounded by this documentary on a American icon, the Carter Family. I didn't know Woody Guthrie, another American icon, and acquaintance of the Carter's, took one of Carter's song, change it around, and turn it into "This Land Is Your Land", an American national treasure. It appears the Carter's version was based on the melody of yet another tune A. P. Carter found.
I'm not condemning.
I was astounded by this documentary on a American icon, the Carter Family. I didn't know Woody Guthrie, another American icon, and acquaintance of the Carter's, took one of Carter's song, change it around, and turn it into "This Land Is Your Land", an American national treasure. It appears the Carter's version was based on the melody of yet another tune A. P. Carter found.
I'm not condemning.
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Yeh but at least you get to hear that music 😉 Do you think you will ever see the schematic of that amplifier if its locked up in a commercial design and you have to pay $$$$ to gain access to it and then spend a huge amount of time reverse engineering what otherwise should have been posted here in the first place for the benefit of the diyaudio community ?
It don't sound fair to me. It sounds very one sided.
cheers
Circuit piracy to me.
We had a famous court case here in Australia about the plagiarism of one the most famous Australian songs of all time. Men at Works, I come from a land downunder.
Larrikin Music accused the band of stealing the song's flute riff from the children's song Kookaburra Sits In The Old Gum Tree. Quote from ABC news.
Men at Work lost. Not the first time a band has been accused of stealing, and lost the court case.
So to me it doesn't matter if you only use some of the song or all of the song. It doesn't matter to me if you use all of the circuit or some of the circuit, ask advice and some one spends their time and effort to solve your problem, in the belief that this is a personal project and not a commercial venture, well to me that's just theft, just like Men at Work.
I won't say anymore about this subject. Good luck with the work Sandro, you are an excellent engineer and very tolerant guy.
We had a famous court case here in Australia about the plagiarism of one the most famous Australian songs of all time. Men at Works, I come from a land downunder.
Larrikin Music accused the band of stealing the song's flute riff from the children's song Kookaburra Sits In The Old Gum Tree. Quote from ABC news.
Men at Work lost. Not the first time a band has been accused of stealing, and lost the court case.
So to me it doesn't matter if you only use some of the song or all of the song. It doesn't matter to me if you use all of the circuit or some of the circuit, ask advice and some one spends their time and effort to solve your problem, in the belief that this is a personal project and not a commercial venture, well to me that's just theft, just like Men at Work.
I won't say anymore about this subject. Good luck with the work Sandro, you are an excellent engineer and very tolerant guy.
I suddenly have a problem with all my stability sims using the probe and setting shown in Sandro's videos. They have all woked before, but now I get this message in the error log:
WARNING: unknown token in: "-1/(1-1/(2*(i(lgs:vi)[@]1*v(lgs:x)@2-v(lgs:x)@1*i(lgs:vi)@2)+v(lgs:x)@1+i(lgs:vi)@2))"
And in the bode plot I get an error message 'Unknown current requested: I(LGS:Vi)
When adding this trace
-1/(1-1/(2*(I(LGS:Vi)@1*V(LGS:x)@2-V(LGS:x)@1*I(LGS:Vi)@2)+V(LGS:x)@1+I(LGS:Vi)@2))
I even tried on two computers, but get the same result. Suggestions?
WARNING: unknown token in: "-1/(1-1/(2*(i(lgs:vi)[@]1*v(lgs:x)@2-v(lgs:x)@1*i(lgs:vi)@2)+v(lgs:x)@1+i(lgs:vi)@2))"
And in the bode plot I get an error message 'Unknown current requested: I(LGS:Vi)
When adding this trace
-1/(1-1/(2*(I(LGS:Vi)@1*V(LGS:x)@2-V(LGS:x)@1*I(LGS:Vi)@2)+V(LGS:x)@1+I(LGS:Vi)@2))
I even tried on two computers, but get the same result. Suggestions?
Hi Rallyfinnen, it is probably a hierarchy issue. is the probe on the top level of the schematic?
Also have you checked that you are storing all currents and voltages inside all blocks?
Also have you checked that you are storing all currents and voltages inside all blocks?
Thank you for your reply!
Yes, I have everything in one sim (simple man, simple setup 🙂)
I'm sorry, I don't understand the second question, but I guess it does not apply since I have everything in one sim?
For some reason I got my KX amp sim running after copy/pasting all the tian-related spice directives in again. It does seem odd that all those would have gone wrong in all my sims at once though..
BTW, did you ever have a look at the stability of that amp? I remember Andrew mentioned he was going to ask you for some support on that. I think the problem is mostly solved, but I still see a minor oscillation at startup.
Yes, I have everything in one sim (simple man, simple setup 🙂)
I'm sorry, I don't understand the second question, but I guess it does not apply since I have everything in one sim?
For some reason I got my KX amp sim running after copy/pasting all the tian-related spice directives in again. It does seem odd that all those would have gone wrong in all my sims at once though..
BTW, did you ever have a look at the stability of that amp? I remember Andrew mentioned he was going to ask you for some support on that. I think the problem is mostly solved, but I still see a minor oscillation at startup.
I had a look at the settings in the control panel and found the settings to store all data, and that seemed to solve it.
Thank you again!
Thank you again!
Hello Sandro,
I just found your YT page and I am really enjoying the content and delivery. I know how busy you must be with a new start-up and all, but I just wanted you to know I have subscribed and I am listening...........
THANK YOU so much for your efforts and MASSIVE contribution to our hobby.
Looking forward to any more that follows.
Cheers,
David
I just found your YT page and I am really enjoying the content and delivery. I know how busy you must be with a new start-up and all, but I just wanted you to know I have subscribed and I am listening...........
THANK YOU so much for your efforts and MASSIVE contribution to our hobby.
Looking forward to any more that follows.
Cheers,
David
Hello Sandro,
Your channel is very interesting. Do you have any news about new videos ?
Regards,
Dimitri
Your channel is very interesting. Do you have any news about new videos ?
Regards,
Dimitri
Hi Sandro,
A huge thanks for your fantastic vid series. Although I've tinkered with Audio electronics for a few years on and off, I have a pretty limited basis in theory and your vids have been the best resource I have found to get my head around the workings of amps and LTSpice.
This is probably a pretty basic newbie question, but I have been trying to run THD analysis following your approach on a Tube Phono PreAmp Circuit (Cornet3 by Jim Hagerman) and can not work out how to get rid of the sloping noise floor which is masking the harmonics (its up at -40dB@100Hz). The input sine is ok, but there is no input capacitor or feedback loop in the circuit to short - just 2 standard triode (12AX7) gain stages and a CCS fed cathode follower(12AU7). I assume noise floor issues in tube circuits are treated differently - just wondering if you have any general guidance on how to get rid of them?
Cheers Paul.
A huge thanks for your fantastic vid series. Although I've tinkered with Audio electronics for a few years on and off, I have a pretty limited basis in theory and your vids have been the best resource I have found to get my head around the workings of amps and LTSpice.
This is probably a pretty basic newbie question, but I have been trying to run THD analysis following your approach on a Tube Phono PreAmp Circuit (Cornet3 by Jim Hagerman) and can not work out how to get rid of the sloping noise floor which is masking the harmonics (its up at -40dB@100Hz). The input sine is ok, but there is no input capacitor or feedback loop in the circuit to short - just 2 standard triode (12AX7) gain stages and a CCS fed cathode follower(12AU7). I assume noise floor issues in tube circuits are treated differently - just wondering if you have any general guidance on how to get rid of them?
Cheers Paul.
Attachments
In case anyone else has the same issue, just thought i'd post the solution.
As far as I can determine this issue appears to be a much longer "settling" period for Tubes compared to SS amps. By increasing the wait time/cycles before the fft samples the waveform the noise floor is substantially reduced and flattened. Unfortunately the simulations also take a MUCH longer time to complete.
For reference, I moved from Sandro's 10 cycle wait time to 100 cycles to reduce the starting (100Hz) noise floor from c -40dB to c -80db, then to 1000 cycles (1 second wait) to get it down another 40dB to just below -120dB. I assume increasing the wait more will lower it further as the noise floor still has a slope of c -20dB/10x freq. I attach the 1000 cycle wait fft for reference.
Attachments
Hi Paul, thanks! I wish I had time to continue doing the series. I just got swamped by work.
Do you have a schematic to take a quick look?
Do you have a schematic to take a quick look?
Haha - work has a tendency to do that!
I think the attached are all files required, let me know if I've missed anything required. I also include a jpg of the schematic in case the LTSpice stuff isnt sufficient.
Cheers Paul
Attachments
Hi Paul, it is due to the output capacitors C_CO-L and C14. Make them ridulously large, say 1 farad, and try again.
Best, Sandro
Best, Sandro
Got it - many thanks!
Out of interest will this change the distortion results or just allow the circuit to settle more quickly - ie should I get the samish THD results with the high cap as by running the sim for a long time as I've done to date?
Cheers Paul.
Out of interest will this change the distortion results or just allow the circuit to settle more quickly - ie should I get the samish THD results with the high cap as by running the sim for a long time as I've done to date?
Cheers Paul.
Given the capacitors are ideal in LTSpice, it should not change any distortion results. All it does is lower the output time constant so that it does not mask the low frequency harmonics. NOTE: If you still do not see the noise floor with 1 farad, make the caps bigger, like 10Kilo farads and so on.
