Hello,
I'm looking for an online electronics tutor to help me to reach a point where I can design my own audio circuits. You don't have to be a qualified electronics teacher but someone with good knowledge, maths, and enthusiasm.
Since 2012 I have been experimenting with building audio gear kits, upgrading/modifying recording consoles, in 2017 I landed a job as a service tech at my local hifi shop where I now manage my own service department repairing all sorts of audio equipment, mainly hifi but also pro audio.
In 2017 I also did a year of electronics to consolidate all the bits of knowledge I learned over the years, however since then I have been pretty busy with a young family, and due to lack of practice, I forgot a lot of stuff, especially when comes to maths.
I have a lot of good resources at hand in terms of books, e.g Art of Electronics, Designing Power Amplifiers (Bob Cordell), Small Signal Audio Design (Douglas Self),
I'm familiar with simple BJT/JFET DC, AC circuit analysis but I'm not sure how do I go about scaling this up to more complex topologies, multistage amplifiers etc.
I have a special interest in distortion and how it affects the perception of sound, especially when comes to power amplifiers.
Ideally, I would like to establish a long-term relationship and I would be looking for, let's say, 3 email exchanges a month and one zoom/skype call, where you can give me a list of study topics, math exercises etc.
My aim is to develop an understanding of the design process rather than completing any specific project.
If you feel that you could/want to help me then feel free to send me a message.
My audio related social media:
Yestersound
Loudandclearworkshop
All the best,
Hubert
I'm looking for an online electronics tutor to help me to reach a point where I can design my own audio circuits. You don't have to be a qualified electronics teacher but someone with good knowledge, maths, and enthusiasm.
Since 2012 I have been experimenting with building audio gear kits, upgrading/modifying recording consoles, in 2017 I landed a job as a service tech at my local hifi shop where I now manage my own service department repairing all sorts of audio equipment, mainly hifi but also pro audio.
In 2017 I also did a year of electronics to consolidate all the bits of knowledge I learned over the years, however since then I have been pretty busy with a young family, and due to lack of practice, I forgot a lot of stuff, especially when comes to maths.
I have a lot of good resources at hand in terms of books, e.g Art of Electronics, Designing Power Amplifiers (Bob Cordell), Small Signal Audio Design (Douglas Self),
I'm familiar with simple BJT/JFET DC, AC circuit analysis but I'm not sure how do I go about scaling this up to more complex topologies, multistage amplifiers etc.
I have a special interest in distortion and how it affects the perception of sound, especially when comes to power amplifiers.
Ideally, I would like to establish a long-term relationship and I would be looking for, let's say, 3 email exchanges a month and one zoom/skype call, where you can give me a list of study topics, math exercises etc.
My aim is to develop an understanding of the design process rather than completing any specific project.
If you feel that you could/want to help me then feel free to send me a message.
My audio related social media:
Yestersound
Loudandclearworkshop
All the best,
Hubert
Re: Help Part 2
Hi Hubert, Part 2 continues
Here's a copy of what I posted on a correlation of clip behavior to sonic signature
Non-switching complimentary output stage Post 37
3) "yet this is very subjective and everyone likes different kinds of sonic signatures of their audio equipment."
Your idea for real time measuring of brain activity (in the pleasure center) would be one way to check the unanswered questions about perceived sound signatures for amplifiers - whether it exists or not - and if it exists then what harmonic signatures give good effects and what give bad and what are neutral.
----------------
Are you arware of this research? Hypersonic effect - Wikipedia
T. Oohashi, E. Nishina, M. Honda, Y. Yonekura, Y. Fuwamoto, N. Kawai, T. Maekawa, S. Nakamura, H. Fukuyama, and H. Shibasaki. "Inaudible high-frequency sounds affect brain activity: Hypersonic effect." Journal of Neurophysiology, 83(6):3548–3558, 2000.
-----
BTW
1. A surgical Chip-brain implant allows thoughts to be read by a machine (eg PC) as . TGR proponents are hoping to have them on us by 2030.
2. There's also possibilities of using a neurophone (not sure how but you may find it an interesting aside)
Neurophone advantages, Science and Neurophone benefits: Neurophone and Its Benefits invented by Patrick Flanagan in 1958, it bypasses the hearing nerve and transmits sound waves directly to the brain ...Three dimensional hearing ...bypasses the conscious mind and transmits the information directly to the subconscious mind hence making it possible for everyone and anyone to access high volumes of information even while resting or sleeping. http://myneurophone.blogspot.com.au/2013/04/neurophone-mind-control.html Dr. Patrick Flanagan in his interview with Jeff Rense exerted that one of his inventions, the Neurophone, was seized by National Security Agency as it was believed to have potential of controlling mind. [was top secret for decades] http://www.flanagan-neurophone.com/Informationsmaterial/Neurophone_eBook.pdf (in German). http://www.youtube.com/watch?v=k9F7U42tasw unboxing and some info, 3:50 min "Skin as transducer to send to the saccule (balance part in ear)" 4:38 like dolphins ..."brings together the left and right hemisphere of the brain" http://hackaday.com/2012/08/07/diy-flanagan-neurophone-lets-you-hear-with-ultrasound/ from http://neurophone.wordpress.com/2012/08/05/make-a-diy-flanagan-neurophone-with-a-tl494/
My apology for being brutally honest on what I believe (actually not my ideas per se, I just agree with those whom I have cited). No worries if you want to believe otherwise. Your ideas of research could prove I am wrong😱 - all the best🙂.
Cheers, IanH
Hi Hubert, Part 2 continues
Here's a copy of what I posted on a correlation of clip behavior to sonic signature
Non-switching complimentary output stage Post 37
Re: Quest for amplifiers with Class-A character (but economical as Class-AB).
This has been the aim of amplifier designers for the past 60 years since transistors were used. The THD has fallen progressively and commercial amps have been available with ppm THD, eg Halcro 1994 circuit here US5892398A - Amplifier having ultra-low distortion, and review here Halcro dm38 power amplifier | Stereophile.com
And what did it sound like? Reviewers were not satisfied with what they heard. Why? Because they liked tube amplifiers more than distortionless amplifiers!
This is an enigma that I have thought long and hard about since I read the Halcro review 2 decades ago. I slowly came to the realization that amplifiers need to clip softly – not hard clip like 99.9% of solid-state amps do.
Bob Cordell helped me along the way. He did an Audio Engineering seminar where he showed even 250W amplifiers do clip quite often even with not too loud music!
So when a reviewer takes care not to clip solid-state amplifiers they don't give as good a sound as a tube amplifier that soft clips because the tube amp gives more 'acuity'* or 'involvement'* per watt rating. The single digit ppm THD readings of the solid-state amp doesn't count much in this type of listening test.
And if all that is true then what we need is solid-state amps with soft clipping. And if all that is true we don't really need such low THD readings.
The amplifier I arrived at based on this thinking was published in Linear Audio Volume 8 and updated amp Volume 13. A free supplement gives an overview of the developments and references here Cube-Amp_LACAv8-Supplement-2+_08Apr2017.pdf - Google Drive.
* Ref Stereophile: Sounds Like? An Audio Glossary . Also rare blind test of tube and solid-state here A Future Without Feedback? | Stereophile.com Martin Colloms, 03 Jan 1998 Primer on no negative feedback [5 pages, 3 pg LTE] "When the results of the blind test were analyzed, the tubed Radford had come in first, despite showing the poorest measured performance." So it wasn't that the reviewer saw its red glowing tubes and liked that amp better than the solid-state one.This has been the aim of amplifier designers for the past 60 years since transistors were used. The THD has fallen progressively and commercial amps have been available with ppm THD, eg Halcro 1994 circuit here US5892398A - Amplifier having ultra-low distortion, and review here Halcro dm38 power amplifier | Stereophile.com
And what did it sound like? Reviewers were not satisfied with what they heard. Why? Because they liked tube amplifiers more than distortionless amplifiers!
This is an enigma that I have thought long and hard about since I read the Halcro review 2 decades ago. I slowly came to the realization that amplifiers need to clip softly – not hard clip like 99.9% of solid-state amps do.
Bob Cordell helped me along the way. He did an Audio Engineering seminar where he showed even 250W amplifiers do clip quite often even with not too loud music!
So when a reviewer takes care not to clip solid-state amplifiers they don't give as good a sound as a tube amplifier that soft clips because the tube amp gives more 'acuity'* or 'involvement'* per watt rating. The single digit ppm THD readings of the solid-state amp doesn't count much in this type of listening test.
And if all that is true then what we need is solid-state amps with soft clipping. And if all that is true we don't really need such low THD readings.
The amplifier I arrived at based on this thinking was published in Linear Audio Volume 8 and updated amp Volume 13. A free supplement gives an overview of the developments and references here Cube-Amp_LACAv8-Supplement-2+_08Apr2017.pdf - Google Drive.
3) "yet this is very subjective and everyone likes different kinds of sonic signatures of their audio equipment."
Your idea for real time measuring of brain activity (in the pleasure center) would be one way to check the unanswered questions about perceived sound signatures for amplifiers - whether it exists or not - and if it exists then what harmonic signatures give good effects and what give bad and what are neutral.
----------------
Are you arware of this research? Hypersonic effect - Wikipedia
T. Oohashi, E. Nishina, M. Honda, Y. Yonekura, Y. Fuwamoto, N. Kawai, T. Maekawa, S. Nakamura, H. Fukuyama, and H. Shibasaki. "Inaudible high-frequency sounds affect brain activity: Hypersonic effect." Journal of Neurophysiology, 83(6):3548–3558, 2000.
-----
BTW
1. A surgical Chip-brain implant allows thoughts to be read by a machine (eg PC) as . TGR proponents are hoping to have them on us by 2030.
2. There's also possibilities of using a neurophone (not sure how but you may find it an interesting aside)
Neurophone advantages, Science and Neurophone benefits: Neurophone and Its Benefits invented by Patrick Flanagan in 1958, it bypasses the hearing nerve and transmits sound waves directly to the brain ...Three dimensional hearing ...bypasses the conscious mind and transmits the information directly to the subconscious mind hence making it possible for everyone and anyone to access high volumes of information even while resting or sleeping. http://myneurophone.blogspot.com.au/2013/04/neurophone-mind-control.html Dr. Patrick Flanagan in his interview with Jeff Rense exerted that one of his inventions, the Neurophone, was seized by National Security Agency as it was believed to have potential of controlling mind. [was top secret for decades] http://www.flanagan-neurophone.com/Informationsmaterial/Neurophone_eBook.pdf (in German). http://www.youtube.com/watch?v=k9F7U42tasw unboxing and some info, 3:50 min "Skin as transducer to send to the saccule (balance part in ear)" 4:38 like dolphins ..."brings together the left and right hemisphere of the brain" http://hackaday.com/2012/08/07/diy-flanagan-neurophone-lets-you-hear-with-ultrasound/ from http://neurophone.wordpress.com/2012/08/05/make-a-diy-flanagan-neurophone-with-a-tl494/
My apology for being brutally honest on what I believe (actually not my ideas per se, I just agree with those whom I have cited). No worries if you want to believe otherwise. Your ideas of research could prove I am wrong😱 - all the best🙂.
Cheers, IanH
Can you please elaborate on "acuity," or "involvement" per watt rating?
How would this subjective level increase with clipping?
How would this subjective level increase with clipping?
For free stuff there is a lot of basic electronic videos on you tube.
From basic components and their associated formulas.
To more complex things like Kirchoffs laws, FFT, AC theory etc.
After that there are numerous good books on audio design, might pick up one cheap on ebay. The "Art of electronics " book is highly recommended by many for electronic theory.
From basic components and their associated formulas.
To more complex things like Kirchoffs laws, FFT, AC theory etc.
After that there are numerous good books on audio design, might pick up one cheap on ebay. The "Art of electronics " book is highly recommended by many for electronic theory.
