Ever hear of bad karma? I think you are about to find out.
There is absolutely no way Yamaha will allow someone to sell fake stuff with the Yamaha name on it.
And they have lots of expensive lawyers just looking for people to harass.
There is absolutely no way Yamaha will allow someone to sell fake stuff with the Yamaha name on it.
And they have lots of expensive lawyers just looking for people to harass.
Speaking honestly. You need to actually build the sections and test them in physical form. From there, determine how much noise and hum is tolerable (when it affects the output). This isn't about being cheap, it is about finding out what the limits are to make an intelligent decision as to what you need. The more complicated something is, the more failure-prone it may be.
So you need to sit down with an experienced technician with the required test equipment (and training) in order to design anything audio. I've been in enough design labs (for audio) where the engineers do exactly that, then once things satisfy the goals, they listen to it. If you price yourself out of the market with something needlessly too complicated it won't sell enough units anyway. That is a totally wasted effort that cost a lot of money.
So you need to sit down with an experienced technician with the required test equipment (and training) in order to design anything audio. I've been in enough design labs (for audio) where the engineers do exactly that, then once things satisfy the goals, they listen to it. If you price yourself out of the market with something needlessly too complicated it won't sell enough units anyway. That is a totally wasted effort that cost a lot of money.
We have certainly gained a great deal of knowledge in the past three years.
Thank you for pointing out my faults, if you need more I can bring up quotes from 70 years ago that you could use to further discredit me.
We are actually trying to assist you while also being realistic. I think it is a cool project.
If it looks like a Yamaha CA-1000 you may possibly run into trouble with Yamaha. I'm no expert in law, but this bears some research on your end.
As far as the questions / suggestions I made about the power supply, I am stunned they haven't been asked yet in the previous years of development. They are very basic questions.
If it looks like a Yamaha CA-1000 you may possibly run into trouble with Yamaha. I'm no expert in law, but this bears some research on your end.
As far as the questions / suggestions I made about the power supply, I am stunned they haven't been asked yet in the previous years of development. They are very basic questions.
I know, I have read it all. You are designing a system.
New design PCBs. Great. Have you built and actually tested a few on a bench?
Right there it tells everyone you don't know what you need or want. This is unrealistic, doable but horrible expensive for the end product. This is what I've been trying to tell you.
New design PCBs. Great. Have you built and actually tested a few on a bench?
The preamp and power amp design is new within the past couple weeks. I have not had them fabricated yet.
The concept used for this effort have been built and tested.
If you check above, I've asked you at the bare beginning of your thread what Yamaha says about your attempts.
First you said you cloned everything except PSU. Then it's probably gonna be only one unit for yourself, and you have a cloned PSU as well. Then there are redesigned parts for which you need a new PSU.
I highly doubt you're not sure what and why are you trying to achieve. Just not transparent enough about it.
Maybe you're trying to push out a clone. Maybe you're using this unit as a base, and trying to evolve it to a similar (better?) product, and push it out as DIY kit. Too many maybes and too shady for my taste.
All the best!
Hi Want to be,
Okay. We've danced around this a bit.
You have simulated it, you have not built it. Until you build and test it, you know nothing. Driving a simulator has very little to do with real life. Even the PCB layout can make or break it. I said that earlier.
Once you build it, check to see how susceptible it is to supply noise. I said ...
Anyway, I'm outta here.
Okay. We've danced around this a bit.
You have simulated it, you have not built it. Until you build and test it, you know nothing. Driving a simulator has very little to do with real life. Even the PCB layout can make or break it. I said that earlier.
Once you build it, check to see how susceptible it is to supply noise. I said ...
Simulators used by design professionals at work are something the average person cannot afford. They simulate effects of PCB layouts as well. Skill and experience guide most of the old folks around here. So until it is built and working to expectation, you have exactly zero. Just intentions. With an excellent simulator, you can simulate power supply noise and come up with reasonable requirements. You have not done that either.
Anyway, I'm outta here.
You should take the time to read my complete thread and just not extract part of one statement and mix it with another.
I am also well aware of the art of prototype to finished product. I expect change in this effort as the PCB's are built and tested on the bench. Nothing new with that. I believe this is also applicable to the power supply.
This reminds me of a guy I met when I worked briefly in Edmonton at a Radio Shack in the 1970's. Computer were new then and he was determined to build one out of TTL logic chips, ie faster than NMOS. Later at HP, an engineer told me that her sister dated just such a guy. Of course, he failed and was left very bitter. I wasted a lot of time dreaming about making the world's best amp. I wasted several years working for peanuts in the sound business. But fortunately, eventually, I found real rewarding uses/jobs for my talents.
Today, nobody needs an amp like this Yamaha. There is no market. Except for a few "audiophiles", today no one needs an amp with a bunch of RCA inputs, nor tape in and out, nor more than one set of speaker terminals. Amplifiers need Bluetooth and maybe a network connection and maybe one 3.5mm jack. A computer or a phone, handles all the signal storage and processing, ie no pre-amp and CD drives are used once to rip albums. You don't wire your house for anything except mains power. It's all wireless, including speakers. We are well into the 21st century folks.
Today, nobody needs an amp like this Yamaha. There is no market. Except for a few "audiophiles", today no one needs an amp with a bunch of RCA inputs, nor tape in and out, nor more than one set of speaker terminals. Amplifiers need Bluetooth and maybe a network connection and maybe one 3.5mm jack. A computer or a phone, handles all the signal storage and processing, ie no pre-amp and CD drives are used once to rip albums. You don't wire your house for anything except mains power. It's all wireless, including speakers. We are well into the 21st century folks.
DRC tells you that nothing is shorted, and that all nets are connected and match the schematic, it does not warn you about something like a shared ground trace mixing class B output stage current with the input stage feedback divider or such.
Layout MATTERS, and the only way (that makes sense for audio) it to spin the board and measure (There are mixed physics and 3D EM solvers that can be used, but they are WAY more work then they are worth for this).
Layout in reality is the difference between 0.01% and 0.001% THD.
There is nothing here that needs special power supply, and really no point in going for microvolt level power supply noise unless you are doing it right on the PCB at the point of load (And even then improving PSRR is likely easier).
Layout MATTERS, and the only way (that makes sense for audio) it to spin the board and measure (There are mixed physics and 3D EM solvers that can be used, but they are WAY more work then they are worth for this).
Layout in reality is the difference between 0.01% and 0.001% THD.
There is nothing here that needs special power supply, and really no point in going for microvolt level power supply noise unless you are doing it right on the PCB at the point of load (And even then improving PSRR is likely easier).
This is what I was thinking when I started the thread and showed the schematics and PCB's.
Hire not one but three designers (yes this triples the design cost). Build prototypes of all three designs and evaluate their performance. Evaluate their manufacturing cost. Evaluate their sonic strengths and weaknesses when coupled to the Yamaha-clone amplifier. Then choose the power supply whose performance + cost + sonic virtues, pleases you the most.
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