@Want to be
Hey sorry just want to check if I'm understanding this whole thing correctly.
You guys are reversing the CA 1000 (amp section, preamp section, auxiliary pcbs...) and now you have everything except the PSU?
Hey sorry just want to check if I'm understanding this whole thing correctly.
You guys are reversing the CA 1000 (amp section, preamp section, auxiliary pcbs...) and now you have everything except the PSU?
And you will offer it commercially? What does Yamaha say about it?
Wow.
Okay, I serviced these amplifiers and all their products for years. I was authorized warranty for Yamaha among others. Their power supply designs were pretty decent. The biggest problem was heat some times.
So, the first thing you do is vary some parameters in the power supply to observe and measure the effect on output and noise. So noise and ripple levels to see what shows up in the audio output. This determines the level of performance you need. You may find that the original supply design was good enough, or merely needs a bit of a performance boost.
Measure an original unit, then measure your boards and installation in another. Make sure your design is at least as good as the original.
Finally, UL and CSA may dash your excellent design. But don't waste money, time and effort designing a supply so far beyond what you need that it becomes less reliable.
Okay, I serviced these amplifiers and all their products for years. I was authorized warranty for Yamaha among others. Their power supply designs were pretty decent. The biggest problem was heat some times.
So, the first thing you do is vary some parameters in the power supply to observe and measure the effect on output and noise. So noise and ripple levels to see what shows up in the audio output. This determines the level of performance you need. You may find that the original supply design was good enough, or merely needs a bit of a performance boost.
Measure an original unit, then measure your boards and installation in another. Make sure your design is at least as good as the original.
Finally, UL and CSA may dash your excellent design. But don't waste money, time and effort designing a supply so far beyond what you need that it becomes less reliable.
I may very well be the only person on Earth that has such a sentimental feeling about this unit, thus it may very well be only this one unit produced.
This original unit was produced in 1974 and is long past any patents. I have been posting this project for three years on many forums as it has been in development and Yamaha has not had any reaction.
Well in that case, if you ever develop a full kit, or something close enough, and are willing to distribute, please put me on the list as a potential buyer. 🙂
Sorry I can't help you regarding the PSU, way above my knowledge and skill set. But I like to solder and put stuff together lol.
Good luck with the project!
We have created copies of the existing Main Amp and Electrolytic PCB's and have available.
The rear panel interface board is new design and available.
The preamp Tone and Filter is still work in progress.
Attachments
Hi Want to be,
Once you know what you need, you can go a little beyond that (prudent). Each supply will probably have vastly differing noise and ripple requirements. Figure it out.
Okay, but you missed the point completely. What performance do you need? It isn't about what you want, and just sticking "the best" together doesn't create a great product.
Once you know what you need, you can go a little beyond that (prudent). Each supply will probably have vastly differing noise and ripple requirements. Figure it out.
All original PCB were tested and deeply analysed thus leading to the process currently underway.
At this point in time the new PCB's have been simulated in spice and the performance look very good.
If you have suggestions on these designs, I would like to hear them.
I am presently maxed out with my knowledge, thus the request for assistance. My prayer is that someone is able to evaluate the posted schematics and determine what is required for excellent performance.
When it comes to the PSU, why don't you reverse the original one, if all other components are original clones? It should fit perfectly right?
We do have clones available, but we also have entirely new designs that need the new design power supply.
Power supply design is likely to affect the sound. Shunts tend to sound different from series regulators, and the output impedance vs frequency is different.
Other tests for power supplies include stepped-load response, error amplifier nonlinearity, vibration sensitivity (related to piezoelectric effects in ceramic capacitors), etc.
Without lab tests of prototype physical power supplies with the end use load circuitry, its hard to predict exactly what the resulting sound will be.
Other tests for power supplies include stepped-load response, error amplifier nonlinearity, vibration sensitivity (related to piezoelectric effects in ceramic capacitors), etc.
Without lab tests of prototype physical power supplies with the end use load circuitry, its hard to predict exactly what the resulting sound will be.
Hi Want to be,
Simulated results aren't worth much. Build, then test. Your wiring layout will affect things greatly as well.
You need to design the entire system. Enclosure, wiring and the boards and circuits. The PCB layout will affect performance greatly, so will random part distribution. Anyway, build each section and test on power supplies. See what matters and what doesn't matter. Then you move from a source of real knowledge instead of optimistic hear-say.
Hi Mark,
The affect of a power supply is highly dependent on the circuit. Many times any reasonable power supply is indistinguishable from another (having tested this with real equipment). Obviously, a mis-matched power supply will affect the sound, as will a poorly designed one.
Simulated results aren't worth much. Build, then test. Your wiring layout will affect things greatly as well.
You need to design the entire system. Enclosure, wiring and the boards and circuits. The PCB layout will affect performance greatly, so will random part distribution. Anyway, build each section and test on power supplies. See what matters and what doesn't matter. Then you move from a source of real knowledge instead of optimistic hear-say.
Hi Mark,
The affect of a power supply is highly dependent on the circuit. Many times any reasonable power supply is indistinguishable from another (having tested this with real equipment). Obviously, a mis-matched power supply will affect the sound, as will a poorly designed one.
I'm a power supply engineer in real life - but I'm not going to bite on this project.
It's unlikely that Yamaha would tolerate someone cloning the appearance of their equipment,
and using their trade name, no matter how old the equipment is. If you actually start selling it,
they are likely to have their lawyers contact you with a cease and desist order.
and using their trade name, no matter how old the equipment is. If you actually start selling it,
they are likely to have their lawyers contact you with a cease and desist order.
Agreed. Sounds like "help me build alibaba yamaha clone".
This is not the first time this type of work has been conducted. Take a look at AudioKarma and you will see.
AudioKarma
Now there is a shinning example of rational thought!
You may run into terminal legal problems. Just saying.
Now there is a shinning example of rational thought!
You may run into terminal legal problems. Just saying.
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