Gotta love how he answers questions that don’t sell his products!
@housepianist
4 күн бұрын
I had to chuckle at Paul when his dual audiophile nature came out at the beginning: Letter: “Hey Paul, I’m building my first amplifier.” Paul: “Good work, sir! I love it. Do-it-yourself hobbyist. Excellent!” Letter: “It’s a Bridge TDA7294 chip amp style.” Paul: “Ehhh, yeah. Well, fun project…” An audio enthusiast and critic at the same time. Love it. 😂👍
@BruceCross
4 күн бұрын
Ha, Paul clearly wasn't impressed, but he bit his tongue.
@babubabu12345
5 күн бұрын
Paul sir has explained the matter very well...🙏
@glenncurry3041
5 күн бұрын
One of my stories yet again from back in the day. In the mid '70's I did a travelling "High Speed" amp clinic measuring the rise time and slew rate at rated power of any device brought into which ever store I was visiting that day. 10Khz squarewave in, full power out into an 8ohm dummy load. Sony had just released switching PS in some products. Everyone of them I benched went up in smoke! I had to stop testing any such Sonys. Outside of one DYI from a local Tech School in Tn that had a class on amp building, they were the only one's that fried. Some others did shut down, but not literally smoke!
@iblesbosuok
5 күн бұрын
Open loop SMPS performs quiet close to mains frequency transformer PS. SMPS reduces material, weight and volume. Switching noise can be filtered out with snubber, a combination of capacitor-inductors arrangements and proper neutral path pattern draw. That's for beginners.
@alejandrorigonatto694
5 күн бұрын
I will make an independant metal grounded chassis for EMI too... Like Faraday taught us to... 😊
@stijnvanderlooy5311
5 күн бұрын
Very nice and truthful explanation
@tacofortgens3471
5 күн бұрын
I agree with bigger output caps ito handle the peak dunamics better
@csoapy
4 күн бұрын
GaN(gallium nitride) Amplifier, Class-D of course, will be the winner in future. Some chips and productions are already on the market about several years ago
@MrDingaling007
5 күн бұрын
I know someone that uses toroidal transformers to power hypex class D amps. Wonder if there is a noticeable difference/improvement.
@ThinkingBetter
5 күн бұрын
Nice answer. I like that my power amplifier can output the power of near clipping level without relying on capacitors to maintain the power rail voltage. I rather have an SMPS able to continuously deliver the max power the amp can output than have some solution with capacitors used to help maintain the voltage due to a weak linear transformer. But obviously that is only true if that SMPS has very low output noise.
@alejandrorigonatto694
5 күн бұрын
Output noise you can filter off... The most trouble of SMPS is the electromagnetic radiated energy, at high frecuency and when consumption goes up pcb tracks acts like antennas radiating energy everywhere... I think most people overlook that because is mostly noticeable when the supply get pushed hard... And i think the capacitor bank at the output of the will help with the line noise also with the peak consumption, OFC that doesn't mean that you will put an SMPS smaller that the max amp power rating, in fact it actually needs to be 30% better to ensure durability and stability (Most SMPS gain a bad reputation with people that wanna use them as lineal transformers who can give a little extra momentaneus peak of current, SMPS are electronics, and as an amp or any electronics need to work with a safe margin from the "Absolute Maximum Rating" stated in the datasheet, that is usually at 70-75% of his max capabilities)
@ThinkingBetter
5 күн бұрын
@@alejandrorigonatto694 Agree. Whatever is the max output power is a subset of the input power from the power supply thus you need to add that and the extra margin (wasted power) is less for class-D and most for class-A. As speaker impedances can dip depending on frequency, perhaps down to near 2 Ohms in some extreme cases, ideally your SMPS can output the equivalent power needed for a 2 Ohm load plus the power losses inside the amp.
@robertmoi8400
4 күн бұрын
I recently scavenged an SMPS, with rated DC voltage as my DAC, from an over 20-year-old VHS player and tried it on my DIY DAC. I was astonished. The noise and hum that had plagued my system was gone. the noise went from being audible at half a foot from the speakers to only being audible from the tweeter at ear-to-the-speaker distance. The SMPS looks well-designed with a grounded metal cage. It performs better than a regulated linear PS that I designed(I am new to electronics). With a Chinese SMPS, I could not float the DAC ground but with the new SMTP, I can float the whole system with no audible difference. The new SMPS might have some filtering circuit and the Chinese one might have internal noise that needs to be earthed. Japanese are really good electronics designers. The low high-frequency noise might be caused by my amp which is a powerful class AB pro-based design but has poor quality parts. carbon and ceramic resistors with steel legs. I'll replace it soon. Upgrades remaining on my ESS9038Q2M-based DAC are a new clean 3.3v AVCC op-amp-based filtered voltage supply and either a new output stage with quality parts and replacement of NE5532 op amp or finding a good volume control for my tube DAC and using it as output stage. Thanks to Paul and other sources, I have been able to learn electronics and get hands-on with them in less than a year.
@36karpatoruski
4 күн бұрын
Weren’t the old Carver amps in the 80’s SMPS?
@Roosville1
4 күн бұрын
Transformer efficiency is 99%+ You have to ask, what is the "Power Supply rejection ratio" at the frequency of the power supply noise being made. For a mains transformer, this is 100Hz/120Hz with some edge speed from rectification. With SMPSU, this is a much higher frequency 40Khz and up, and up. Power amps struggle to reject power supply noise as the frequency increases. It's easy enough to design a low noise SMPSU, but it takes cash, something the industry mysteriously never wants to spend.
@chisin6380
3 күн бұрын
Class A/B with Switch Mode PS, Class H?
@funny0000000
5 күн бұрын
On his cheap little amp project I don't think he will get a good enough switch mode power supply to make it worth it. It will have way more in to the power supply than the whole amp is worth. If it is just a project I am all for putting way more money in to something than it is worth but if he thinks he is going to get something amazing for cheap then don't spend you money.
@tacofortgens3471
5 күн бұрын
They will sound pretty good,, caps arent that expensive to replace, mayne a couple of dollars. And with that it teaches you tjings. Start with the basic kit, play muskc , replace the output capa and add higher microfareds in them and see if the dynamics improve and sound stage sounds better
@thinkIndependent2024
5 күн бұрын
Have investigated Emotivia ? 2k watts of power plant .If you build try it !! Personally I experimented and built over 40 in various current outputs . What I discovered ? Both in-band and out-band noise can be mitigated to negligible. (Better than Batteries) Reference Robb Watts of CHORD Electronics for more details on the "Myth of Linear Power Supplies"
@CraftyZA
5 күн бұрын
death to all switch mode power supplies in audio Just go linear dude. What Paul did not mention is that the life expectancy of SMP supplies is much less. Build a proper linear and it will outlive you. Maybe a cap change in 20 or 30 years. SMPS destroys it self in 5 to 10 years. If you really, really want to use that antec, Paul mentioned to add some fat caps. I would go further, and say to include a fat 6mH choke before the caps. For the caps, rather rather add smaller caps in parallel since the smaller caps have lower ESR This way you can deal with some of the noise, but this will not solve longevity, and it will not be as quiet as a linear supply
@thinkIndependent2024
5 күн бұрын
I just make the SMPS module swappable , in the long run the isolation from the other components help lower noise also( A new way to solve an old problem much cheaper)
@alejandrorigonatto694
5 күн бұрын
Ofc you will said that... You probably use an SMPS of 500w for a 500w amplifier... Most people don't consider amp efficiency in supply selection, also SMPS are electronics so they can't go full load, if you get a supply 30% more than the power requirements (the total, including the losses due to efficiency) and make sure it was nicely vented to not heat (heat is electrolitic caps worst enemy) I think you can actually reuse your old supply if you do a regular Recap on that...
@AA-dd5kn
5 күн бұрын
You’re up late😮
@jvandeplasse
5 күн бұрын
Can’t sleep!
@alejandrorigonatto694
5 күн бұрын
Or too early 😂
@jorgebravo7980
5 күн бұрын
Switch mode power supply is just another way to say Class D amplification, right?
@amcore6281
5 күн бұрын
no.
@andymill8552
5 күн бұрын
@jorgebravo7980 : No. Power supplies and the device it powers are 2 separate things. There are lots of class AB amps with a SMPS as well. There are also class D amps with linear power supplies. Also your phone charger is a switched mode power supply. Power supply topology has nothing to do with the type of amplifier used.
@Bill.K
5 күн бұрын
No, Class D refers to the operational class of the output stage which can have either a linear or switched mode power supply design.
Пікірлер: 33