He says if I don't understand French (which I don't) to down load the pdf and translate it. Do you know what pdf he is referring to?
FWIW, there was a lot of ink spilled over this PSU design and its cousins. There were tests of the amount of capacitance, ESR, wiring inductance, theory and experiments, warnings about oscillations and how to avoid them, etc.. None of it was done willy-nilly.
Some of the basic conclusions were:
Some of the basic conclusions were:
- Series resistance (ESR) affects the highs more than capacity. Lower ESR equals smoother and more realistic. None, if any, effect in the low end.
- Mids and lows are affected only by the amount of the capacitance, with no limit found to the improvement (at least for a preamp). More capacitance gives a subjectively smaller amount of bass, but cleaner & more stable.
Hi Scott,
Download a pdf reader,install, then open one of the links i posted and then right click mouse-print whole doc-then from the left of the screen modify from hardware printer to "save as pdf"and voila. And if you use ubuntu 16.04 like me, same steps, but this time print it from the browser settings button. 😉
Download a pdf reader,install, then open one of the links i posted and then right click mouse-print whole doc-then from the left of the screen modify from hardware printer to "save as pdf"and voila. And if you use ubuntu 16.04 like me, same steps, but this time print it from the browser settings button. 😉
I got a message back they can make me either 350va or 650va.
Should i just make it simple:
650va
230v 50hz voltage input
Outputs: 1 x 21volts? They can do 2 x 21volts? You think the voltage should be more? i can ask for 22 and 24 volts?
I thought it would be just simply 230volts in and then one 21volts ac out.
Let me know so i can order it.
So i shouldn't ask for a secondary winding of 12volts? Buy a separate transformer for that?
if i use two seperate r cores how does that work? would they be connected together or would i got the dual mono route?
Should i just make it simple:
650va
230v 50hz voltage input
Outputs: 1 x 21volts? They can do 2 x 21volts? You think the voltage should be more? i can ask for 22 and 24 volts?
I thought it would be just simply 230volts in and then one 21volts ac out.
Let me know so i can order it.
So i shouldn't ask for a secondary winding of 12volts? Buy a separate transformer for that?
if i use two seperate r cores how does that work? would they be connected together or would i got the dual mono route?
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Thank you. I shall see what I can manage to do. I'm afraid my IT skills aren't great and I only have a chromebook which runs chrome OS and is quite limited when it comes to programs etc. Thanks again for your help
That seems high. If your UK mains are 240V then you'll be at 22VAC out.
What's that going to be once rectified and filtered into DC? What's your rail voltage supposed to be, 24V.
And you need a center tapped transformer.
UK mains is 240v apparently, i just measured it at 236v. Well Pano the rail voltage can be 24v or higher. From advice on here i've been advised to stick to 24v. So i'm guessing 24v +- a couple of volts over wont make that much of a difference?
R Core center tapped?
Hello,
Better have an R core like i described so you can change the dc voltage to the circuit by changing primary or secundairy connection. You NEED a centre tap so 21-0-21. BUT ask for one with more taps!
You could use.a seperate transformer ( 100 VA or so) for the part that has a regulated power supply.
Greetings, Edsuard
Better have an R core like i described so you can change the dc voltage to the circuit by changing primary or secundairy connection. You NEED a centre tap so 21-0-21. BUT ask for one with more taps!
You could use.a seperate transformer ( 100 VA or so) for the part that has a regulated power supply.
Greetings, Edsuard
This is more cleaner than i could explain. Every bit of what you sayed is true. I have readed all of them, and experienced some of these points. Thanks Pano.
In terms of sound quality, I have to say that its pretty hard to say wich amp is better than the other. I have readed that Kaneda is better than the Hiraga's series in bass but in rest not that much. The Hiraga's series sounds more powerfull than they really output wereas the Kaneda didnt + the Kaneda was pretty hard to keep stable, and a key point was a bellow 1% matching on almost all components and some of the components where almost impossible to find.
Here it is a comparison bettween L'audiophille realisations:
L'amplificateur Kanda . L'aspect subjectif (J.Hiraga)
BUT Hiraga himself made a top, based on his sound preferences:
1. a we300b amplifier;
2. super nemesis compensee (very very close to the we300b);
3. le monster;
4. hiraga 20watter (he liked the warmth of this amp, tubey like); -it has second order harmonics;
5. kaneda series amps with the originall 2sk30agr (he liked the bass but didnt like the complexity and the input sensitivity);
5'. hiraga 30watter (he liked the finess, and his ability to reproduce the voices with such reality, and the overall simplicity of the schematic);
The last two of them had composed second and third harmonics.
Cheers
Sergiu
I found something four years ago, but now i dont need it anymore. I understand french pretty well i think.🙂
ok so to sum it up:
Primary 120-115-0-115-120 so you can change output by using 230 or 240 volts in.
Secondary 21-0-21 at 3-4amps? or have more taps so 24-21-0-21-24
I wanted 12v to power devices such as the soft start or speaker protection.
Eduard is right, Vishalk, if you want to go stock a 18v-0-18Vac center tap trafo will give you a 24-0-24Vcc on load. I have a 24-0-24 Vac, but made 21-0-21Vac taps and get an almost 28Vcc in loading and 38W sinus output at 1.65A bias.
Your choice.
If you want 24 volt DC rails, you don't want 24V tranfo taps. 21VAC is already going to result in about 29VDC. There will be some drop thru the filtering resistor or choke. You'll need to burn off 4 or 5 volts.
I went a little high on the voltage with my first build. Worked OK but eventfully killed the output transistors. I might have been able to avoid that with a better bias adjustment, but I didn't.
I went a little high on the voltage with my first build. Worked OK but eventfully killed the output transistors. I might have been able to avoid that with a better bias adjustment, but I didn't.
I would preffer primary 120-115-0-115-120 so you can change output by using 230 or 240 volts and 24-21-18-0-18-21-24 so you can see and play abit longer with the amp configs. If you go custom it will be good to do this. At 650va primary you will get at least 10A in the secondaries.
AndrewT uses a very good and simple equation wich i measured and tested: Vac (from trafo) *1.414=Vcc obtained with no load. Then Vcc obtained - almost 1V if using 1.5A bias and 24Vcc or -1.5V if using a higer bias.
So lets say a 18Vac*1.414=~25.5Vcc(no load)-1V (with 1.5A bias)=~24vcc on load considering a lower mains input (i was suppose to have 220Vac but measured almost 218 in the day and almost as low as 216 in the afternoon, wich automatichally lowers the bias and output power)..
So lets say a 18Vac*1.414=~25.5Vcc(no load)-1V (with 1.5A bias)=~24vcc on load considering a lower mains input (i was suppose to have 220Vac but measured almost 218 in the day and almost as low as 216 in the afternoon, wich automatichally lowers the bias and output power)..