Ok!
50V * sqr2 = 70,7V
I think that will work perfectly.
Don't forget to use a good bridge rectifier, axtra large capacity reservoir capacitors and, of course, a delayed start-up power switch (that one with resistors) to avoid the blowing of your house fuses 😀
P.M.
50V * sqr2 = 70,7V
I think that will work perfectly.
Don't forget to use a good bridge rectifier, axtra large capacity reservoir capacitors and, of course, a delayed start-up power switch (that one with resistors) to avoid the blowing of your house fuses 😀
P.M.
Keep in mind that when we give the power of our transformer they are given at 85°, it means that when it is cold the available power is more important and as we use a very special way of placing the rectifiers this enhances the power of the transformer (less saturation of the primary windings)!
Be patient a little and you will read early beginning of September the characteristics of the next 9-C series (PSS600 – PSS1200 and PSS 2400)!
Here is a brief description of the updates:
Beside several audiophile modifications (directly linked inputs for deeper and natural bass, new settings in the input filter for better treble and several other improvements such as new audio potentiometer without multi click, etc. …) there will be three new PSS amplifiers.
They will also use new electrolytic capacitors and it will also enhance their sound quality.
There is as much difference, between this new update (9C) and the previous model (9B), than the 9B amplifier and a … phonograph!
PSS600: Same PCB as PSS500 with 2x400 VA transformers and 80 000MF capacitors. This amplifier will deliver 2x300 Watts under 4 ohms and 2x150 Watts under 8 ohms, 1x600 Watts under 8 ohms in the bridged mode.
PSS1200: Same PCB as PSS1000 with 2x800 VA transformers and 80 000MF capacitors. This amplifier will deliver 2x600 Watts under 4 ohms and 2x300 Watts under 8 ohms, 1x1200 Watts under 8 ohms in the bridged mode.
PSS2400: This amplifier will be placed in a 3 units high rack with handles (other models will be kept in the actual 2 units rack high) and a very powerful 38 mm fan, same PCB as PSS2000 with 2x1600 VA transformers and 100 000MF capacitors. This amplifier will deliver 2x1200 Watts under 4 ohms and 2x600 Watts under 8 ohms, 1x2400 Watts under 8 ohms in the bridged mode.
Best regards
YG
www.pssaudio.com
Be patient a little and you will read early beginning of September the characteristics of the next 9-C series (PSS600 – PSS1200 and PSS 2400)!
Here is a brief description of the updates:
Beside several audiophile modifications (directly linked inputs for deeper and natural bass, new settings in the input filter for better treble and several other improvements such as new audio potentiometer without multi click, etc. …) there will be three new PSS amplifiers.
They will also use new electrolytic capacitors and it will also enhance their sound quality.
There is as much difference, between this new update (9C) and the previous model (9B), than the 9B amplifier and a … phonograph!
PSS600: Same PCB as PSS500 with 2x400 VA transformers and 80 000MF capacitors. This amplifier will deliver 2x300 Watts under 4 ohms and 2x150 Watts under 8 ohms, 1x600 Watts under 8 ohms in the bridged mode.
PSS1200: Same PCB as PSS1000 with 2x800 VA transformers and 80 000MF capacitors. This amplifier will deliver 2x600 Watts under 4 ohms and 2x300 Watts under 8 ohms, 1x1200 Watts under 8 ohms in the bridged mode.
PSS2400: This amplifier will be placed in a 3 units high rack with handles (other models will be kept in the actual 2 units rack high) and a very powerful 38 mm fan, same PCB as PSS2000 with 2x1600 VA transformers and 100 000MF capacitors. This amplifier will deliver 2x1200 Watts under 4 ohms and 2x600 Watts under 8 ohms, 1x2400 Watts under 8 ohms in the bridged mode.
Best regards
YG
www.pssaudio.com
ok, right.
i've 2 big 47.000uF caps anda right rect.
the delayed power switch is implemented soon.
regards
lenti
i've 2 big 47.000uF caps anda right rect.
the delayed power switch is implemented soon.
regards
lenti
i've simulated all 3 schem's with spice and i think the pss500 will work well with +/- 40V=, the pss1000 with +/- 75V= andthe pss2000 with +/- 90V=.
regards
lenti
regards
lenti
This thread is so ^$%$%$ annoying!
Get your ADVERTISEMENTS OUT OF HERE. You're advertising your worthless product and NOBODY WANTS TO HEAR ABOUT IT.
Lenti, why would you want to build this?? It's a run of the mill design lacking details and probably won't even sound that good.
And PSS audio boy, if you're so wonderful, why won't you tell him what the DC voltage is? Big company trade secret?
Sheesh.. Lame lame lame.
-- Aaron
Get your ADVERTISEMENTS OUT OF HERE. You're advertising your worthless product and NOBODY WANTS TO HEAR ABOUT IT.
Lenti, why would you want to build this?? It's a run of the mill design lacking details and probably won't even sound that good.
And PSS audio boy, if you're so wonderful, why won't you tell him what the DC voltage is? Big company trade secret?
Sheesh.. Lame lame lame.
-- Aaron
Agreed!arnach said:
But I am curious about heat with these amps. I see the PSS2000 is rated for a whopping 2000W bridged. Yet there is basically no heat sinking that I can see in the pictures. I've been struggling trying to squeeze adequate heat removal for 250W for each of 6 channels into a 4U case (with temp-controlled fans, too!). Yet you seem able to accomplish a similar feat with little sinking in a 2U case. The weight also seems very light, too. The 750VA toroidal Plitron models weigh 5.5kg each, and are rather large compared to the ones in the pictures.
Lenti, unless you have your heart set on this project, I'd have to suggest trying out a Leach amp, an ESP project, or a Pass Labs project. There should be links to all the sites on the diyaudio links pages.
Mark Broker
Mark,
About our unique cooling system, as a chief engineer with some experience as you seem to have, just by looking at it you should say: dam god why haven't I thought about it before!
Everybody is cooling the heat sink witch is cooling the transistors (with a lot of loss in the air pressure with long heat sinks, we have no loss and there is so much pressure that the amplifier is quite dust less as it is sent out of the box quite easily)!
As we use metal case transistors and not plastic transistors, we are cooling directly the cases of all the transistors and it reduces dramatically the size of the heat sink!
And it works just fine!
If you want to know more about it, read the article posted on our web site, practical advice page!
About the weight of your transformers, don't you know that there are good and medium quality manufacturers, any even bad ones too?
We use TOROID transformers, one of the most famous manufacturer for audio and they know how to make powerful transformer for a “little” weight (we are about to receive a new 1200VA transformer, still at 85° C, and it will weight “only” 6.5kg for 120mmx120mm)!
Our 750VA transformer (120mmx75mm) is rated when the transformer is hot (85° C); it means that when it is cold it can deliver 50% more.
And as we use a twin bridge, we can pull 50% more without any steel saturation on the primary windings (a very well known trick from audiophiles).
About the DC values, boys, please think a little:
We use 63V capacitors for PSS500, 80V for PSS1000 and 100V for PSS2000.
Guess then what are the DC voltages used in our amplifiers!
Best regards from France
Yuri GUTSATZ Jr.
www.pssaudio.com
About our unique cooling system, as a chief engineer with some experience as you seem to have, just by looking at it you should say: dam god why haven't I thought about it before!
Everybody is cooling the heat sink witch is cooling the transistors (with a lot of loss in the air pressure with long heat sinks, we have no loss and there is so much pressure that the amplifier is quite dust less as it is sent out of the box quite easily)!
As we use metal case transistors and not plastic transistors, we are cooling directly the cases of all the transistors and it reduces dramatically the size of the heat sink!
And it works just fine!
If you want to know more about it, read the article posted on our web site, practical advice page!
About the weight of your transformers, don't you know that there are good and medium quality manufacturers, any even bad ones too?
We use TOROID transformers, one of the most famous manufacturer for audio and they know how to make powerful transformer for a “little” weight (we are about to receive a new 1200VA transformer, still at 85° C, and it will weight “only” 6.5kg for 120mmx120mm)!
Our 750VA transformer (120mmx75mm) is rated when the transformer is hot (85° C); it means that when it is cold it can deliver 50% more.
And as we use a twin bridge, we can pull 50% more without any steel saturation on the primary windings (a very well known trick from audiophiles).
About the DC values, boys, please think a little:
We use 63V capacitors for PSS500, 80V for PSS1000 and 100V for PSS2000.
Guess then what are the DC voltages used in our amplifiers!
Best regards from France
Yuri GUTSATZ Jr.
www.pssaudio.com
Member
Joined 2002
PSS AUDIO said:
It's very easy to guess.😉 Since you push every aspect of a design to maximum I wouldn't be surprised if DC values for your amps would be 60V, 80V and 100V respectively.😉
JasonL said:
Do you have a problem with your keyboard or don’t you know how to write or speak any intelligible language?
It is perhaps the noise coming out of your system?
In such a case call a doctor, it is not that important and it can be fixed but do not wait too long.
Best regards
YG
Peter Daniel said:
Minus 10% for security!
Calculating those numbers are so easy that we do not give them. Having a little experience in building amplifiers, one can know +/- 5% the good value.
YG
Conservative design of PSU
Well my little experience in building amplifiers tells me that -20 % is a better deal. The lifetime of the cap is longer that way.
How hot do you run the caps ? this also leads to derating the lifetime of the PSU.
\Jens
PSS AUDIO said:
Well my little experience in building amplifiers tells me that -20 % is a better deal. The lifetime of the cap is longer that way.
How hot do you run the caps ? this also leads to derating the lifetime of the PSU.
\Jens
Only 10% Secure ?
Does your mains supply vary by as little as that ?.
I get television repairs where the 400V main cap has blown due to 240V mains running overvoltage. (285V AC ?).
I have also heard that main resevoir caps giver a shorter service life when operated at close to the rated voltage.
High ripple current further worsens this I believe.
For examples of the same manufacturer, type and capacitance, invariably the higher voltage rated electrolytic capacitor will exhibit lower ESR than a lower voltage rated example.
I feel that running supply caps 'close to the wind' is not optimum engineering practice.
Eric.
PSS AUDIO said:
Does your mains supply vary by as little as that ?.
I get television repairs where the 400V main cap has blown due to 240V mains running overvoltage. (285V AC ?).
I have also heard that main resevoir caps giver a shorter service life when operated at close to the rated voltage.
High ripple current further worsens this I believe.
For examples of the same manufacturer, type and capacitance, invariably the higher voltage rated electrolytic capacitor will exhibit lower ESR than a lower voltage rated example.
I feel that running supply caps 'close to the wind' is not optimum engineering practice.
Eric.
Caps
Hi Eric
I agree with you, I have also have had the main cap in TV's SMPS beeing shorted because of too small a rated voltage.
\Jens
Hi Eric
I agree with you, I have also have had the main cap in TV's SMPS beeing shorted because of too small a rated voltage.
\Jens
Re: Only 10% Secure ?
Eric,
What is the real quality of capacitors used in TV? Do you honestly think that a TV manufacturer will care about the audio quality and the real life time?
Was the capacitor rated 400V placed on the mains switch to avoid any switching noise? Such capacitors fails often not because of the voltage but because poor internal quality film is used!
But I'm not surprised about capacitors failure for bad voltage, as we already had in our hands capacitors labeled 100V and in fact they were only 63V...
About ESR you are wrong as BC COMPONENTS capacitors we use have an ESR of 35 for a 10 000MF 63V capacitor and an ESR of 70 for a 4700MF 100V capacitor (I hope you will agree that it is a quality manufacturer)!
Never forget that when a serious manufacturer gives his capacitor for xxx Volts it can handle 15% more.
And as we keep a 10% margin, so there we are with 25% margin, even better than the 20% suggested!
Do not forget too that the voltage given is to be compared with the ripple current (full voltage with maximum current).
As there is a decrease of 10% between loaded and unloaded voltage on the PSU, a capacitor can handle lifetime a bigger voltage with no current flowing trough it. It is the current flowing trough the capacitor that make him heat and so and so.
It is the same for a transistor (place a transistor of 80V in a circuit of 120V but without any current, or so little current that it won’t make it heat, and you will observe that this transistor will work perfectly for years!
Jens (I’m replying on the same board),
As we have a unique cooling system (dare have a look at it), with the "hot air" we get from the sides of our “small” heat sink, this air blows directly towards the capacitors, transformers and all power components!
With such a system, we also lower from about 15% their temperature ...
Isn't that clever (this is not promoting or advertising, it is just engineering) ...
Best regards
Yuri GUTSATZ Jr.
www.pssaudio.com
mrfeedback said:
Eric,
What is the real quality of capacitors used in TV? Do you honestly think that a TV manufacturer will care about the audio quality and the real life time?
Was the capacitor rated 400V placed on the mains switch to avoid any switching noise? Such capacitors fails often not because of the voltage but because poor internal quality film is used!
But I'm not surprised about capacitors failure for bad voltage, as we already had in our hands capacitors labeled 100V and in fact they were only 63V...
About ESR you are wrong as BC COMPONENTS capacitors we use have an ESR of 35 for a 10 000MF 63V capacitor and an ESR of 70 for a 4700MF 100V capacitor (I hope you will agree that it is a quality manufacturer)!
Never forget that when a serious manufacturer gives his capacitor for xxx Volts it can handle 15% more.
And as we keep a 10% margin, so there we are with 25% margin, even better than the 20% suggested!
Do not forget too that the voltage given is to be compared with the ripple current (full voltage with maximum current).
As there is a decrease of 10% between loaded and unloaded voltage on the PSU, a capacitor can handle lifetime a bigger voltage with no current flowing trough it. It is the current flowing trough the capacitor that make him heat and so and so.
It is the same for a transistor (place a transistor of 80V in a circuit of 120V but without any current, or so little current that it won’t make it heat, and you will observe that this transistor will work perfectly for years!
Jens (I’m replying on the same board),
As we have a unique cooling system (dare have a look at it), with the "hot air" we get from the sides of our “small” heat sink, this air blows directly towards the capacitors, transformers and all power components!
With such a system, we also lower from about 15% their temperature ...
Isn't that clever (this is not promoting or advertising, it is just engineering) ...
Best regards
Yuri GUTSATZ Jr.
www.pssaudio.com
Keeping them cool
How hot is the air tha flows over the caps ?
It looks to me that the caps are the last one that sees the
airflow. That means that the caps will run hotter than if they
were first in the "air chain"....that would be how I'd do it.
You system looks nice, but it does not seem that clever to mee.
Even when you run caps at - 15 % of their rated temp, it's still a major factor in the decrease of life for the cap.
I always say keep them as cool as possible !! 🙂
\Jens
How hot is the air tha flows over the caps ?
It looks to me that the caps are the last one that sees the
airflow. That means that the caps will run hotter than if they
were first in the "air chain"....that would be how I'd do it.
You system looks nice, but it does not seem that clever to mee.
Even when you run caps at - 15 % of their rated temp, it's still a major factor in the decrease of life for the cap.
I always say keep them as cool as possible !! 🙂
\Jens
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