No.
The output current of most ClassA amplifiers modulates the rail currents.
For each Ampere peak sent to the load, the supply rails see an increase and a decrease of half an ampere peak.
If 25W sinewave is being sent to an 8r0 test load, then the peak output current is 2.5Apk
The change in supply rail currents are +-1.25Apk.
If a transient into a reactive speaker draws 10Apk then the rails see +-5Apk.
Stop telling Members that ClassA is constant current.
I will stop to say anything, when mummy or daddy tell me that.
Anyway I will be obedient with your order today!
But I said ALMOST! constant. Thanks by your clear explanation, Thanks to this forum I getting more information.
And If you are as erudite and teacher as want, try to be patient and kindly with this class of ignorant people like me.
Please Sir like I am with every body.
I tried to be more direct and handsome-less by PM but your mailbox is full
Best Regards.
Anyway I will be obedient with your order today!
But I said ALMOST! constant. Thanks by your clear explanation, Thanks to this forum I getting more information.
And If you are as erudite and teacher as want, try to be patient and kindly with this class of ignorant people like me.
Please Sir like I am with every body.
I tried to be more direct and handsome-less by PM but your mailbox is full
Best Regards.
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Looks like SMPS500Rv2 is DoD.
Hi Cristi:
The SMPS500Rv2 I received this week looks like dead-on-arrival. Would it be possible to get a cross shipment of the replacement unit ASAP with quick delivery time?
On the picture black is 'Live', yellow is 'earth' and white (with black isolation tape on it) is 'neutral'. It is the same order as marked on the bottom of the PSU. Is wiring correct? I get 0.018mDC on Aux and 0.056mVDC on main output. I expected to see light from LED1 as per the schematic and do not see it on the powered PSU.
I placed the order on 02/27/14 and got the unit on 04/16/14. Now I finally got to powering the unit, and it appears dead-on-arrival unless I mix something. Unfortunately due to almost 7 weeks delivery time, I am getting close to the end of CC transaction dispute window, so I had to open a dispute with my AxEx and would happy close the dispute once a solution is determined.
/D
Hi Cristi:
The SMPS500Rv2 I received this week looks like dead-on-arrival. Would it be possible to get a cross shipment of the replacement unit ASAP with quick delivery time?
On the picture black is 'Live', yellow is 'earth' and white (with black isolation tape on it) is 'neutral'. It is the same order as marked on the bottom of the PSU. Is wiring correct? I get 0.018mDC on Aux and 0.056mVDC on main output. I expected to see light from LED1 as per the schematic and do not see it on the powered PSU.
I placed the order on 02/27/14 and got the unit on 04/16/14. Now I finally got to powering the unit, and it appears dead-on-arrival unless I mix something. Unfortunately due to almost 7 weeks delivery time, I am getting close to the end of CC transaction dispute window, so I had to open a dispute with my AxEx and would happy close the dispute once a solution is determined.
/D
Attachments
Yikes! Your a.c. wiring looks scary. Are you an electrician or something? 😀
I guess you have 115V and not 230V then!
I guess you have 115V and not 230V then!
DMM shows 124VAC. It's a temporary wiring on a bench to check out the PSU. I did have to put the isolation tape on the neutral to prevent shots from wiggling of wires.
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SMPS Default mains voltage 120V
Dmitry: If you ask here I bet nobody will ever give you a competent answer, you will just see speculations of all kind so why you not read the product description and try to understand what it means: Connexelectronic
Half Bridge resonant SMPS capable of delivering 500W continuous and 650W peak power. the stock available output voltages are adjustable within +-10% range. It uses zero-voltage switching half bridge resonant topology. The main advantage is lower size and cost compared with a similar regulated SMPS and better efficiency, up to 95% compared with the regulated SMPS's due to the fact that the transistors are soft-switched, and the current through the switches has sinusoidal shape, and there are no output inductors. The SMPS features overcurrent protection which limit the output current at about 130% of the maximum peak power, about 800W. For best performances, there are two power supply versions, one for 110V mains supply voltage and one for 230V mains voltage, knowing the fact that some universal mains power supplies rely on voltage doubling when is used with 110V input, this lowering the global efficiency and maximum power capability. This power supply is suitable for both class AB and class D/T amplifiers, which have the PSRR greater or at least 54dB. Dedicated version board is used for 230V mains voltage and 120V mains voltage. The boards are almost identical, the main difference is the mains side bulk capacitor one single large capacitor for 230V version and two smaller capacitors connected in series for 120V version, which is also 230V mains voltage compatible. For 120V mains voltage, a jumper must be placed on a designated position by defauly the jumper is not placed allowing the maximum mains voltage to be used and prevent mistakes if is configured for 120V and supplied at 230V. Target applications for this power supply unit include the TA3020 based amplifiers and IRS2092 amplifiers for the +-54V version and multiple TDA892x or TA2022 amplifiers for the +-27V or +-31.5V version.
Regarding shipping, why don't you fill a claim with the local post or SE post? I posted the parcel in the same day when the order was placed. RE909992078SE Direct Link Then registered 10 days later when arrived at singapore hub. The parcel has posting date. All the shipping from china to rest of the word are terribly slow now except those within ebay global shipping program which also cost few times less than anything else. we are not using china post and HK post anymore for same reasons, their shipping time was ~6-10 weeks and lost one of 5 parcels last time we used them. order from distributors or someone who sells on ebay if you don't want to understand that I cannot control the shipping and also don't want to pay few $ more to have it shipped with DHL.
Also, customers involved in disputes, no matter what is the outcome will be banned from future purchase. Just getting tired to do all the dirty work of fighting for my money instead of concentrating on the work itself.
For Kris0603 and rest of the guys: SMPS300RE has limited power during star-up to prevent any damage on the amplifier supplied if something went wrong or excessive current is drawn. adding one single 0.47-1uF cap from pin 2 to GND of the controller will increase the current capability and the SMPS300RE can start with 4700-10000uF per rail and 1-2A quiescent current. who don't believe, can try. just don't damage the SMPS if your soldering skills are not good enough and complain that was doa.
And I expect an explanation for your statement of "false advertisement".
Dmitry: If you ask here I bet nobody will ever give you a competent answer, you will just see speculations of all kind so why you not read the product description and try to understand what it means: Connexelectronic
Half Bridge resonant SMPS capable of delivering 500W continuous and 650W peak power. the stock available output voltages are adjustable within +-10% range. It uses zero-voltage switching half bridge resonant topology. The main advantage is lower size and cost compared with a similar regulated SMPS and better efficiency, up to 95% compared with the regulated SMPS's due to the fact that the transistors are soft-switched, and the current through the switches has sinusoidal shape, and there are no output inductors. The SMPS features overcurrent protection which limit the output current at about 130% of the maximum peak power, about 800W. For best performances, there are two power supply versions, one for 110V mains supply voltage and one for 230V mains voltage, knowing the fact that some universal mains power supplies rely on voltage doubling when is used with 110V input, this lowering the global efficiency and maximum power capability. This power supply is suitable for both class AB and class D/T amplifiers, which have the PSRR greater or at least 54dB. Dedicated version board is used for 230V mains voltage and 120V mains voltage. The boards are almost identical, the main difference is the mains side bulk capacitor one single large capacitor for 230V version and two smaller capacitors connected in series for 120V version, which is also 230V mains voltage compatible. For 120V mains voltage, a jumper must be placed on a designated position by defauly the jumper is not placed allowing the maximum mains voltage to be used and prevent mistakes if is configured for 120V and supplied at 230V. Target applications for this power supply unit include the TA3020 based amplifiers and IRS2092 amplifiers for the +-54V version and multiple TDA892x or TA2022 amplifiers for the +-27V or +-31.5V version.
Regarding shipping, why don't you fill a claim with the local post or SE post? I posted the parcel in the same day when the order was placed. RE909992078SE Direct Link Then registered 10 days later when arrived at singapore hub. The parcel has posting date. All the shipping from china to rest of the word are terribly slow now except those within ebay global shipping program which also cost few times less than anything else. we are not using china post and HK post anymore for same reasons, their shipping time was ~6-10 weeks and lost one of 5 parcels last time we used them. order from distributors or someone who sells on ebay if you don't want to understand that I cannot control the shipping and also don't want to pay few $ more to have it shipped with DHL.
Also, customers involved in disputes, no matter what is the outcome will be banned from future purchase. Just getting tired to do all the dirty work of fighting for my money instead of concentrating on the work itself.
For Kris0603 and rest of the guys: SMPS300RE has limited power during star-up to prevent any damage on the amplifier supplied if something went wrong or excessive current is drawn. adding one single 0.47-1uF cap from pin 2 to GND of the controller will increase the current capability and the SMPS300RE can start with 4700-10000uF per rail and 1-2A quiescent current. who don't believe, can try. just don't damage the SMPS if your soldering skills are not good enough and complain that was doa.
And I expect an explanation for your statement of "false advertisement".
Hi Cristi, thanks for your explanation, i thought it was pin 1 to GND. I said "borderline false advertising", so it's not quite there imho. The reason for it is that the SMPS as designed has a narrow window of capacitance at its output that it will accept, and my argument is that this window precludes most sensible Class AB amps from being used directly.
Cristi, i think you make great supplies, but how much do you reckon a modified SMPS300RE with clamper diodes across the primary resonant tanks would cost? I would happily pay 70 or 80 or more for an SMPS(and accept a larger board) which had this type of overcurrent control(still just as safe as your current implementation when shorted), but with an unlimited capacitance at the output, and the added benefit of less stress on the resonant tank capacitors.
It's a risk to develop such a SMPS, but i know a lot of people would buy it for their projects.
Just my 2c.
Warm Regards,
Kris0603
Cristi, i think you make great supplies, but how much do you reckon a modified SMPS300RE with clamper diodes across the primary resonant tanks would cost? I would happily pay 70 or 80 or more for an SMPS(and accept a larger board) which had this type of overcurrent control(still just as safe as your current implementation when shorted), but with an unlimited capacitance at the output, and the added benefit of less stress on the resonant tank capacitors.
It's a risk to develop such a SMPS, but i know a lot of people would buy it for their projects.
Just my 2c.
Warm Regards,
Kris0603
I found this highly enlightening:
http://scholar.lib.vt.edu/theses/available/etd-09152003-180228/unrestricted/Ch5.pdf
It is a paper about improvements to the LLC converter. Maybe you already knew everything i it, but perhaps it's useful for others to understand what i'm talking about specifically with the clamper diodes.
It's on page 174 under heading 5.2.4, "Method 3: LLC resonant converter with clamping diode"
All the best,
Kris0603
http://scholar.lib.vt.edu/theses/available/etd-09152003-180228/unrestricted/Ch5.pdf
It is a paper about improvements to the LLC converter. Maybe you already knew everything i it, but perhaps it's useful for others to understand what i'm talking about specifically with the clamper diodes.
It's on page 174 under heading 5.2.4, "Method 3: LLC resonant converter with clamping diode"
All the best,
Kris0603
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I purchased the unit for 120V mains in the US. Why is not the unit jumper configured correctly for the 120V voltage or why did you fail to note that in the manual, which I read?
Apparently the available version of the manual for SMPS500R (http://www.connexelectronic.com/documents/SMPS500R.pdf) and attached to this post does not reference either 'Jmp' or 'Jumper'. Also the documentation is not updated for v2 of the unit including outdated pictures.
You failed to comprehend the note. The order was paid to Cristian on 02/27/14 and received on 04/17/14 in the US. The only way it takes so long is if the package travels by sea. The shipping charge was $25.99.
> Also, customers involved in disputes, no matter what is the outcome will
> be banned from future purchase. Just getting tired to do all the dirty
> work of fighting for my money instead of concentrating on the work
> itself.
The good news Connex Electronics products are easy to substitute. After dealing with Connexelectronic above, it is not worth dealing with for me. The lower prices are not worth the savings given time has to be wasted on tracking 7 weeks long shipments, mitigating the risk of lost shipment given 45 days limit on claims by PayPal, and reaching out on forums to figure out why the product is neither properly configured for the ordered mains voltage nor correctly documented.[/QUOTE]
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But why? The attached version of the manual from Connexelectronic did not contain a copyright notice.
What??
> Also, customers involved in disputes, no matter what is the outcome will
> be banned from future purchase. Just getting tired to do all the dirty
> work of fighting for my money instead of concentrating on the work
> itself.
Is this guy for real??
His power supply has taken an age to get to it's destination. It arrives DOA due to his miscommunication (or perhaps due to a faulty board), then he has the gall to blame the customer. He doesn't seem interested in helping to get the board working! In his statement above he may as well be saying "the customer is always wrong". And what sane person would NOT file a dispute when dealing with this? It may be their only means of getting things sorted!
I have been looking at purchasing some Connextronics amplifiers. Well forget it! Poor specifications and documentation, less than transparent correspondence, and now confirmed rubbish customer service.
His antics speak for themselves.
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dsolodov: pls tell me what you meant to say in the message which you sent me:
The SMPS is NOT DOA like some of you want to believe. was just simply not configured for 120V mains use. reasons were explained but not many bother to read.
Interesting that all these discussions came around the time when I was questioning the performances and allegation of a competitor product in another thread, which is extremely active at least promoting the business.
For the rest of you who think that disputes are necessary you are free to try your luck with other sellers. I've been tolerant enough in the past years and had customers which purchased 4 times and opened dispute at each purchase about few days after the parcel was shipped and traceable just to be sure he is covered in case it doesn't arrives. 4 times not once or twice. then he was very pissed off why I deleted his account before the fifth attempt.
Not only end-users do such things, recently I dealt with some phantom company which ordered a lot of boards for "evaluation" in 3 separate orders. in all this time were keep complaining about products prices and shipping prices. after the boards arrived and saw that there is no way to get them cheaper or extra boards in the same price they disputed all transactions. it is definitely a scam and I contacted authorities to take this over. once the things are over I will make the company identity public to prevent them to scam others.
I am not a scalper who buy here and sell there, I designed all what we sell, I run our small factory, and although I have employees to do the job I keep an eye on each board which is assembled and tested, on each package which is posted and anyone who consider to dispute a transaction for whatever reason should never do business with my company. I've been scammed too many times already. I consider to stop using paypal for payment and even stop selling to end-users, only to distributors.
Shipping time is something which I cannot control and if one refuse to understand this aspect, find another product in another place. recently all the sellers which are not shipping through ebay global shipping program have same issues or even worse. we offer DHL shipping upgrade but most of the customers don't want to have their order shipped with DHL and keep complaining why the standard shipping which they chose take so long while refusing to use a faster shipping. for those of you who don't know, since ebay and chinese shipping companies made the famous global shipping deal, there is almost no way to send out something and take less than 3-4 weeks to arrive except fast couriers like DHL UPS and others which are cost prohibitive for small orders and charge import taxes automatically. selling through ebay is not an option at the moment and it doesn't match our business profile, for the same reason why other companies who design and produce in house doesn't sell on ebay.
Most of the products which we sell have detailed manuals or at least comprehensive description on the product page. I saw countless times the same questions which have the answer in manuals over and over again. some ppls prefer asking on forums but don't bother to spend 10 min reading the product manual. and 99% of the answers which they receive are totally wrong or out of topic. while most of the competitors products are trying their best to hide the inside details, some of them by using unmarked or grinded components, I did the opposite: the first products manuals were all containing board schematic with components values. instead appreciation, this has triggered a wave of complaints when different versions were made with different components values. I had complaints why the gerber files aren't available and transformer manufacturing details. I have to remind you that all these infos are impossible to get from any other competitor product with their agreement. I was the first and probably the last who published a complete schematic of a SMPS for audio or powered class D amplifier.
Seems silly to see complains from ppls who usually buy things on ebay or chinese websites where the product description is limited to 50-100 words, most of them with funny spelling, no product manuals, inflated specs and where there is no customer support at all from the seller side because "we no english" and have to fill the forums with countless basic questions to have them up and running.
If any of you guys are just polluting the thread and I'm gonna step out from this conversation.
dsolodov said:
The SMPS is NOT DOA like some of you want to believe. was just simply not configured for 120V mains use. reasons were explained but not many bother to read.
Interesting that all these discussions came around the time when I was questioning the performances and allegation of a competitor product in another thread, which is extremely active at least promoting the business.
For the rest of you who think that disputes are necessary you are free to try your luck with other sellers. I've been tolerant enough in the past years and had customers which purchased 4 times and opened dispute at each purchase about few days after the parcel was shipped and traceable just to be sure he is covered in case it doesn't arrives. 4 times not once or twice. then he was very pissed off why I deleted his account before the fifth attempt.
Not only end-users do such things, recently I dealt with some phantom company which ordered a lot of boards for "evaluation" in 3 separate orders. in all this time were keep complaining about products prices and shipping prices. after the boards arrived and saw that there is no way to get them cheaper or extra boards in the same price they disputed all transactions. it is definitely a scam and I contacted authorities to take this over. once the things are over I will make the company identity public to prevent them to scam others.
I am not a scalper who buy here and sell there, I designed all what we sell, I run our small factory, and although I have employees to do the job I keep an eye on each board which is assembled and tested, on each package which is posted and anyone who consider to dispute a transaction for whatever reason should never do business with my company. I've been scammed too many times already. I consider to stop using paypal for payment and even stop selling to end-users, only to distributors.
Shipping time is something which I cannot control and if one refuse to understand this aspect, find another product in another place. recently all the sellers which are not shipping through ebay global shipping program have same issues or even worse. we offer DHL shipping upgrade but most of the customers don't want to have their order shipped with DHL and keep complaining why the standard shipping which they chose take so long while refusing to use a faster shipping. for those of you who don't know, since ebay and chinese shipping companies made the famous global shipping deal, there is almost no way to send out something and take less than 3-4 weeks to arrive except fast couriers like DHL UPS and others which are cost prohibitive for small orders and charge import taxes automatically. selling through ebay is not an option at the moment and it doesn't match our business profile, for the same reason why other companies who design and produce in house doesn't sell on ebay.
Most of the products which we sell have detailed manuals or at least comprehensive description on the product page. I saw countless times the same questions which have the answer in manuals over and over again. some ppls prefer asking on forums but don't bother to spend 10 min reading the product manual. and 99% of the answers which they receive are totally wrong or out of topic. while most of the competitors products are trying their best to hide the inside details, some of them by using unmarked or grinded components, I did the opposite: the first products manuals were all containing board schematic with components values. instead appreciation, this has triggered a wave of complaints when different versions were made with different components values. I had complaints why the gerber files aren't available and transformer manufacturing details. I have to remind you that all these infos are impossible to get from any other competitor product with their agreement. I was the first and probably the last who published a complete schematic of a SMPS for audio or powered class D amplifier.
Seems silly to see complains from ppls who usually buy things on ebay or chinese websites where the product description is limited to 50-100 words, most of them with funny spelling, no product manuals, inflated specs and where there is no customer support at all from the seller side because "we no english" and have to fill the forums with countless basic questions to have them up and running.
If any of you guys are just polluting the thread and I'm gonna step out from this conversation.
Right gentlemen, diyA is not the place to solve private disputes, so this matter is closed. Any attempt to reopen this discussion will involve bin time for those concerned.
Hope i'm not overstepping any boundaries set by pinkmouse, but i just wanted to chime in that i successfully connected my stock SMPS300RE to my pair of Fetzilla boards, with a total of 3.000uF per rail (6.000uF in total) and it worked like a charm. Bass output is pretty darn good, more experimentation to follow!
Hi Cristi,
I think I've read somewhere in this forum that you can deliver from Europe.Is this true?
Regards Mikvous
I think I've read somewhere in this forum that you can deliver from Europe.Is this true?
Regards Mikvous
I can recommend Audiophonics, they can communicate well in English, they are very thorough and pack items carefully. Also very speedy. I believe Cristi has stated that he prefers not to sell items directly to customers.
HI Cristi,
I have a question or two about the TDA8950 Amp V3.
The PDF if for an older PCB and discusses mounting the heatsink etc, does the v3 come mounted on a heatsink as in the photo?
What are the output specs of the v3, at 4 & 8 ohm stereo, and BTL?
Does the PCB just require AC, ie rectifiers onboard? and what spec transformer would be suitable?
Many Thanks
Ian
I have a question or two about the TDA8950 Amp V3.
The PDF if for an older PCB and discusses mounting the heatsink etc, does the v3 come mounted on a heatsink as in the photo?
What are the output specs of the v3, at 4 & 8 ohm stereo, and BTL?
Does the PCB just require AC, ie rectifiers onboard? and what spec transformer would be suitable?
Many Thanks
Ian
Ian,
Not sure what you mean by v3 but I've had the TDA8950TH for a couple years now.
It has the heatsink already installed and needs only AC to power it up.
I'm running it in BTL mode and it puts out 210 watts rms into 8 ohms. Actually
less (130 w.) at 4 ohms. Stereo it's 105 each channel @ 4 ohms. It's an amazing little amp/smps bt the way!
Not sure what you mean by v3 but I've had the TDA8950TH for a couple years now.
It has the heatsink already installed and needs only AC to power it up.
I'm running it in BTL mode and it puts out 210 watts rms into 8 ohms. Actually
less (130 w.) at 4 ohms. Stereo it's 105 each channel @ 4 ohms. It's an amazing little amp/smps bt the way!
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