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Old 11th April 2012, 03:46 PM   #741
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Join Date: Mar 2007
Location: California
Quote:
Originally Posted by Cristi View Post
Cxd400 amplifier module: Connexelectronic
I was interested in the Cxd400 until I saw that the PS rail requirements are extremely tight: +/-62V to +/- 68V! This is 65V +/- 5%, and about the only way to stay within those limits is with an SMPS that has tight regulation around 65V rails. You list the 2000W SMPS with the amp module, but it costs $178.

Any chance that you can offer a 500W SMPS that can be used with ONE of the Cxd400, e.g. in a subwoofer, and is more affordable?

-Charlie
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Old 13th April 2012, 05:43 PM   #742
Cristi is offline Cristi  Europe
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Charlie, to get the stated power, the supply voltage should be within interval. but the module will work with minimum +-56V and max. +-72V. that's because the UVP and OVP threshold is set to aprox that values. this amplifier module can be used with any smps which can provide the required voltage and the power is at least as big as the module power (better, 1.1-1.2 times the amplifier module power).
I don't see the connection between the price of the module and the price of the SMPS2000R. Just because the module cost 1/5 does mean that the smps should cost much less ? one SMPS2000R can supply at least 5 modules in a multi-channel system and yes, we get similar price for the modules as the smps only.
I should remind that this amplifier module offer much more than any competitor product with similar price, and already challenge our production capability, bringing insignificant profit margin. but hey, that's the free market. once the brick is dropped in the water, don't ask why isn't clear anymore...

Off-topic. On another forum i saw someone asking why recently there is a lack of new and interesting products for DIY market, amplifiers, DSP audio circuits and so on. one or the replies was something like that. peoples fighting for cheap bargain pushed the prices below the threshold which any serious company could be interested to invest in creating new and innovative products. If we need cheap, we can do it cheap, but just cheap, that's it. but we still don't want to do it cheap, right ?

Labjr, i reply to all the messages which i get, but recently i do not reply to messages where odd questions or which have the answer in product manuals are asked, longer than one page emails at the end of which one would ask what will be the minimum price and if can get free shipping, or discounts for boards which cost 50 usd all.
I get 60-70, some days over 100 mails except spam, great watches for 9.99, I won a trip to Madagascar, how to claim it, or how to earn 7423 usd per week working at home.... even so, i spend roughly 3-4 sometimes 5 hours replying mails. I spent two days making the layout for CxD300-8R, first day ~3.5 hours, second day ~5 hours, if this comparison mean something.
peoples, please think before sending one, two, three, or one hundred mails or complaining that i do not answer what's the reason.

Noah, the efficiency of the CxD300-8R is over 93% at full power, 77% is an efficiency figure close to well designed class AB amplifiers or class G amplifiers, not even a poor designed class D amplifier, uneless this efficiency figure is given at a very low output power, where the dominant losses are the idle, quiescent losses, which every amplifiers has them.
I try to bring up a broad selection of amplifier modules, both single and dual channel, and the user can decide which one is more suitable based on his needs and the amplifier features. Even the simplest modules still have the basic protections (which many other similar modules do not have, even if some are priced more expensive) such as under-voltage, over-voltage and over-temperature protections.
If someone can consider that these protections are not required, i would ask him how he address an excessive bus pumping issue when the amplifier is supplied from one or two money-well smps which have 1000-2200 uF total capacitance at 63V. and the amplifier another let's say 100-220 uF, altough i saw even less. that mean, at 200W ouptut power, the supply rail will jump up at least 10V when playing normal music and up to 20V when is used for bass only. if the amp is supplied at +-75V and the supply rails will pump 20V each, 5 min. later we will see a new post on forum, asking why the amp smoked out....
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Old 15th April 2012, 03:22 PM   #743
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Location: California
Quote:
Originally Posted by Cristi View Post
Charlie, to get the stated power, the supply voltage should be within interval. but the module will work with minimum +-56V and max. +-72V. that's because the UVP and OVP threshold is set to aprox that values. this amplifier module can be used with any smps which can provide the required voltage and the power is at least as big as the module power (better, 1.1-1.2 times the amplifier module power).
I don't see the connection between the price of the module and the price of the SMPS2000R. Just because the module cost 1/5 does mean that the smps should cost much less ? one SMPS2000R can supply at least 5 modules in a multi-channel system and yes, we get similar price for the modules as the smps only.
Hi Cristi,

Thanks for your thoughts. It's not clear if the voltages that are shown on the product's web page are the ultimate limits (determined by UVP and OVP) or "optimum" voltages. I had assumed the former... I had assumed that only the SMPS200R could be used, and it would be overkill to use that and only one of these amp modules, which is what I want to do. If one of the other SMPS modules can be used, this will be a great mono amp package!

-Charlie
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Old 1st September 2012, 04:27 PM   #744
Cristi is offline Cristi  Europe
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Default 4800W SMPS Available

4800W SMPS available: Connexelectronic
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Old 19th April 2013, 11:31 PM   #745
redjr is offline redjr  United States
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Join Date: May 2011
Location: Danbury, CT
Cristi - Could you provide a color-coded map of the little molex connector cable that comes with this amp module. I'm trying to use it to replace another module (Sure) and I need this info. I can't find any documentation on your website for this module.

Thanks so much,

Rick
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Old 18th February 2014, 08:25 AM   #746
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Join Date: Jul 2005
Location: Auckland, New Zealand
Hi Cristi
I am interested in your TA3020 v3k kit. I have a couple of questions.
1/ Can I bridge this amplifier using wiring technique described in the Tripath application notes? It does not require additional circuitry.
2/
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Old 18th February 2014, 08:29 AM   #747
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Join Date: Jul 2005
Location: Auckland, New Zealand
Whoops

2/ Does this board have Japanese brand electrolytic capacitors supplied?
3/ Does this board use resistors with copper leads? or cheap ones with thin metal leads (and thin sound).

I know your board is very well priced. I am just trying to compare apples with apples.

Thanks
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Old 26th February 2014, 08:34 AM   #748
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Hi, Cristi,

Do you have SMPS based on HiperTFS / HiperPFS / TOPSwitch ICs?
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Old 28th February 2014, 06:19 PM   #749
Cristi is offline Cristi  Europe
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Join Date: Dec 2008
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Jeez.... I thought this thread was ripped off already along with all my useful posts from my seller's section Accidentally I saw it now.

2channel:
1. yes and no. on the TA3020v3k I implemented a low pass filter on the input to prevent nasty things happening when the amp is driven with input signal with high freq. and high amplitude component.
2. yes, brand new and original ones, not like some ebayers sell the amps with fake caps or replaced sleeve. capacitors brand and type depends on the batch.
3. some resistors have copper terminals, most of them are iron/copper/*whatever* alloy. It is more important the material from which the resistive part is made than the terminals. I consider that the difference in sound due to a pure copper terminal resistor to an alloy resistor will be similar as the sound difference due to colour difference of the speaker wire sleeve. I'm sorry, I just don't believe in subjective audiophile stories. I've seen many noisy, poor quality carbon resistors with copper legs which change their value with temperature, and I also saw good quality metal film resistors with iron legs. Add to this that TA3020 amps are still switching amps, class T or D.

LinuksGuru:
I have made a project using HiperLCS and HiperPFS for a customer, that particular project is not for sale on the website. Any particular interest in this family of IC's ? they are the smallest integrated solution but overall cost is higher due to special requirements for the very high freq transformer and efficiency is not that high as similar ones.
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Old 1st March 2014, 02:53 PM   #750
rafjr00 is offline rafjr00  United States
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Location: Pearl River
Cristi,
I was looking at the IRS2092 kit, 500W version. What power supply would you recommend if only using single channel. I am looking for an amp for subwoofer use.
Thanks,
Riki
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