It is all right, this way is much better, you are from Portugal and want a very
powerfull amplifier to produce strong bass for speaker systems.
Understood now, and a hundred percent.
The trouble is that analogic supplies have drops of voltage, 150 watts is the average power i could have and several friends too, using the transformers we found in the market.... some average, something that usually happens, despite the amplifier is able to much more, this depends a stable power supply that will not have voltage drops or losses....with a stable supply, then the chart will be good, but a 500 amplifier, producing full power, will have maybe 1000 watts of power consumption form the supply..so, 500 watts of audio needs 1000 watts from the supply (really 600 watts will need 1000 watts) this is almost twice it's power, so, 500 watts will result in almost (aprox) 1000 watts of consumption, usually is less than that, efficiency is 60 percent.
I have deleted by myself the portuguese text, even having the version together Tinitus perceived as something not very good... write to me asking things and they you gonna have answer in our language.
I am glad you trust on me Tinitus, thank you for that, i wish i could feel exactly the same too, congratulations you are now a moderator.
Subwoofer needs an input filter, a line level electronic crossover, i do not have this for a while....but there's a thread, Dx TriAmp thread, where i am showing how to make it passive,with capacitors and resistances.
regards, (saudações)
Carlos
powerfull amplifier to produce strong bass for speaker systems.
Understood now, and a hundred percent.
The trouble is that analogic supplies have drops of voltage, 150 watts is the average power i could have and several friends too, using the transformers we found in the market.... some average, something that usually happens, despite the amplifier is able to much more, this depends a stable power supply that will not have voltage drops or losses....with a stable supply, then the chart will be good, but a 500 amplifier, producing full power, will have maybe 1000 watts of power consumption form the supply..so, 500 watts of audio needs 1000 watts from the supply (really 600 watts will need 1000 watts) this is almost twice it's power, so, 500 watts will result in almost (aprox) 1000 watts of consumption, usually is less than that, efficiency is 60 percent.
I have deleted by myself the portuguese text, even having the version together Tinitus perceived as something not very good... write to me asking things and they you gonna have answer in our language.
I am glad you trust on me Tinitus, thank you for that, i wish i could feel exactly the same too, congratulations you are now a moderator.
Subwoofer needs an input filter, a line level electronic crossover, i do not have this for a while....but there's a thread, Dx TriAmp thread, where i am showing how to make it passive,with capacitors and resistances.
regards, (saudações)
Carlos
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As I trust you, I wont delete anything
But please write in english from now on, or it will be deleted
But please write in english from now on, or it will be deleted
Yes I'm sorry.
I'll try to write in English
yes. I already have a filter for subwoofer.
I'll try to write in English
yes. I already have a filter for subwoofer.
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Yes Portugal ..
Thank you for your explanations ..🙂
I will start working on the PCB.
Later I tell the result.
regards, 🙂
Nelson Antunes
Thank you for your explanations ..🙂
I will start working on the PCB.
Later I tell the result.
regards, 🙂
Nelson Antunes
Hi people 😉
I new in forum, I speak from Brazil, but I can not speak English, how you perceive (i'am use the translator google)
Do I have two doubt ... The first is: can I change the original DX amplifier (1 pair in the output), adding another pair in the output, and changing the TIP41/42 for 2SC4793 and 2SA1837, symmetric with 55V? watts how he will give me the output to 4 ohms? hope around 250W 🙄
second question .. instead of modifying the original DX .. modify the DHR Turbo, removing some pairs in output, and lowering the voltage .. for example, leave only 3 pairs in output and 55V .. how many watts will it take in 4 ohms ??
I'm sorry for the horrible English
I new in forum, I speak from Brazil, but I can not speak English, how you perceive (i'am use the translator google)
Do I have two doubt ... The first is: can I change the original DX amplifier (1 pair in the output), adding another pair in the output, and changing the TIP41/42 for 2SC4793 and 2SA1837, symmetric with 55V? watts how he will give me the output to 4 ohms? hope around 250W 🙄
second question .. instead of modifying the original DX .. modify the DHR Turbo, removing some pairs in output, and lowering the voltage .. for example, leave only 3 pairs in output and 55V .. how many watts will it take in 4 ohms ??
I'm sorry for the horrible English
The translator did really well. Don't worry about that. I could understand all you wrote.
If we ever have a problem with the translator, we can ask you to clarify what you mean.
+-55Vdc through 2pair output stage into a 4ohm speaker is stressing the transistors a bit, maybe too much. 250W of output from 4off 150W devices is outside what most designers would say is reliable. 3pair will be OK, 4pair better still.
If we ever have a problem with the translator, we can ask you to clarify what you mean.
+-55Vdc through 2pair output stage into a 4ohm speaker is stressing the transistors a bit, maybe too much. 250W of output from 4off 150W devices is outside what most designers would say is reliable. 3pair will be OK, 4pair better still.
There's a Dx Standard, using 50 to 55 volts supplies in the Dx amplifier thread
Was assembled by a North European friend,from Latvia (Letônia)... he made that a couple of years ago,...he is still using...so...modifications are there, schematic are there.
This is the guy, you will see his amplifier, schematic, comments and so on..all in the Dx amplifier thread:
http://www.diyaudio.com/forums/solid-state/96237-destroyer-x-amplifier-dx-amp-my-amplifier.html
regards,
Carlos
Was assembled by a North European friend,from Latvia (Letônia)... he made that a couple of years ago,...he is still using...so...modifications are there, schematic are there.
This is the guy, you will see his amplifier, schematic, comments and so on..all in the Dx amplifier thread:
http://www.diyaudio.com/forums/solid-state/96237-destroyer-x-amplifier-dx-amp-my-amplifier.html
regards,
Carlos
Attachments
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The best solution is to use 1 pair to each 60 watts of power
This depends several things, supply voltage drops, so, the power is never the one specified as it is specified under optimized conditions, not real..... in the real world supply voltage will be reduced as much as the amplifier sucks energy from the supply.
The real thing is average, music is average, even able to produce 600 watts, in the real world, daily use, because of supply, back EMF and other reasons...power will be 200 watts, or even a little bit less.
So, this is the value, this is the power to think about, not the continuous steady tone, sinusoidal, undistorted, maximum, at 4 ohms, unclipped power...so.... to use with music, non distorted music, non square wave tones, not using it as Public Adress, not a professional use, them 3 to 4 pairs is what you really need.
Of course, if your supply is a miraculous one... the one does not loose a single volt at your maximum power(impossible to analogic supplies), if your speaker does not create back EMF forces, if your speaker impedance is flat (impossible!)... then you will need 10 pairs.
So, decisions is up to you, depending your transformer, the way you gonna use your amplifier, the audio source (sampler?, microphone?)..your musical style (noises?, distorted sound?, bass competition?).
Dx amplifier, the standard one, please, go to the Dx amplifier thread, avoid directly mailing.
Each case is a special case, you have brain, so, keept it engaged and think about, having doubts, then call us.
The same text above, same meaning, in portuguese:
"Cada caso é um caso, engrene a cachola, pense e decida, se tiver dúvida nos procure."
regards,
Carlos
This depends several things, supply voltage drops, so, the power is never the one specified as it is specified under optimized conditions, not real..... in the real world supply voltage will be reduced as much as the amplifier sucks energy from the supply.
The real thing is average, music is average, even able to produce 600 watts, in the real world, daily use, because of supply, back EMF and other reasons...power will be 200 watts, or even a little bit less.
So, this is the value, this is the power to think about, not the continuous steady tone, sinusoidal, undistorted, maximum, at 4 ohms, unclipped power...so.... to use with music, non distorted music, non square wave tones, not using it as Public Adress, not a professional use, them 3 to 4 pairs is what you really need.
Of course, if your supply is a miraculous one... the one does not loose a single volt at your maximum power(impossible to analogic supplies), if your speaker does not create back EMF forces, if your speaker impedance is flat (impossible!)... then you will need 10 pairs.
So, decisions is up to you, depending your transformer, the way you gonna use your amplifier, the audio source (sampler?, microphone?)..your musical style (noises?, distorted sound?, bass competition?).
Dx amplifier, the standard one, please, go to the Dx amplifier thread, avoid directly mailing.
Each case is a special case, you have brain, so, keept it engaged and think about, having doubts, then call us.
The same text above, same meaning, in portuguese:
"Cada caso é um caso, engrene a cachola, pense e decida, se tiver dúvida nos procure."
regards,
Carlos
Attachments
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My amplifiers can do 200W into 4r0 from 35+35Vac. The supply rails stand at +-50.5Vdc with amp quiescent current flowing.
If he uses a higher secondary voltage transformer to give ~+-55Vdc then any good amp should deliver at least 250W into 4r0. I agree with your final recommendation 3 or 4pairs for 4ohm use from +-55Vdc.
Personally I would use 3pair for 8ohm use and 4pair for 4ohm use.
DXturbo is playing beautifully from 1 pm to 5 pm with 4 pairs of output driving 4 speakers(at 8 ohms) rated at 300 watts 15 inches diameter and it survive(total is 2 ohms). No blower or fan.
Pictures and video sent to uncle carlos in pm.
The video recorded in nokia celfone so only the instrument and voice is present but the super bass cant be hear. No distortion just clear voice and super bass(for shaking the house)
By the way, the supply voltage is 65 volts DC
Thanks uncle carlos.
Pictures and video sent to uncle carlos in pm.
The video recorded in nokia celfone so only the instrument and voice is present but the super bass cant be hear. No distortion just clear voice and super bass(for shaking the house)
By the way, the supply voltage is 65 volts DC
Thanks uncle carlos.
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More pictures from Masterinvi
enjoy...he had a lot of fun.
Masterinvi video no youtube:
http://www.youtube.com/watch?v=MgGysvG-bj4
regards,
Carlos
enjoy...he had a lot of fun.
Masterinvi video no youtube:
http://www.youtube.com/watch?v=MgGysvG-bj4
regards,
Carlos
Attachments
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Just out of curiosity, the original version of DHR, with 4 pairs in the output, if used in 60V symmetric, in charge of 4 ohms, enough to 500W? course, using forced cooling, it is reliable?
thanks
thanks
according to my test as seen in youtube and ppictures 65volts dc symetric supply with four pairs of output loading 4 speakers 300 watts 15 inches(total 2 ohms) playing for about 5 hrs continously it survive. So dont worry, construct it and set it up correctly, play it and leave it.
My circuit is now in quasi, i love it more, because of extra bass. But i will not show here.
Thanks again to uncle carlos
My circuit is now in quasi, i love it more, because of extra bass. But i will not show here.
Thanks again to uncle carlos
500W into 4r0 requires an output of 63.2Vpk and 15.8Apk.
You cannot get that from a +-60Vdc supply.
i assembled today the dx standard using 20 volts dc rail voltage, i use it to drive my tweeter. Of course my turbo is used for bass( in quasi, 65 volts rail ,3 pairs 2sc5200). A biamp as being called. Assembled in an old sansui case.
Unbeatable sound for me. Nothing i could ask for....
Better to post a pic...
Unbeatable sound for me. Nothing i could ask for....
Better to post a pic...
You see, dear Masterinvi, using 20 volts you could have much better sound adjusting
Bootstrapp resistances and zener resistance...your sound could be much better..even misadjusted to work with 20 volts you felt satisfied.
Really the Dx amplifier sounds very good.... shock proof amplifier, very resistant to errors, mistakes and wrong voltages..very tollerant..works under strange conditions...someone has installed 24 volts battery, he used power resistances to divide voltage to 12 plus 12 and made the amplifier work....almost unbeliavable but he did and sent me a sound sample.
Bootstrapp should be tuned... watch Greg site schematic..change R6 to 1K2... also change R12 to 1K2 and R13 to 1K8
Adjust bias to read 550 milivolts in the output transistors, from base to emitter..install big heatsinks, use minimum of 6800uf each rail and be happy with better sound.
regards,
Carlos
Bootstrapp resistances and zener resistance...your sound could be much better..even misadjusted to work with 20 volts you felt satisfied.
Really the Dx amplifier sounds very good.... shock proof amplifier, very resistant to errors, mistakes and wrong voltages..very tollerant..works under strange conditions...someone has installed 24 volts battery, he used power resistances to divide voltage to 12 plus 12 and made the amplifier work....almost unbeliavable but he did and sent me a sound sample.
Bootstrapp should be tuned... watch Greg site schematic..change R6 to 1K2... also change R12 to 1K2 and R13 to 1K8
Adjust bias to read 550 milivolts in the output transistors, from base to emitter..install big heatsinks, use minimum of 6800uf each rail and be happy with better sound.
regards,
Carlos
i love the dx turbo in handling the bass, really, i love it. THe punch is very clear and tight. But i think dx standard is so precise in sonic than turbo. I dont know, maybe its just my ear because i dont know how to listen. Its not because turbo has much power because of rail voltage, even so, even if you use 50 vdc in dx standard and 50 vdc also in turbo and compare it, you can hear the diffrence. Thats why i decide to choose turbo for my bass and dx standard for my high(tweeter). The result is excellent. Unbeatable for me.
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