A good way to have results is the way you are doing
go tweaking it till it sounds the way you want.
regards,
Carlos
go tweaking it till it sounds the way you want.
regards,
Carlos
Hi PhongVuTuan!
This is my output stage! I'm using a Symmetrical amp.
If this scheme can make a difference, please tell me that thing.
Tips: using PNG or GIF for better quality and file size. Because I only have aaa.jpeg so using PNG will only have quality but I still use PNG. Capture schematic and save as .PNG at the first time, you will feel the difference
Bye!
This is my output stage! I'm using a Symmetrical amp.
If this scheme can make a difference, please tell me that thing.
Tips: using PNG or GIF for better quality and file size. Because I only have aaa.jpeg so using PNG will only have quality but I still use PNG. Capture schematic and save as .PNG at the first time, you will feel the difference
Bye!
Attachments
After feeling like I was looseing my grip on life and reality in general for about a week, I am happy to announce that I'm back to my manic self.
Feel like doing something solidstate, but am still a bit weary for actualy DOING anything.
Has anyone maybe made a nice eagle PCB for this circuit.
P.S. Destroyer a few pages back you said, you see the movie of your life.... that is one thing we normally (gracefully) don't, there is change, good and bad around every corner, but you have to go around the corner yourself to find it.
Oh, and Graham, what an honour to have you posting here 🙂
Feel like doing something solidstate, but am still a bit weary for actualy DOING anything.
Has anyone maybe made a nice eagle PCB for this circuit.
P.S. Destroyer a few pages back you said, you see the movie of your life.... that is one thing we normally (gracefully) don't, there is change, good and bad around every corner, but you have to go around the corner yourself to find it.
Oh, and Graham, what an honour to have you posting here 🙂
Nordic said:
Everytime i go around a corner i bump into myself.
The lady on Thanh's avatar looks bright.
Vièt Nam is the only nation where a guy can have the same name as a girl, i think.
Hoai/Guy Thanh has a very nice looking girlfriend.
Carlos the Audio Terrorist,
when we see picture of you amplifier in action ?
Hello Nordic...nice dog!.....well Jacco, i am also impressed
with this lady..... i think may be thanh....because we never know if boy or girl only watching their names....lovely lady.
Thanh told me that she is an artist..hummmm...i think he is keeping something hiden from me...hehe
I know a lot of boys in the forum that are not really boys....hehe...the oposite too....just suspections of course...reading the text and perceiving what is natural do females and what is natural for males..
Ahahhaha..sometimes both appear...ahahahahah!
No troubles..i am already married!
Carlos, the terrorist was killed 30 years ago...or more...and i had almost the same face he had....in Miami i had problems in the airport in 1981 because of that...they have confused me with someone...do not know if was that Carlos terrorist or other.
regards folks,
Enjoy the nice forum.... and enjoy the thread...feel alike in your home.
Carlos
with this lady..... i think may be thanh....because we never know if boy or girl only watching their names....lovely lady.
Thanh told me that she is an artist..hummmm...i think he is keeping something hiden from me...hehe
I know a lot of boys in the forum that are not really boys....hehe...the oposite too....just suspections of course...reading the text and perceiving what is natural do females and what is natural for males..
Ahahhaha..sometimes both appear...ahahahahah!
No troubles..i am already married!
Carlos, the terrorist was killed 30 years ago...or more...and i had almost the same face he had....in Miami i had problems in the airport in 1981 because of that...they have confused me with someone...do not know if was that Carlos terrorist or other.
regards folks,
Enjoy the nice forum.... and enjoy the thread...feel alike in your home.
Carlos
just for a week ? you lucky b****** 😀
Good to hear you're okay now 🙂
Yup, tried and tested into dummy-load at 30w rms sine-wave:
Using bc243c/bc244c as drivers, 2sc3855/2sa1491 for op-devices.
Used 3 diodes in series (with .22 uF in parallel) for bias-circuit instead of resistor after frying my first pair of outputs
(maybe because of careless biasing)
brd-file :http://members.chello.nl/k.veenstra9/destroyerx_1.brd
not tested yet, more elegant solution for closing loop of local ps-caps imo:
http://members.chello.nl/k.veenstra9/destroyerx_2.brd
Thanks for the inspiration Carlos 🙂
Best regards,
Klaas
Pertty amplifier this one...remembers me mine one
I hope your unit is working fine.
I could not see the images/linked you informed.
But your picture is fine....you are welcome, related your thanks by the inspiration.
The Dx amplifier, in the level of zero distortion...when absolute any distortion is perceived...best point of operation, is 35 watts...your amplifier is a cousin for sure.... well 75% referenced to the clipping threshold is always a very nice power level....and happens with many amplifiers.
regards,
Carlos
I hope your unit is working fine.
I could not see the images/linked you informed.
But your picture is fine....you are welcome, related your thanks by the inspiration.
The Dx amplifier, in the level of zero distortion...when absolute any distortion is perceived...best point of operation, is 35 watts...your amplifier is a cousin for sure.... well 75% referenced to the clipping threshold is always a very nice power level....and happens with many amplifiers.
regards,
Carlos
Oh....it is my boy....Dx amplifier..i am happy you have tried
When finished, please, tell me how it sounded to you.
What is your voltage...so i will check the series resistor with the diodes to bias.....resistance there may be very small.
Inform, please, your supply voltage...if 30 volts or more.
If i can help you...just tell me.
Nice heat sink into the drivers..better than mine..i am using none.
3 diodes and 100 ohms in series will bias to around 60 miliamps each rail...using 37 plus and 37 minus.
Using 30 volts... 135 ohms will produce almost the same 60 miliamps.
regards,
Carlos
When finished, please, tell me how it sounded to you.
What is your voltage...so i will check the series resistor with the diodes to bias.....resistance there may be very small.
Inform, please, your supply voltage...if 30 volts or more.
If i can help you...just tell me.
Nice heat sink into the drivers..better than mine..i am using none.
3 diodes and 100 ohms in series will bias to around 60 miliamps each rail...using 37 plus and 37 minus.
Using 30 volts... 135 ohms will produce almost the same 60 miliamps.
regards,
Carlos
Attachments
Graag gedaan Nordic 🙂
powersupply-voltage is +/- 35 volts, 300va toroid, 2x47000 uF 😀
quiescent-current ~ 50mA, 100r potmeter measures 25 ohms adjusted.
One channel running, need some parts to complete 2nd channel.
Sounds good, good separation between different instruments.
Claps sound as claps, raindrops sound as raindrops 😎
Best regards,
Klaas
powersupply-voltage is +/- 35 volts, 300va toroid, 2x47000 uF 😀
quiescent-current ~ 50mA, 100r potmeter measures 25 ohms adjusted.
One channel running, need some parts to complete 2nd channel.
Sounds good, good separation between different instruments.
Claps sound as claps, raindrops sound as raindrops 😎
Best regards,
Klaas
Increasing differential transistors gain and the voltage amplifier gain, if needed,
you will have more voltage at the output.
This will result more power as you know...if needed.
47000uF is a very good filtering....have you tried to decrease them, for comparison purposes, for 2200uf, for instance?
I have made this test....if you want to know, ...please..do it by yourself, will be very interesting to know what you have perceived.
I can tell...but i think this is not good...people will have to trust...i think that will be better if people trust in their own perceptions...not trusting in me....trusting in themselves.
If do not want to shock people...go direct to my mail:
nanabrother@yahoo.com
Thank you, as you constructed my baby amplifier.....as you told, sounds nice as i have perceived here too.
In the future, if you like those things, compare it with something known as good...or very good.... result will be interesting to.
No problem if smash it...as it is a very simple amplifier without too much big responsabilities....an old fashioned amplifier that sounds very nice....I am sure it will be a good one inside that competition.
Also...exist a better design made around that topologie in the market... a very good one.
Now a days, a very rare amplifiers...only 7 units sounding around.... you, three friends and 4 units mine.
regards,
Carlos
you will have more voltage at the output.
This will result more power as you know...if needed.
47000uF is a very good filtering....have you tried to decrease them, for comparison purposes, for 2200uf, for instance?
I have made this test....if you want to know, ...please..do it by yourself, will be very interesting to know what you have perceived.
I can tell...but i think this is not good...people will have to trust...i think that will be better if people trust in their own perceptions...not trusting in me....trusting in themselves.
If do not want to shock people...go direct to my mail:
nanabrother@yahoo.com
Thank you, as you constructed my baby amplifier.....as you told, sounds nice as i have perceived here too.
In the future, if you like those things, compare it with something known as good...or very good.... result will be interesting to.
No problem if smash it...as it is a very simple amplifier without too much big responsabilities....an old fashioned amplifier that sounds very nice....I am sure it will be a good one inside that competition.
Also...exist a better design made around that topologie in the market... a very good one.
Now a days, a very rare amplifiers...only 7 units sounding around.... you, three friends and 4 units mine.
regards,
Carlos
My dear old friend Nordic...if you go ahead with this complicated language.
I will have to use Portuguese language, to inform you about something i already send you.
I have sent you a 45 grames diamond....those white ones...and it is hiden inside your home..."no samboque da contra parede do reservado"....
ahahahah!
have you understood?
hehe..."under the cement..between the cement and the bricks, in the front wall related the WC"
ahahahaha!
kidding, of course.
regards,
Carlos
I will have to use Portuguese language, to inform you about something i already send you.
I have sent you a 45 grames diamond....those white ones...and it is hiden inside your home..."no samboque da contra parede do reservado"....
ahahahah!
have you understood?
hehe..."under the cement..between the cement and the bricks, in the front wall related the WC"
ahahahaha!
kidding, of course.
regards,
Carlos
Eagle schematic-files:
http://members.chello.nl/k.veenstra9/destroyerx_1.sch
http://members.chello.nl/k.veenstra9/destroyerx_2.sch
Carlos, will try lower capacitance, something like 2 x 4700 uF
seems to be realistic value, compared to commercial amps of similar wattage.
greetings,
Klaas
http://members.chello.nl/k.veenstra9/destroyerx_1.sch
http://members.chello.nl/k.veenstra9/destroyerx_2.sch
Carlos, will try lower capacitance, something like 2 x 4700 uF
seems to be realistic value, compared to commercial amps of similar wattage.
greetings,
Klaas
I think they use 2200uf to 30 watts undistorted amplifiers.
This is what you have measured first time.
4700uf and 47000uf will be a comparison with a good capacitance with an enormous capacitance.
I mean a bad capacitance, a small capacitance compared with a very big and expensive capacitors.
regards,
Carlos
This is what you have measured first time.
4700uf and 47000uf will be a comparison with a good capacitance with an enormous capacitance.
I mean a bad capacitance, a small capacitance compared with a very big and expensive capacitors.
regards,
Carlos
Hi Thanh in HCM city
It's really nice to see you here. We are in the same country and the same occupation. I'm an IT too. I have a hobby of making amp for fun.
Now you live in Viet nam and in Viet nam I think you can never buy a genuine transistor in HCM city or Hanoi. They are all fake ones with low safe operating area (SOA) and low gain and the bad thing is they are not linear in gain. That is too bad. To make an example if you make a VAS stage with normal darlington design, it will distort like mad and your amp will add a lot of noise to your audio signal. I compared them to ones I have from digikey and found this. 2sa1930 is well reputed for linearity and gain is not OK at all. and 2sc5200 madly distort your amp at as low quiescent current as 50ma. And they will turn your amp into rubbish before you know it. But I can use them to source a light bulb without a problem. (recently I bought a bunch of trans from Digikey: C5200, A1837, bc546, MPSa42/92, 2n5087. And to my surprise they wake up sound quality in my amp)
I found this circuit as a way to go round this problem. The driver trans (TIP41,42) which is fake with poor linearity, I bias them at 70 ma and this will improve. The power transistors (2sc5200-a1943) quiescent current will be at least 100ma. You will have a good heat sink and avoid thermal run away or your amp will blow.
The Emiter resistors in the circuit is used to achieve better linearity.🙂
It's really nice to see you here. We are in the same country and the same occupation. I'm an IT too. I have a hobby of making amp for fun.
Now you live in Viet nam and in Viet nam I think you can never buy a genuine transistor in HCM city or Hanoi. They are all fake ones with low safe operating area (SOA) and low gain and the bad thing is they are not linear in gain. That is too bad. To make an example if you make a VAS stage with normal darlington design, it will distort like mad and your amp will add a lot of noise to your audio signal. I compared them to ones I have from digikey and found this. 2sa1930 is well reputed for linearity and gain is not OK at all. and 2sc5200 madly distort your amp at as low quiescent current as 50ma. And they will turn your amp into rubbish before you know it. But I can use them to source a light bulb without a problem. (recently I bought a bunch of trans from Digikey: C5200, A1837, bc546, MPSa42/92, 2n5087. And to my surprise they wake up sound quality in my amp)
I found this circuit as a way to go round this problem. The driver trans (TIP41,42) which is fake with poor linearity, I bias them at 70 ma and this will improve. The power transistors (2sc5200-a1943) quiescent current will be at least 100ma. You will have a good heat sink and avoid thermal run away or your amp will blow.
The Emiter resistors in the circuit is used to achieve better linearity.🙂
Haha Carlos, I seem to have a natural love for language, and sometimes amaze myself at what I can understand...
But point taken, I wsa just thanking the dutchie for the PCB file.
P.S. I was at school with a bunch of portugese kids.
I read this morning on BBC news it is legal in Brazil for an uncle to marry a niece !!!!!!!!!
But point taken, I wsa just thanking the dutchie for the PCB file.
P.S. I was at school with a bunch of portugese kids.
I read this morning on BBC news it is legal in Brazil for an uncle to marry a niece !!!!!!!!!
Thanks 🙂
Right!
🙂
Do you know ? There are many members who sent email to me. They want to know whether I'm a girl 😀 .
Perhaps it's right! I have just bought a new 2SC5200/2SA1943. Cost is 28.000 VND. How much is cost of 2SC5200/2SA1943 at Digikey ?
Right! So now, I only use diffential VAS instead of darlington VAS. Moreover, gain of darlington VAS is big so I must do compensation but I'm NOT good at designing this. I often have to solve this oscillation problem .I must choose a best choice for me.
Which resistor do you mean ? emitter resistor of C2383 or TIP42 ?
I'm also please to meet a Vietnamese here. There are some Vietnamese members but they rarely disscuss. Do you joint www.diendandientu.com ? A electronic forum of Vietnamese. Why do you think that I'm a IT ? 🙂
I do not know about this law...if allowed, a very rare sittuation i think.
Those laws, are normally made to avoid genetic problem to descendents to that new family arrangement sons.
Also some of those laws have some religious and moral things on it too.
I cannot confirm if this is rigth or not...if this is allowed or not.
I do love languages too...but that one is hard...i cannot understand a single word.
regards,
Carlos
Those laws, are normally made to avoid genetic problem to descendents to that new family arrangement sons.
Also some of those laws have some religious and moral things on it too.
I cannot confirm if this is rigth or not...if this is allowed or not.
I do love languages too...but that one is hard...i cannot understand a single word.
regards,
Carlos
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