Standards
My piont ?
I can take the enclosure part as I have done some research and maybe I can make some enclosure standards as I have a design education facilities nearby.
De facto, if you use some chemicals to make up your aluminium sheets be careful as the chemicals may harm your health seriously.
😉
My piont ?
I can take the enclosure part as I have done some research and maybe I can make some enclosure standards as I have a design education facilities nearby.
De facto, if you use some chemicals to make up your aluminium sheets be careful as the chemicals may harm your health seriously.
😉
Sound very discordant.
Many use chemicals to make up their PCB sheets in another thread. Visit there for your lecture about chemistry.
Or, teach the people under your flag as they need it.
😉
Many use chemicals to make up their PCB sheets in another thread. Visit there for your lecture about chemistry.
Or, teach the people under your flag as they need it.
😉
Standards
I mean that if we will make anything good we have to think at least twice, the products we use should be used and handled by great care to protect your health and the environment.
I think that a preamp for example would be much more worth for yourself if you know that you have used material that not pollute our environment and so on.
I saw an ad on the web pcb for peanuts in Bulgaria, do they use a safe manufacturing line, hardly.
One thing with my acto is to trying to find retailers that sells good esoteric high end parts, I have a letter in this forum where I nag about parts one guy mentioned a German machine workshop where they offered frontplates I checked this firm out and find a great product, I will use them for parts to my enclosures but maybe not the faceplates as they only can mill 4mm I will use 10mm.
My needs now is a small 5 mm reed switch goldplated I have a sample it is just wonderful I will use it as input switch together with a small magnet making up some construction so it looks and works like a rotary switch.
But unfortunately they only sell 2000 pcs as min, OK there is many retailers that sell DIY parts but it is too expensive I found a japanese high end switch last week it looked a bit cheap so I mailed the company and get the prices and found that they where even more expensive then the ELMA.
So I will try to find some way to make almost any mechanical part that I use in my encolsures with care and reflection.
One thing I will warn everybody that use Alodine DONT MIX IT AT HOME DO NOT USE THE POWDER VERY HARMFUL YOU MAY GET CANCER use the ready mixed product.
😎
I mean that if we will make anything good we have to think at least twice, the products we use should be used and handled by great care to protect your health and the environment.
I think that a preamp for example would be much more worth for yourself if you know that you have used material that not pollute our environment and so on.
I saw an ad on the web pcb for peanuts in Bulgaria, do they use a safe manufacturing line, hardly.
One thing with my acto is to trying to find retailers that sells good esoteric high end parts, I have a letter in this forum where I nag about parts one guy mentioned a German machine workshop where they offered frontplates I checked this firm out and find a great product, I will use them for parts to my enclosures but maybe not the faceplates as they only can mill 4mm I will use 10mm.
My needs now is a small 5 mm reed switch goldplated I have a sample it is just wonderful I will use it as input switch together with a small magnet making up some construction so it looks and works like a rotary switch.
But unfortunately they only sell 2000 pcs as min, OK there is many retailers that sell DIY parts but it is too expensive I found a japanese high end switch last week it looked a bit cheap so I mailed the company and get the prices and found that they where even more expensive then the ELMA.
So I will try to find some way to make almost any mechanical part that I use in my encolsures with care and reflection.
One thing I will warn everybody that use Alodine DONT MIX IT AT HOME DO NOT USE THE POWDER VERY HARMFUL YOU MAY GET CANCER use the ready mixed product.
😎
Back to business
Now I am back to the single end part of this thread I was asking about the Blowtorch and what kind of circuit design they use.
I will try a new concept making a preamp with very few parts in the active part and use a very good output transformer of cource this will be single ended any that can advice me, I need a good circuit before this transformer it may be a class a high current device.
I will use a singel positive power supply I wonder why we use positive supply's, I think that the NAGRA use minus as supply can this has something to do with an old standard or...
🙂
Now I am back to the single end part of this thread I was asking about the Blowtorch and what kind of circuit design they use.
I will try a new concept making a preamp with very few parts in the active part and use a very good output transformer of cource this will be single ended any that can advice me, I need a good circuit before this transformer it may be a class a high current device.
I will use a singel positive power supply I wonder why we use positive supply's, I think that the NAGRA use minus as supply can this has something to do with an old standard or...
🙂
Re: Henrick ; driving X ZLS unbal to get X bal out?
Anael
Thanks for the compliment.
About my XBOSOZ (X ZBLS) and XSOZ http://www.diyaudio.com/forums/showthread.php?s=&threadid=3949&perpage=15&pagenumber=17 "henrik x-bsoz and x-soz.zip"
XBOSOZ as unbal to balanced converter?
The output at the undriven side is about 90% of the output of the driven. This lack of output maching is from my point of view not important at all if the poweramp shows a reasonable diffrential behaviour (as converter) it self, as for example the SOZ, Henrik-XSOZ or Aleph-X. In my combination of the XBOSOZ and XSOZ I see less than 0.3% mismatch at the speaker.
You looses 10% of the X-match and CMRR in the XBOSOZ, but at the speaker I guess You will have almost max. CMRR, because of the <0.3% mismatch at the speaker.
But when you runs the Henrik-XBOSOZ unbalanced, You don´t short the gate of Q102 to ground, You will short the node R121/P102 to ground, otherwise You no X.
If You ad a CCS as the tail You will get a perfect match, but the sound will degrade a little, at least that is my expierience, se my thread "Some tests on CCS´s" on http://www.diyaudio.com/forums/showthread.php?s=&threadid=3949&perpage=15&pagenumber=28.
R115?
Right, this one is now a pice of wire, and that is to get maximum X-feedback.
Right, Q101 and Q102 shoud be a matched pair.
It is very easy to convert/test the BZLS (BOSOZ) to/as a XBZLS (XBOSOZ), and if your poweramp is Aleph, Aleph-X or so, You can keep C101/102 at the original value of 10uF because of the higher inputimpedance.
Hope this will do.
Regards
nar said:
Anael
Thanks for the compliment.
About my XBOSOZ (X ZBLS) and XSOZ http://www.diyaudio.com/forums/showthread.php?s=&threadid=3949&perpage=15&pagenumber=17 "henrik x-bsoz and x-soz.zip"
XBOSOZ as unbal to balanced converter?
The output at the undriven side is about 90% of the output of the driven. This lack of output maching is from my point of view not important at all if the poweramp shows a reasonable diffrential behaviour (as converter) it self, as for example the SOZ, Henrik-XSOZ or Aleph-X. In my combination of the XBOSOZ and XSOZ I see less than 0.3% mismatch at the speaker.
You looses 10% of the X-match and CMRR in the XBOSOZ, but at the speaker I guess You will have almost max. CMRR, because of the <0.3% mismatch at the speaker.
But when you runs the Henrik-XBOSOZ unbalanced, You don´t short the gate of Q102 to ground, You will short the node R121/P102 to ground, otherwise You no X.
If You ad a CCS as the tail You will get a perfect match, but the sound will degrade a little, at least that is my expierience, se my thread "Some tests on CCS´s" on http://www.diyaudio.com/forums/showthread.php?s=&threadid=3949&perpage=15&pagenumber=28.
R115?
Right, this one is now a pice of wire, and that is to get maximum X-feedback.
Right, Q101 and Q102 shoud be a matched pair.
Tecnically Yes, but in my believes I don´t think the sound will benefit from this. May bee two in parallel wil do a better job, I don´t know. This was suggested by jh6You.
It is very easy to convert/test the BZLS (BOSOZ) to/as a XBZLS (XBOSOZ), and if your poweramp is Aleph, Aleph-X or so, You can keep C101/102 at the original value of 10uF because of the higher inputimpedance.
Hope this will do.
Regards
Enclosure
Graphite laminate enclosure may be worth a try, pro; non metal
behavior and good sheilding properties if we combine graphite laminate and thin copper foil, cons; hard to assemble, if we will need coolers use copper, I think we can achieve a very good enclosure for at least a preamp.😎
Graphite laminate enclosure may be worth a try, pro; non metal
behavior and good sheilding properties if we combine graphite laminate and thin copper foil, cons; hard to assemble, if we will need coolers use copper, I think we can achieve a very good enclosure for at least a preamp.😎
Pusan
Come down Mr Pusan I don't mean to bitch I just want a more truculent debate in search of the lost good cheap parts I'm also a nice if not a servile guy but nevertheless a agreeable Northlandic hubby.😉
Come down Mr Pusan I don't mean to bitch I just want a more truculent debate in search of the lost good cheap parts I'm also a nice if not a servile guy but nevertheless a agreeable Northlandic hubby.😉
leiade
I am just back from my two day weekend mountain hiking.
My profession is closely related to safeguard of life, property and environment.
Surely, the environment is my first concern. In this thread, however, I like to talk
about Pass X-fied or similar circuits. Sorry but no others.
By the way, you have changed your original location. Any special reason...?
JH
I am just back from my two day weekend mountain hiking.
My profession is closely related to safeguard of life, property and environment.
Surely, the environment is my first concern. In this thread, however, I like to talk
about Pass X-fied or similar circuits. Sorry but no others.
By the way, you have changed your original location. Any special reason...?
JH
Thanks a lot henrik I think that will do.I will try the mods as soon
as I can.
Maybe sound with CCS you tested is not good because the CCS are not simple enough...I think about all Alephs with their differential current source.One mosfet,2 resistors and a zener.
Otherwise why Nelson wouldn't have done it with resistors? 😉
Best regards
Anael
as I can.
Maybe sound with CCS you tested is not good because the CCS are not simple enough...I think about all Alephs with their differential current source.One mosfet,2 resistors and a zener.
Otherwise why Nelson wouldn't have done it with resistors? 😉
Best regards
Anael
Location and Nature
Hi,
Yes we should take the debate back to origin, BTW do you have any sugestion for my new experiments a single ended drive circuit for a line output transformer from Lundahl it should be very few parts almost like a pass clone I expect about 15 - 20 V as maximum output level the Lundahl xformer is a new type with high output and low distorsion frequency response 10 -100000Hz.
My location is more exact then before I live in a poor province up north in Sweden called Northland if you translate it to english, we have full winter now with lots of snow and very cold down to -15C.🙂
Hi,
Yes we should take the debate back to origin, BTW do you have any sugestion for my new experiments a single ended drive circuit for a line output transformer from Lundahl it should be very few parts almost like a pass clone I expect about 15 - 20 V as maximum output level the Lundahl xformer is a new type with high output and low distorsion frequency response 10 -100000Hz.
My location is more exact then before I live in a poor province up north in Sweden called Northland if you translate it to english, we have full winter now with lots of snow and very cold down to -15C.🙂
Hi leiade
I was skiing in Trysil two years ago –18C. It was too cold to feel my nose and ears.
BTW, I like to see your single ended line stage circuit. Would you post the circuit?
JH
I was skiing in Trysil two years ago –18C. It was too cold to feel my nose and ears.
BTW, I like to see your single ended line stage circuit. Would you post the circuit?
JH
This comment is the background of my CCS tails for the SOBOZ as an unbalance-balance converter. I can not prove this mathematically. For me, the CCS tails help for the clean sound (low distortion). The clean sound defines transparency, details in mid and upper frequencies, clean harmonic textures and accordingly clean feeling of wider and deeper soundstage. I think I got this.
Someone could claim, “Too clean water kills fish.”
JH
jh6you
As I remeber, You tried to modify the BOSOZ to be a better converter by reducing the value of R15 to get better diff. behaveiour. By dooing this You got too much gain, wich You reduced with some splitting resistios at the input (waist of gain).
The cost of this modification were much higer distorton and noice figures, even when the differential cancellation was improoved.
Then Nelson suggested it would be better to make some CCS, and that I beleve.
Bu the Question is still, do You need this perfect match?
If Your "amplifier has an ordinary balanced input" then You dont need the perfect match, because the last diffrential amp does also convert, so in the end You will have a perfect match.
This is what I got from this discussion.
🙂
In my oppininon this answer from Nelson deals with the fact, that if You in the end (at the speakers) can obtain equal amplitudes, then you will get the diffrential cancellation of the noise and distortion that appears in commonmode.
As I remeber, You tried to modify the BOSOZ to be a better converter by reducing the value of R15 to get better diff. behaveiour. By dooing this You got too much gain, wich You reduced with some splitting resistios at the input (waist of gain).
The cost of this modification were much higer distorton and noice figures, even when the differential cancellation was improoved.
Then Nelson suggested it would be better to make some CCS, and that I beleve.
Bu the Question is still, do You need this perfect match?
If Your "amplifier has an ordinary balanced input" then You dont need the perfect match, because the last diffrential amp does also convert, so in the end You will have a perfect match.
This is what I got from this discussion.
🙂
Henrik
Tonight, I would like to talk about two things only.
JH
Reference:
Horowitz & Hill, The Art of Electronics, second edition, Cambridge, PP100-101
Tonight, I would like to talk about two things only.
- The common mode gain of the diff amp can be reduced enormously by using the CCS. The CCS is a large equivalent resistor, and so the common mode gain could be nearly zero.
- If the symmetrical diff amp (BOSOZ) generates equal signal swings at its output and drives an additional diff amp stage (XSOZV2), the overall common mode rejection is greatly improved.
JH
Reference:
Horowitz & Hill, The Art of Electronics, second edition, Cambridge, PP100-101
Anael
I just saw Your post now.
The difference in sonical quality I encountered between resistors and CCS´s was not at all enormous, it took som rearley carefull listenig to hear this subtle difference, but it were there. But as I said in my post on the CCS tests, this is related to my setup, it does not have to be in generel.
I think this issue is more about listening more than measureing results.
Try out some listening test with resistors versus CCS´s, then You know, otherwise You have to beleive.
Even when You are certain, it is still not objektive.
I am eager to hear You tell about Your expieriences with this X-modification.
jh6you
1. Since the mismatch in outputamplitude is only 10%, the benefit from the CCS can´t be enormous, since you gets 90% of the CMRR with resistors, thus the CCS can only do the job a little better. Depends on the point of view.
2. Yes.
If You did some listening A/B tests we would have somethig to talkabout, since the final judgement on this issue must be based on what we actually can hear. Then we could discuss what defines good sound, and see if there is some common ground to share or not.
I just saw Your post now.
Actually hi did, the BOSOZ is sourced with resistors.
I tried exactly that one too, and it came out as the best CCS.
The difference in sonical quality I encountered between resistors and CCS´s was not at all enormous, it took som rearley carefull listenig to hear this subtle difference, but it were there. But as I said in my post on the CCS tests, this is related to my setup, it does not have to be in generel.
I think this issue is more about listening more than measureing results.
Try out some listening test with resistors versus CCS´s, then You know, otherwise You have to beleive.
Even when You are certain, it is still not objektive.
I am eager to hear You tell about Your expieriences with this X-modification.
jh6you
1. Since the mismatch in outputamplitude is only 10%, the benefit from the CCS can´t be enormous, since you gets 90% of the CMRR with resistors, thus the CCS can only do the job a little better. Depends on the point of view.
2. Yes.
The price to pay for this trade could still be a slightly degraded sound, payed when You use a active component instead of a passive in this specific place.
If You did some listening A/B tests we would have somethig to talkabout, since the final judgement on this issue must be based on what we actually can hear. Then we could discuss what defines good sound, and see if there is some common ground to share or not.
jh6you
Could You tell me a little about the book "The Art of Electronics" You referred to, I need a good book, this one could be the one.
regards
Could You tell me a little about the book "The Art of Electronics" You referred to, I need a good book, this one could be the one.
regards
The Art of Electronics
Yes, this book is "the one". Just get the book. You will not be dissappointed. Trust us 😀
mlloyd1
Yes, this book is "the one". Just get the book. You will not be dissappointed. Trust us 😀
mlloyd1
Henrik said:
The art of electronics
As I know, in this large book, there are a lot of circuits but little maths.
As I know, in this large book, there are a lot of circuits but little maths.