Re: Sorry Todd.
The stupid thing is... I already knew that. Doh! I'll learn.
..Todd
destroyer X said:
The stupid thing is... I already knew that. Doh! I'll learn.
..Todd
One feedback is Dc feedback mainly... detecting waves clipping
other is AC feedback, the one after the electrolitic condenser.
Do you remember Todd.. when clipping DC appear into the output line and goes to drive the second differential transistor... this controls the first stage gain.
One seems to increase and other seems to decrease...ahahahaha!...i hope they do not cancel one each other...
I have not created nor invented this schematic...i have just made small modifications... pure tweaking... something everybody can do if decide to move the s.... you know... s from system...body system on move...mobility.
regards,
Carlos
....................................................................................................
Trust by Dx, the amplifier with dual double feedback having " zippa de do dah" included into the enhancement's enlargement from the unobtainium zispectrum.
ahahahahah!
Carlos
other is AC feedback, the one after the electrolitic condenser.
Do you remember Todd.. when clipping DC appear into the output line and goes to drive the second differential transistor... this controls the first stage gain.
One seems to increase and other seems to decrease...ahahahaha!...i hope they do not cancel one each other...
I have not created nor invented this schematic...i have just made small modifications... pure tweaking... something everybody can do if decide to move the s.... you know... s from system...body system on move...mobility.
regards,
Carlos
....................................................................................................
Trust by Dx, the amplifier with dual double feedback having " zippa de do dah" included into the enhancement's enlargement from the unobtainium zispectrum.
ahahahahah!
Carlos
Re: taj and Alex MM layouts
I think Alex uses Eagle. I just use Microsoft Paint. 😉
..Todd
quoydoy said:
I think Alex uses Eagle. I just use Microsoft Paint. 😉
..Todd
Please dear Alex MM..... produce a black and white layout for us
The one we use to produce boards... black copper lines.... in pdf and respecting the standards related sizing... to allow us to order print into a laser printer and result final product with correct size to hot iron image transference to board.
thanks in advance.
Very nice board AlexMM
regards,
Carlos
The one we use to produce boards... black copper lines.... in pdf and respecting the standards related sizing... to allow us to order print into a laser printer and result final product with correct size to hot iron image transference to board.
thanks in advance.
Very nice board AlexMM
regards,
Carlos
Nice colour to a circuit board
During the seventies Marantz was using this colour into their brand new super modern Fiberglass boards.... into those early days fiberglass boards were modern.
ahahahah!
Carlos
...........................................................
Image came from dear Brian
During the seventies Marantz was using this colour into their brand new super modern Fiberglass boards.... into those early days fiberglass boards were modern.
ahahahah!
Carlos
...........................................................
Image came from dear Brian
An externally hosted image should be here but it was not working when we last tested it.
Dx Corporation crew is constituted by real humans
People here assemble amplifiers but also they have face, family and other hobbies.
This beautifull girl is Udailey daugther...he is moving to Texas and is sending regards to all of you.
Stuart Yanniger also has a very handsome son...very blond and pretty boy.
regards,
Carlos
People here assemble amplifiers but also they have face, family and other hobbies.
This beautifull girl is Udailey daugther...he is moving to Texas and is sending regards to all of you.
Stuart Yanniger also has a very handsome son...very blond and pretty boy.
regards,
Carlos
Attachments
Re: Soon i will take a good look at your work dear Alex
Funny you should mention the TIPs - sure they work on 36V. Even the ungraded 40V ones. But they don't like being overloaded. I had a similar single-ended current feedback amp in a home made boom box years ago (using a 25.2V 2A trafo from Radio Shack). The TIP3055/TIP42 outputs would take 2 ohms, but not a shorted output. I finally wired in some junk mismatched TO-3's and ended all that. The C5200/A1943 are way overkill, but it sure makes it dummy-proof. Back then, high-SOA trannies were out of reach at around $7 each for anything that had a PNP available but there days they are cheap. TIP35/36 would probably be fine on a shorted output though, as would the 140V/10A Fairchild FJA units (at a buck apiece).
destroyer X said:
Funny you should mention the TIPs - sure they work on 36V. Even the ungraded 40V ones. But they don't like being overloaded. I had a similar single-ended current feedback amp in a home made boom box years ago (using a 25.2V 2A trafo from Radio Shack). The TIP3055/TIP42 outputs would take 2 ohms, but not a shorted output. I finally wired in some junk mismatched TO-3's and ended all that. The C5200/A1943 are way overkill, but it sure makes it dummy-proof. Back then, high-SOA trannies were out of reach at around $7 each for anything that had a PNP available but there days they are cheap. TIP35/36 would probably be fine on a shorted output though, as would the 140V/10A Fairchild FJA units (at a buck apiece).
TIP41 and TIP42 are very popular in my country since the seventies
And they still having a good position, beeing used into top performers amplifiers made here...some of them, the old ones, used Marshall Leach schematics.... more modern ones does not use Leach schematics anymore.
They are used mainly as drivers, or pré drivers...and they are used because they cannot operate above a couple of megahertz..this made the unit safe... as cannot oscilate into high very high frequencies... works more stable because of that.
The main problem is to find matched units... Fairchild still provides those folks.
The use of TIP41 and TIP42 is just an example, to show folks how flexible the amplifier can be.... of course will be better to use more modern transistors...in special the ones you can match them.... in the reality every transistor able to face more than 36 volts... the ones can hold 2 amperes from colector to emitter and dissipate more than 40 watts will fit into the output position.... some overkill can be used too.... up to you my dear.
You may use the ones you like.
regards,
Carlos
And they still having a good position, beeing used into top performers amplifiers made here...some of them, the old ones, used Marshall Leach schematics.... more modern ones does not use Leach schematics anymore.
They are used mainly as drivers, or pré drivers...and they are used because they cannot operate above a couple of megahertz..this made the unit safe... as cannot oscilate into high very high frequencies... works more stable because of that.
The main problem is to find matched units... Fairchild still provides those folks.
The use of TIP41 and TIP42 is just an example, to show folks how flexible the amplifier can be.... of course will be better to use more modern transistors...in special the ones you can match them.... in the reality every transistor able to face more than 36 volts... the ones can hold 2 amperes from colector to emitter and dissipate more than 40 watts will fit into the output position.... some overkill can be used too.... up to you my dear.
You may use the ones you like.
regards,
Carlos
This amplifier can operate with higher voltages too
schematic was simulated for high power version..... have only to increase capacitor voltages and change some transistors to face 150 watts dissipation into 4 ohms and re-adjust the output voltage and stand by current.
Flexible amplifier this one.
And sounds delicious...this is different from perfect or very good...it is more than that to our ears and worse than that to purists.... it is wonderfull to simulators and measurements too.
Some folks when watch capacitor coupling into the output already think the amplifier is not good... this is not real... a pitty that those folks do not even assemble things to listen...they will change their minds the first time they couple using capacitors.
John Lindsey Hood did that... many nice brands still use them too.
regards,
Carlos
schematic was simulated for high power version..... have only to increase capacitor voltages and change some transistors to face 150 watts dissipation into 4 ohms and re-adjust the output voltage and stand by current.
Flexible amplifier this one.
And sounds delicious...this is different from perfect or very good...it is more than that to our ears and worse than that to purists.... it is wonderfull to simulators and measurements too.
Some folks when watch capacitor coupling into the output already think the amplifier is not good... this is not real... a pitty that those folks do not even assemble things to listen...they will change their minds the first time they couple using capacitors.
John Lindsey Hood did that... many nice brands still use them too.
regards,
Carlos
Watch Duel movie made in 1970 and directed by Steven Spielberg
And listen to the sound.... recorded with analogic equipment..observe the quality and dinamics...this sound came from analogic master!
This will be good to more young folks to perceive that old things can be good and sometimes able to beat more modern stuff.
regards,
Carlos
...........................................
Also build the delicious Trust amplifier... satisfaction guaranteed!... but must accept it is a low power amplifier..not made for powerholics.
And listen to the sound.... recorded with analogic equipment..observe the quality and dinamics...this sound came from analogic master!
This will be good to more young folks to perceive that old things can be good and sometimes able to beat more modern stuff.
regards,
Carlos
...........................................
Also build the delicious Trust amplifier... satisfaction guaranteed!... but must accept it is a low power amplifier..not made for powerholics.
Attachments
Carlos
have look at
http://www.geocities.com/quhno/black-devil/index.html
maybe google can translate it for you.
This little amplifier was very controversal twenty years ago, because the author/publishing magazine advertised it as 'high end'.
regards
have look at
http://www.geocities.com/quhno/black-devil/index.html
maybe google can translate it for you.
This little amplifier was very controversal twenty years ago, because the author/publishing magazine advertised it as 'high end'.
regards
Re: This amplifier can operate with higher voltages too
If you are willing to accept a lower input impedance, you can increase R4 (DC feedback). This will allow the AC feedback to shift the pole caused by the output cap even further out closed loop. R2 gets lowered when you adjust the output to 1/2 Vcc (which lowers Zin) but that's a small price to pay for extending out the bass response.
The output cap on this might also be a good place to use a 25V soup-can computer grade that's too low a voltage to be used in an amp power supply. It only needs to be a bit over 1/2 Vcc.
destroyer X said:
If you are willing to accept a lower input impedance, you can increase R4 (DC feedback). This will allow the AC feedback to shift the pole caused by the output cap even further out closed loop. R2 gets lowered when you adjust the output to 1/2 Vcc (which lowers Zin) but that's a small price to pay for extending out the bass response.
The output cap on this might also be a good place to use a 25V soup-can computer grade that's too low a voltage to be used in an amp power supply. It only needs to be a bit over 1/2 Vcc.
Thank you Juergen and wg-ski... the amplifier is ready
will not be tweaked... the moment to take decisions about what to do and how to do have already passed...circuit selection too..also subcircuit selection was finished...all copies and inspired models already studied..... everything ready to go..also was tested..and evaluated by my friends...we have nice schematic and we already have board layout.... so...all we need is people to assemble and to evaluate listening (not theories, new schematics, opinions, suggestions, THD discussions, subcircuits introductions or something alike that)
Suggestions about circuits, or modifications, or upgrades, are not needed or even welcome...i would like people to assemble and evaluate the unit operating.... with people listening the amplifier playing..this interest to us.... we will not inspect the amplifier theory or will recalculate or redesign..it is offered to forum folks to assemble.
Please, do not even try to discuss theories not to atract boring theorists to come here.... i am glad you have not tried to do that... you can see what happened with the Krill thread... i will not enter the same game dear Steve have entered... not a fun to me.
Usually theory addicted folks do not assemble nothing..they like only to talk and to discuss theories...not our interest to have those folks down here.... this place is for builders... the real DIY folks.
of course fellows, you can assemble it the way you want..with the modifications you want...but will not be the Trust... the guaranteed amplifier from Dx Corporation...will be something inspired into Trust or another amplifier...another thing.
Only missed things are beeing included by Doctor Todd Johnson... some by pass capacitors missed and some informations to be printed into the board.
Thank you folks.
Will read Juergen
regards,
Carlos
will not be tweaked... the moment to take decisions about what to do and how to do have already passed...circuit selection too..also subcircuit selection was finished...all copies and inspired models already studied..... everything ready to go..also was tested..and evaluated by my friends...we have nice schematic and we already have board layout.... so...all we need is people to assemble and to evaluate listening (not theories, new schematics, opinions, suggestions, THD discussions, subcircuits introductions or something alike that)
Suggestions about circuits, or modifications, or upgrades, are not needed or even welcome...i would like people to assemble and evaluate the unit operating.... with people listening the amplifier playing..this interest to us.... we will not inspect the amplifier theory or will recalculate or redesign..it is offered to forum folks to assemble.
Please, do not even try to discuss theories not to atract boring theorists to come here.... i am glad you have not tried to do that... you can see what happened with the Krill thread... i will not enter the same game dear Steve have entered... not a fun to me.
Usually theory addicted folks do not assemble nothing..they like only to talk and to discuss theories...not our interest to have those folks down here.... this place is for builders... the real DIY folks.
of course fellows, you can assemble it the way you want..with the modifications you want...but will not be the Trust... the guaranteed amplifier from Dx Corporation...will be something inspired into Trust or another amplifier...another thing.
Only missed things are beeing included by Doctor Todd Johnson... some by pass capacitors missed and some informations to be printed into the board.
Thank you folks.
Will read Juergen
regards,
Carlos
This one is another one i like Juergen
Was made by brazilian Philips during the seventies..and sold as a Kit.... more modern, uses differential amplifier into the input... and i know this one sounds good too..but do not measure so good as the Trust. (0.007% THD)
The Trust is even more simple.... alike the one you shown into your link.
Thank you Juergen
regards,
Carlos
Was made by brazilian Philips during the seventies..and sold as a Kit.... more modern, uses differential amplifier into the input... and i know this one sounds good too..but do not measure so good as the Trust. (0.007% THD)
The Trust is even more simple.... alike the one you shown into your link.
Thank you Juergen
regards,
Carlos
Attachments
Wife and daugther are sending you regards.
To all Dx Corporation crew members... the ones have built..the ones wants to build and the ones are buiding.
Be happy folks... listen Dx Amplifiers...made and tune to sound fine.
regards,
Carlos
....................................................................................................
Listen the Trust amplifier here:
Remember that digital cameras are not so good to audio recording, in special into high frequencies of audio..... the real thing is much better... listen using good speaker and amplifier...do not use those tiny computer speakers please.
http://www.youtube.com/watch?v=w3QphsVZm0Q
To all Dx Corporation crew members... the ones have built..the ones wants to build and the ones are buiding.
Be happy folks... listen Dx Amplifiers...made and tune to sound fine.
regards,
Carlos
....................................................................................................
Listen the Trust amplifier here:
Remember that digital cameras are not so good to audio recording, in special into high frequencies of audio..... the real thing is much better... listen using good speaker and amplifier...do not use those tiny computer speakers please.
http://www.youtube.com/watch?v=w3QphsVZm0Q
Attachments
- Status
- Not open for further replies.