We have been talking for long time, and i asked him to let me post some schematics.
Those circuits i did not assemble, so, i cannot evaluate, as not hearing i have not this condition.
As Bora is experienced, i suppose he had constructed some prototypes.
Now, presenting Bora to forum friends.
regards,
Carlos
Those circuits i did not assemble, so, i cannot evaluate, as not hearing i have not this condition.
As Bora is experienced, i suppose he had constructed some prototypes.
Now, presenting Bora to forum friends.
regards,
Carlos
Attachments
I made my own choice related his schematics.
One is bridged, very good to use as subwoofer, as can produce a big voltage swing.
I will post in PDF because of quality.
regards,
Carlos
One is bridged, very good to use as subwoofer, as can produce a big voltage swing.
I will post in PDF because of quality.
regards,
Carlos
This other amplifier, the Delta, is a new design
You can see that is dated of September.
regards,
Carlos
You can see that is dated of September.
regards,
Carlos
This third one...the last one for a while, may be interesting to a lot of guys
Because there are many that loves simetrical amplifiers, in special this one that have simetrical input.
Bora will be tracking, to answer the questions that may appear.
regards,
Carlos
Because there are many that loves simetrical amplifiers, in special this one that have simetrical input.
Bora will be tracking, to answer the questions that may appear.
regards,
Carlos
Wonderfull is to receive your visit...good when the first one is someone
That we really apreciate....you Kravitchenko.
This thread started with luck!
regards,
Carlos
That we really apreciate....you Kravitchenko.
This thread started with luck!
regards,
Carlos
The Delta is rather... interesting!!
The catch is the BF469/470 is obsolete now. What would you suggest in replacement ? I've only ever found Japanese devices (notably by Toshiba and Sanyo) as close to these.
The catch is the BF469/470 is obsolete now. What would you suggest in replacement ? I've only ever found Japanese devices (notably by Toshiba and Sanyo) as close to these.
Yes, they are obsolete now a days Jaycee, and will be a little
confused to find a good replacement, because the samples i have in my home, measured 150 of gain, showing me that it is a very low gain unit.... as this small value of gain may had be used to calculate the entire amplifier gain, a good replacement will need reduced gain too....well, Bora may have solution.
Bora place is advanced related New York time line.... around 4 hours i imagine, soon he will be here to suggest some replacement.
The first package of amplifiers Bora sent me, have 25 units....i believe that may have one or two more amplifiers that will interest you.
Amplifiers will be posted in groups of 3 units, a very good idea from Bora, this way, all comments will be around the last post 3 units.... a very few comments and questions will appear related older posted units.
Having curiosity Jaycee, try to visit his home page, where you will have more options.
regards,
Carlos
confused to find a good replacement, because the samples i have in my home, measured 150 of gain, showing me that it is a very low gain unit.... as this small value of gain may had be used to calculate the entire amplifier gain, a good replacement will need reduced gain too....well, Bora may have solution.
Bora place is advanced related New York time line.... around 4 hours i imagine, soon he will be here to suggest some replacement.
The first package of amplifiers Bora sent me, have 25 units....i believe that may have one or two more amplifiers that will interest you.
Amplifiers will be posted in groups of 3 units, a very good idea from Bora, this way, all comments will be around the last post 3 units.... a very few comments and questions will appear related older posted units.
Having curiosity Jaycee, try to visit his home page, where you will have more options.
regards,
Carlos
Hi,
I made his Studio amplifier and Omni protection board, Studio is excellent amplifier, very nice sound and superb stability, it is my first diy amplifier, and I am very pleased, Thanks Bora!!!,
Vinko
I made his Studio amplifier and Omni protection board, Studio is excellent amplifier, very nice sound and superb stability, it is my first diy amplifier, and I am very pleased, Thanks Bora!!!,
Vinko
Omni protects the power transistors in case of overload, the speakers in case of power amp malfunction, protects amplifier in case of short circuit in loudspeaker or speaker cable or too low impedance of connected speakers, and also performs a muting function when the power supply is turned ON or OFF.
Thanks Carlos for your presentation of Bora and his amplifiers! 🙂
I would like to ask Bora what is the purpose of Q3 and Q4 in the Delta design?
Does that connection have a name(after perhaps from some inventor), I have a weak memory I have seen it somewhere.
Cheers Michael
I would like to ask Bora what is the purpose of Q3 and Q4 in the Delta design?
Does that connection have a name(after perhaps from some inventor), I have a weak memory I have seen it somewhere.
Cheers Michael
You welcome Ultima Thule, you are deep in my heart
I cannot wait the day to have another dinner with you, the virtual one we have, in front of the swiming pool.
hehe...was great!...unforgeatable!
Well, Bora may be very happy...when a single forum guy accepted some amplifier, the work done is already paid!
Bora is a little bit busy, as he have two main professions...and some others secondaries responsabilities too.
regards,
Carlos
I cannot wait the day to have another dinner with you, the virtual one we have, in front of the swiming pool.
hehe...was great!...unforgeatable!
Well, Bora may be very happy...when a single forum guy accepted some amplifier, the work done is already paid!
Bora is a little bit busy, as he have two main professions...and some others secondaries responsabilities too.
regards,
Carlos
jaycee said:
Could you explain how it works?
I'm completely puzzled.
Looks like a positive feedback Schmidt trigger to me.
Or maybe I just drunk too little coffee today?
regards
It's a Vbe compensation technique... not sure who the author was originally but it appears in Hawksford's papers.
Hello everybody!
I can't believe there are already 16 posts. I've got very busy day and it was impossible for me to join earlier. First of all I have to thank Carlos for his good will and all efforts. He posses GREAT and, in today's world, pretty rare personality with amazing positive attitude! Hopefully, no one took seriously his grossly exaggerated joke-remarks about me in some previous posts! Carlos... Carlos...
I also have to stress that some of the simulation results (mainly THD) should be taken "with a good pinch of salt" for, practical results were in some cases more than 10 times worst.
ILIMZN - thanks for answering to "Ultima Thule" for me. As I expected, you gave correct answer with maybe little addition that it is actually linearising technique that I have learned from big master Hawksford. I hope, no one think even for a second that it is my invention! It is generally known as "linearised cross-quad". Anyone interested for more details should search for Hawksford's articles on the WEB.
By the way ILIMZN, I am following most of your posts for quite some time, and all I can say is... congratulations!!!... you posses remarkable knowledge as well as fine sense for details and even more for essence of designs. I am glad to say I know you!
Damn... "darkfenriz"! I was hoping that no one would recognize it! Yes, it was started as an audio amp. idea, but ended as High-End Schmidt trigger... of course, high power one.
I can't believe there are already 16 posts. I've got very busy day and it was impossible for me to join earlier. First of all I have to thank Carlos for his good will and all efforts. He posses GREAT and, in today's world, pretty rare personality with amazing positive attitude! Hopefully, no one took seriously his grossly exaggerated joke-remarks about me in some previous posts! Carlos... Carlos...
I also have to stress that some of the simulation results (mainly THD) should be taken "with a good pinch of salt" for, practical results were in some cases more than 10 times worst.
ILIMZN - thanks for answering to "Ultima Thule" for me. As I expected, you gave correct answer with maybe little addition that it is actually linearising technique that I have learned from big master Hawksford. I hope, no one think even for a second that it is my invention! It is generally known as "linearised cross-quad". Anyone interested for more details should search for Hawksford's articles on the WEB.
By the way ILIMZN, I am following most of your posts for quite some time, and all I can say is... congratulations!!!... you posses remarkable knowledge as well as fine sense for details and even more for essence of designs. I am glad to say I know you!
Damn... "darkfenriz"! I was hoping that no one would recognize it! Yes, it was started as an audio amp. idea, but ended as High-End Schmidt trigger... of course, high power one.
i have listened to amplifier called "Sigma" once...i sounded really nice...but i didn't know that the designer is from my country...funny 🙂
Needing to have conversation, i can speak Serbian.
Projacala...you see!...this is amplifier....hehe
The thread main responsable, Baraomega arrived...good to see you Bora.
regards,
Carlos
Projacala...you see!...this is amplifier....hehe
The thread main responsable, Baraomega arrived...good to see you Bora.
regards,
Carlos