Bora is a nice guy from Serbia - Yugoslávia

[engel dela pena]

sir bora,
what about the diode joselito put out to rail in reverse polarity,do you find this a good practice?

 

[alex mm]

..... you have wrong direction on those diodes ,they must be reversed

 

[engel dela pena]

alex,
what does he mean by this?
Dear all,

The amplifier is working good now, clear and very strong. I added 2 more pair of cap at PSU total now is 100,000uf per rail. In addition, I installed 6amps 1000 volts diodes at the output to rails in reverse polarity to avoid loading the amp from speaker

 

[AndrewT]

He means that the diodes do not pass Power Supply rail current directly to Zero Volts.
Reverse polarity requires the diodes to block current flow.

 

[TonyTecson]

alex,
what does he mean by this?
Dear all,

The amplifier is working good now, clear and very strong. I added 2 more pair of cap at PSU total now is 100,000uf per rail. In addition, I installed 6amps 1000 volts diodes at the output to rails in reverse polarity to avoid loading the amp from speaker

Engel,

the diodes are there to protect the collector emitter of the output transistors from back emf of the speakers.....these diodes return the energy back to the psu rails....if those diodes were not there, these back emf have nowhere to go but thru the output trannies....

 

[alex mm]

.......I mean this

 

[Wasim]

what is the address of dr bora's website ? this link is not working Abshost.net

Regards

 

[naf]

:::Borina Amaterska Svastara:::

 

[viktor1986]

Today is the opening of the new forum on boraomega web page.

:::Borina Amaterska Svastara:::

 

[44250]

ome-sigma amplifier

HomeMadeAudioProject: OME SIGMA 2 - YouTube

OME SIGMA (prvi put u ku?i) - YouTube

OME Sigma - HomeMadeAudioProject - YouTube

 

[williamwkk]

FlatBT line preamplifier

anyone can help to submit the cpationed item of schematic, component layout, pcb layout and power supply details for me to build my diy preamplifier. Thanks a lot!

My email address: williamwkk329@gmail.com

 

[anuvisak]

dear williamwkk
flatBT is the intellectual property of Dr.Bora. You have to ask him for it. He will send the details. He is an extremely nice guy and an extremely busy man. So be patient.

Dr.Visakan,K.

Understanding is learning; knowing how to learn is knowledge; Application of knowledge is Intelligence; Making it simple is Brilliance. Dr.Bora makes it simple.

 

[Abdiel]

Since I'm new here, Hi to all.

I have a simple question for Sigma amp, which I'm making. Will it work ok with PSU of +-56V DC? I'll be using Exicons mosfets.
I've gotten the PCB from Dr. Bora in 2013., and just now I've found time to build it.

Are there maybe some new improvements in the current shematic?

Thank you!

Br,
Mladen

 

[Bigun]

Attached,

Carlos

Referring back to post 94 and 95...

This op-amp buffer, I don't understand the schematic, what is the strength of this topology and why these values of resistors in the feedback networks ??

 

[adeel]

reqiired circuit and pcb data

Is that question for me Dadi55?
--------------------------------------
@Wasim
Check your mail for PCB files!

sir
are u send me this amplifier pcb and xircuit data

 

[44250]

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

REST IN PEACE ; Borivoje Jagodić 1955-2016

 

[thimios]

REST IN PEACE ; Borivoje Jagodić 1955-2016

That is bad news

 

[Samuel Jayaraj]

This is terrible news. Exchanged a few emails with him. Incredible guy; simple and humble. Very knowledgeable but ever willing to learn.

RIP Dr. Bora.

 

[Bonsai]

Indeed. RIP Dr. Bora

 

[Trzalica]

Great constructor and amazing person is gone B-(

Boro, Pocivaj u miru!