Gigant 2000

[Audio Tech]

Hi there,

I would like to know if someone has built this amp with two channels and tested and how it works in bridge?

Regards,

Audio Tech

[MGR]

Do you have a copy of the schematics?

[Audio Tech]

Hi MGR,

Here is a link to schemstics and description. It's in German language and it was taken from Elektor magazine. I hope you will understand the common things.

http://www.corradodriver.de/HTML/Ele...00/Gigant1.htm

Regards,

Audio Tech

[jewilson]

Ah, it to bad I don't read German, it's Greek to me. The amps look very interesting.

[ChocoHolic]

Hi Audio!
I did not build this amp.
But from schematic it looks like a good and simple
straight forward design.
I have some doubts regarding the short circuit protection,
unfortunately I cannot see to where the optocoupler is connected.
If it is only used to turn off the relay, then I would expect a certain
risk of damage.
Even worse if you bridge two chanels and a short circuit between both outputs happen while a large input signal is given....

But except this, I would say it is worth trying.

Good luck
Markus

[Netlist]

I build it a few years ago. It worked from the first time. I never bridged it so I can't comment on that.
It's quite a serious project, I have all the info on paper, unfortunately in Dutch.
The protection circuit is very accurate. Sometimes a bit too willing but this can be adjusted.
It works on output DC protection, overcurrent protection, overvoltage protection, input clipping detection, temperature sensing and inrush current limiting.

/Hugo

[Audio Tech]

Hi ChocoHolic,

All conections for security are conected to security curcuit. This curcuit than acts for protecting the amp by switching relays etc.
I found that page surfing the internet. I thought if someone will ask to take a look on the shematics I'll just link him to that page.

Regards,

Audio Tech

[Audio Tech]

Hi Netlist,

Did you put him in a 19" rack? How did you arrange the cooling?
It will be great if you have some photos of the amp to share.

Audio Tech

Here is my E-mail:audiotech@volja.net

[ChocoHolic]

Hi Audio!
THX for this info.
Netlist states that the protection works very well
and he has build it! So his information might be more
reliable.
My thoughts were the following:
The output stage does not have a dedicated
current limiter. Currents may be limited by emitter
resistors, current amplification of BJTs and rail properties only.
For sound this is typically great, because a additional
current limiter will always influence the signal more
or less. The disadvantage is that without such a current
limiting circuit the possible current are very high.
I typically experienced that the transistors failed before
the relays could turn off....
But I did neither calculate in detail which currents can happen
in this specific gigant 2000, nor checked the SOA of the BJTs.
And there may be there is another current limiting
effect which I do not notice right now.

Cheers
Markus

[Netlist]

Originally posted by Audio Tech
Did you put him in a 19" rack? How did you arrange the cooling?
It will be great if you have some photos of the amp to share.

There is at least one picture on this forum but I can't find it for now.
It's not build into a case.
I'll see what I can find tomorrow or take some other pictures.

/Hugo