Crescendo ampilifier elektor1982 - Page 4

amplifierguru · 19th July 2005, 01:27 AM

Hi Benson,

Referring to your posted schema. It's such a pity that it's sooo
wasteful of supply. That's the price you pay for running MOSFETs as source followers. The gigant has conceded and run higher drive supplies to reclaim some of the output losses.

Now if only they were to operate them as CE then they could go R2R. And guess what - the slew rate would go up..up !

Why? Anyone?

Cheers,
Greg

hienrich · 19th July 2005, 10:31 AM

hi,

I just want to make this clear ...

are the rails + - 81 ?

and seems also close to the 300watt hitachi mosfet amp or this would

be this, which was also posted sometime back...

Guru: is there something you can do improve this

rgrds,

hienrich

diyman · 19th July 2005, 03:00 PM

I built this as well! Mediocre sound but reaaaly good driving power. Never heard my my pair of Kef 105s sing so effortlessly. Fairly stable and ran for years without any problem but just like the other Crescendo members, midrange is slightly dark. Some female singers can sound as if they have a slight cold!! Playing around with the feedback capacitors can change the sound. Perhaps you can try different values or bypassing it with some PP caps. If you're looking for sound reinforcement, go for it!! Mine was built with all the recommended solid state devices without any bridging.

ckt

danne_linkinpar · 21st July 2005, 07:38 PM

choky that was not that a mean!!

Zen Mod · 22nd July 2005, 12:20 AM

Quote:

Originally posted by danne_linkinpar
choky that was not that a mean!!

for my knowledge-there are just 3 "Crescendos" :
1. mini Crescendo (just one pair of output fets)
2.Crescendo - two pair of outputs , and
3 . Gigant

you must wait 'till tommorow for scan of 2.

cheers!

danne_linkinpar · 22nd July 2005, 05:50 PM

Next week I gone to start built my Crecsendo Mosfet 250W from news paper "Elektor".
I wounder I somebody here have built this amplifer and haave some pichurse maby??

joensd · 22nd July 2005, 06:49 PM

Quote:

3 . Gigant

The Gigant2000 is an entirely different amplifier.
One you forgot is the crescendo ME.

2. is already in sweden.

joensd · 22nd July 2005, 06:52 PM

Quote:

haave some pichurse maby??

I want to see your amps!
posts 35-38 and 42.

danne_linkinpar · 22nd July 2005, 08:37 PM

But I have the part to the amplifer and not to the crescendo 2001
Someone that have some phothos of the Crescendo mosfet 250W?

danielrs · 24th July 2005, 04:49 AM

Here are Millenium Crescendo schematic for your reference. Same concept with previous Crescendo but it uses new Toshiba 2SK1530 / 2SJ201. I have a comnplete size is big, 2.9MB.

19th July 2005, 03:00 PM	#33
diyman diyAudio Member Join Date: Nov 2001 Location: Malaysia	250W Crescendo I built this as well! Mediocre sound but reaaaly good driving power. Never heard my my pair of Kef 105s sing so effortlessly. Fairly stable and ran for years without any problem but just like the other Crescendo members, midrange is slightly dark. Some female singers can sound as if they have a slight cold!! Playing around with the feedback capacitors can change the sound. Perhaps you can try different values or bypassing it with some PP caps. If you're looking for sound reinforcement, go for it!! Mine was built with all the recommended solid state devices without any bridging. ckt

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
crescendo amp	neeraj	Solid State	10	22nd April 2012 11:13 AM
A nice and helpful web for ampilifier.	7788q	Class D	1	7th August 2009 03:25 PM
problems with mofset car ampilifier	hicksy_5	Solid State	4	13th January 2006 02:52 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

19th July 2005, 01:27 AM	#31
amplifierguru Account Disabled Join Date: Aug 2004 Location: Earth	Hi Benson, Referring to your posted schema. It's such a pity that it's sooo wasteful of supply. That's the price you pay for running MOSFETs as source followers. The gigant has conceded and run higher drive supplies to reclaim some of the output losses. Now if only they were to operate them as CE then they could go R2R. And guess what - the slew rate would go up..up ! Why? Anyone? Cheers, Greg

19th July 2005, 10:31 AM	#32
hienrich diyAudio Member Join Date: Dec 2004 Location: City of Gentle People	hi, I just want to make this clear ... are the rails + - 81 ? and seems also close to the 300watt hitachi mosfet amp or this would be this, which was also posted sometime back... Guru: is there something you can do improve this rgrds, hienrich

21st July 2005, 07:38 PM	#34
danne_linkinpar diyAudio Member Join Date: Jul 2005 Location: sda	choky that was not that a mean!!

22nd July 2005, 05:50 PM	#36
danne_linkinpar diyAudio Member Join Date: Jul 2005 Location: sda	Next week I gone to start built my Crecsendo Mosfet 250W from news paper "Elektor". I wounder I somebody here have built this amplifer and haave some pichurse maby??

22nd July 2005, 08:37 PM	#39
danne_linkinpar diyAudio Member Join Date: Jul 2005 Location: sda	But I have the part to the amplifer and not to the crescendo 2001 Someone that have some phothos of the Crescendo mosfet 250W?