Crescendo ampilifier elektor1982 - Page 3

diyman · 18th July 2005, 01:16 AM

This is the circuit of the "baby" mini Crescendo rated around 50W. I have built both and IMHO the higher power power version sounds much better. The mini Crescendo sounds quite warm but mid range is slightly compressed and vocals do not sound very open. Maybe you can muck around with the feedback cap to tweak the sound a bit. Had some oscillation probelms with one channel and the problem sorted out using regular 5 pcs paralleled 1ohm 1W carbon resistors for the output stage instead of a 0.22ohm wirewound. Also used MJE340 and 350 instead of the BF469 and 470. Also sounded better, I think! Once up and running ran more than 10 yrs without any problem.

My 2 cts

danne_linkinpar · 18th July 2005, 08:59 AM

I men this :
"1Kw" Crescendo with 4 x2SJ50 and 4 x2SK135

have you the artical about that?

Zen Mod · 18th July 2005, 10:48 AM

you mean "Gigant" ?
I have xerox of it,but if someone is interested ,I must scan it first

danne_linkinpar · 18th July 2005, 10:54 AM

I ist were intresting, how old are that crecendo mosfet 250w??
I have built half of that but i have lost the document about that, can you help me??

hienrich · 18th July 2005, 11:19 AM

Quote:

you mean "Gigant" ?

if you really mean you have it, I'm also interested

regards,

hienrich

hienrichb@yahoo.com

danne_linkinpar · 18th July 2005, 11:38 AM

If you have it can you mail me the documents to :
danne_linkinpark@msn.com

I have been looking for this mayby 5 month!!

Zen Mod · 18th July 2005, 03:25 PM

OK -I'll try to scan it tonight and upload it somewhere for all interested;

check here for further info

Bensen · 18th July 2005, 03:52 PM

I don't really know if this is the Gigant, but this is a Crescendo with 4 output devices, the original Elektor design uses differnent transistors.

Bensen · 18th July 2005, 03:53 PM

The other side.

Greetz
Ben

Zen Mod · 19th July 2005, 12:50 AM

http://choky.on.neobee.net/downloads/gigant.zip

it will be there at least 5 days
cheers

ps. if someone need pics of PCBs , just buzz........

18th July 2005, 01:16 AM	#21
diyman diyAudio Member Join Date: Nov 2001 Location: Malaysia	Crescendo This is the circuit of the "baby" mini Crescendo rated around 50W. I have built both and IMHO the higher power power version sounds much better. The mini Crescendo sounds quite warm but mid range is slightly compressed and vocals do not sound very open. Maybe you can muck around with the feedback cap to tweak the sound a bit. Had some oscillation probelms with one channel and the problem sorted out using regular 5 pcs paralleled 1ohm 1W carbon resistors for the output stage instead of a 0.22ohm wirewound. Also used MJE340 and 350 instead of the BF469 and 470. Also sounded better, I think! Once up and running ran more than 10 yrs without any problem. My 2 cts

18th July 2005, 10:48 AM	#23
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	you mean "Gigant" ? I have xerox of it,but if someone is interested ,I must scan it first __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

18th July 2005, 03:25 PM	#27
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	OK -I'll try to scan it tonight and upload it somewhere for all interested; check here for further info __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

19th July 2005, 12:50 AM	#30
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	http://choky.on.neobee.net/downloads/gigant.zip it will be there at least 5 days cheers ps. if someone need pics of PCBs , just buzz........ __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

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18th July 2005, 08:59 AM	#22
danne_linkinpar diyAudio Member Join Date: Jul 2005 Location: sda	I men this : "1Kw" Crescendo with 4 x2SJ50 and 4 x2SK135 have you the artical about that?

18th July 2005, 10:54 AM	#24
danne_linkinpar diyAudio Member Join Date: Jul 2005 Location: sda	I ist were intresting, how old are that crecendo mosfet 250w?? I have built half of that but i have lost the document about that, can you help me??

18th July 2005, 11:38 AM	#26
danne_linkinpar diyAudio Member Join Date: Jul 2005 Location: sda	If you have it can you mail me the documents to : danne_linkinpark@msn.com I have been looking for this mayby 5 month!!

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