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🙂 🙂
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🙂 🙂
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??
I have built half of that but i have lost the document about that, can you help me??
If you have it can you mail me the documents to :
danne_linkinpark@msn.com
I have been looking for this mayby 5 month!!
danne_linkinpark@msn.com
I have been looking for this mayby 5 month!!
OK -I'll try to scan it tonight and upload it somewhere for all interested;
check here for further info
check here for further info
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........😀
it will be there at least 5 days
cheers
ps. if someone need pics of PCBs , just buzz........😀
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
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
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
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
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 🙂 🙂
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 said:
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!
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??
I wounder I somebody here have built this amplifer and haave some pichurse maby??
The Gigant2000 is an entirely different amplifier.
One you forgot is the crescendo ME.
2. is already in sweden.😉
But I have the part to the amplifer and not to the crescendo 2001
Someone that have some phothos of the Crescendo mosfet 250W?
Someone that have some phothos of the Crescendo mosfet 250W?
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