UGS Power : it's U.P.

[flg]

I guess I could have added that; MOSFETs' being a voltage driven device and Bipolar being a current driven device, your not going to make a MOSFET current mirror. An opposing pair of current sources maybe but a current mirror like the traditional BJT type does not achieve the same current balancing performance.

 

[Algar_emi]

See my own UP amp progress at: http://www.diyaudio.com/forums/pass-labs/272891-my-ugs-up-amplifier.html#post4290837

 

[Stealth]

Hi guys I would like to ask about the output power and/or other tech. specs of this beautiful project.
THX

 

[potepuh]

Take your time and read the thread UGS Power : it's U.P. you will found all the info here.

Ian,

If you feel this thread is a little cold...............have a look at this but
sit down first.

<<Youpi, on passe a l'U.P.>> - 29885985 - sur le forum <<Amplis et Preamplis>> - 1056 - du site Homecinema-fr.com

 

[Stealth]

thanks potepuh
I read this thread and thought it was less than “close 100w in 8 Ohms” :B

 

[neno70]

hi I gave a quick read to this thread and I think I understand that this amp UGS after the first w in class A become Ab, right ?? BUT FROM WHAT W MAXIMUM ON 8 OHM AND 4 OHM ?? THANK YOU

 

[Luke]

hi I gave a quick read to this thread and I think I understand that this amp UGS after the first w in class A become Ab, right ?? BUT FROM WHAT W MAXIMUM ON 8 OHM AND 4 OHM ?? THANK YOU

Yes it can operate in class A and then after that AB. You can decide when it goes to AB by the amount of bias you set.
8 ohm and 4 ohm are both possible.

 

[neno70]

Yes it can operate in class A and then after that AB. You can decide when it goes to AB by the amount of bias you set.
8 ohm and 4 ohm are both possible.

what is its maximum power in W?

 

[Itsmee]

what is its maximum power in W?

Read the first post.

 

[Luke]

I think Chef meant 100W into 4 Ohms not 8. I calculate 50 watts into 8 Ohm.

 

[Zen Mod]

think AB

rails are 23Vdc

say that output swing is few volts shaved from that ....... so 40Vpp, roughly

twice that, amp being differential/bridged , so 80Vpp

in my book, that's exactement 100W/8R

 

[Luke]

sorry, I got 25 w unbalanced from 23v rails and doubled it for balanced as it has twice swing. This is wrong.

 

[neno70]

ok thanks to everyone, I did not know this project ...

 

[neno70]

ok thanks to everyone, I did not know this project ...

P.S. with this end you must use only balanced connections, or you can also use unbalanced (rca) ?? THANK YOU

 

[aspringv]

I believe you can bridge one of the balanced connections to ground and you're good to go; albeit at a worse performance level.

I do have to say this is a doozy of a DYI project. A bit beyond me, so I'ts probably just as well I've never been able to get the boards or gerbers

...and I've still the UGS pre to do one day... (must learn to smd solder!)

 

[Zen Mod]

it is possible to use/wire any of inputs for SE/RCA

also , it is possible to use/wire outputs for both SE and BAL , and use either or both in same time

 

[neno70]

hi all, I'm looking for transistors 2sk389bl and 2sj109bl on ebay are still there but at very expensive prices, there are alternatives to replace them?

 

[Zen Mod]

2sk170 and 2sj74

Sticky thread on top of forum

 

[aspringv]

Or better yet!

Linear Systems Matched LSJ74/LSK170 JFET pairs (Grade B) – diyAudio Store

 

[neno70]

Or better yet!

Linear Systems Matched LSJ74/LSK170 JFET pairs (Grade B) – diyAudio Store

hello, ok ... but, question, the 2sk389-bt and the 2sj109-bt year 7 pins in the gerber file of the pcb and so .. while the LSJ74 / LSK170 JFET in the year only 3 .... are they okay? thank you