Preamp for mosfet amp...

[Mlaen]

I build this preamp: http://www.sound.westhost.com/project97.htm
And for now all semes to be OK but I have a few questions...
Why is SW1 for? It makes no difference in my preamp?
I'm not sure what the word ommit means in english - short circut or increase value? (it's about R119 to get more dBs)

Now I used tl072 but I'll get some better... which ones do you recomend?

[JochenH]

Hi,

ommit means "leave away / don't stuff", this gives you an increased range for the bass and treble cut / boost.
As a replacement for the TL072 you will get different comments, if you want to stay on budget / stay cheap, try an OPA2134 from TI/BB.

Jochen

[Mlaen]

Thanx a lot!

[zcolic2]

Ommit = zanemariti, izostaviti

Regards,
Zoran

[Mlaen]

Opa, ko bi rekao da ću primorca sresti ovdje!
Pozdrav iz Kraljevice

[DarkHorse]

Hi,
I don't like the tone section,it is navigative feedback circuit form,although It can tone more obviously,but it isn't good to listening music for long time,it will make you feel so impatiently.
I commend you to build a attenuation tone circuit form.It sounds so naturally...
and sorry for my poor english!
regards,
WINCO

[johnthetweeker]

SW1 is for tone defeat, as mentioned on the schematic. It is unlikely to make a difference when the bass & treble pots are in middle (or 'flat') position.

I don't like this way of defeating the tone control, though - I'd prefer a simple switch that will bypass the whole stage.