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Old 24th January 2005, 07:49 PM   #1
Mlaen is offline Mlaen  Croatia
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Default Preamp for mosfet amp...

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?
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Old 24th January 2005, 08:55 PM   #2
JochenH is offline JochenH  Germany
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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
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Old 24th January 2005, 09:16 PM   #3
Mlaen is offline Mlaen  Croatia
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Thanx a lot!
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Old 24th January 2005, 09:28 PM   #4
zcolic2 is offline zcolic2  Croatia
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Ommit = zanemariti, izostaviti

Regards,
Zoran
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Old 24th January 2005, 09:57 PM   #5
Mlaen is offline Mlaen  Croatia
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Opa, ko bi rekao da ću primorca sresti ovdje!
Pozdrav iz Kraljevice
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Old 25th January 2005, 03:32 AM   #6
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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
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Old 12th February 2005, 04:35 AM   #7
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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.
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