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Old 13th February 2013, 07:11 PM   #8351
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Old 14th February 2013, 04:34 PM   #8352
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Here is the concept of the Cro Magnon Tube.
A volume control could be integrated ( or not ).
There are 3 different versions that have their pros and cons.
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File Type: jpg Cro Magnum Tube concept.jpg (52.8 KB, 294 views)
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Old 15th February 2013, 02:01 AM   #8353
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I have build an input stage that COULD work. DC conditions are rock solid so now i can try how much gain i can get out of it. I need a gain of about 300x to 400x at DC.
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Old 15th February 2013, 04:06 AM   #8354
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Bobby Blue Bland - Ain't No Love In The Heart Of The City (1974) - HQ on Vimeo
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Old 15th February 2013, 12:30 PM   #8355
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That song was used in the Lincoln car commercials. That's the only reason I know about it.
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Old 17th February 2013, 10:46 AM   #8356
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For whom it may concern (or be useful ) http://technologyinterface.nmsu.edu/...Fall09/011.pdf
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Old 17th February 2013, 11:14 AM   #8357
RCruz is online now RCruz  Switzerland
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Quote:
Originally Posted by FdW View Post
For whom it may concern (or be useful ) http://technologyinterface.nmsu.edu/...Fall09/011.pdf
Nice way to put it
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Old 17th February 2013, 11:31 AM   #8358
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i will study this, thanks.
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Old 17th February 2013, 11:59 AM   #8359
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Quote:
Originally Posted by FdW View Post
For whom it may concern (or be useful ) http://technologyinterface.nmsu.edu/...Fall09/011.pdf
Tanks a lot for that
Almost got spontaneous brain burn out caused by math symbols and 2 remaining brain cells being almost 50 proof.

I was going to use this
Transistor matching

and would welcome same advice please

If I place a 100 Hom's resistor where the picture shows the A meter
I can measure volt drop across the resistor Yes?
What would be the best value for the resistor?
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Old 17th February 2013, 12:42 PM   #8360
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You have to make sure that the resistor does not drop too much voltage.
Say you use a 9V battery and the Fet has an Idss of 10mA. You want to drop 2 V.
That makes the resistor U/I = R
2 / 0.01 = 200 Ohm
Your 100 Ohm whould drop 1V. That is ok too.
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