clipping problem

maxpou · 25th January 2008, 07:41 PM

Hi all,
how polarised jfet for have a perfect clipping? i want to built a line stage preamp single ended with gain of 10-12 db but when i have my perfect gain i have a problem with my clipping, positive peak clip but not negative. Why? Somebody can help me! thank you! Maxpou

nitrate · 25th January 2008, 09:05 PM

We can't help you unless you post a circuit diagram of what your trying to do.

Leigh

maxpou · 25th January 2008, 09:47 PM

Hi Nitrate,
i have this problem with one jfet. Schematic is a exemple. thank you! Maxpou

AndrewT · 26th January 2008, 11:48 AM

Hi,
what is the voltage on the output?
How far can the output voltage swing until either rail starts to limit?
Can you move the quiescent bias voltage on the output to equalise the available swings to either supply rail?

richie00boy · 26th January 2008, 12:49 PM

The reason is that the constant current source needs a finite voltage across it to work properly.

25th January 2008, 07:41 PM	#1
maxpou diyAudio Member Join Date: Apr 2006 Location: Québec	clipping problem Hi all, how polarised jfet for have a perfect clipping? i want to built a line stage preamp single ended with gain of 10-12 db but when i have my perfect gain i have a problem with my clipping, positive peak clip but not negative. Why? Somebody can help me! thank you! Maxpou

25th January 2008, 09:05 PM	#2
nitrate diyAudio Member Join Date: Jun 2005 Location: England, Lancashire	We can't help you unless you post a circuit diagram of what your trying to do. Leigh __________________ The perfect amplifier is a piece of wire with gain....

26th January 2008, 11:48 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, what is the voltage on the output? How far can the output voltage swing until either rail starts to limit? Can you move the quiescent bias voltage on the output to equalise the available swings to either supply rail? __________________ regards Andrew T.

26th January 2008, 12:49 PM	#5
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	The reason is that the constant current source needs a finite voltage across it to work properly. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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