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Old 14th December 2010, 04:33 AM   #701
ljm_ljm is offline ljm_ljm  China
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This amplifiers makes me very disappointed.


I let him work 120K frequency, default output LPF significantly smaller.


Have high frequency output.


Set to 330K reasonable. But he has a focuses on the defects in practice test to find out


When the output is 20K sine signals over 10V peak. Field tube will work extremely unstable.


Serious would burn out.
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Old 14th December 2010, 05:17 AM   #702
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hi pafi and to all, i got an E ferrite core. which one on the picture should be used.

picture 1: original gap ang wires avoiding the gap
picture 2: both side of the E core adjusted to have a gap. how much gap?

regards,
coolet
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Old 14th December 2010, 03:08 PM   #703
Pafi is offline Pafi  Hungary
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coolet!

Both can be good. If original gap is enough, then choose Nr.1!

Quote:
how much gap?
lgap~L*Imax^2/Acore
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Old 14th December 2010, 09:19 PM   #704
RX5 is offline RX5  Philippines
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using an LCmeter is the best solution to get the right inductance..
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Old 14th December 2010, 09:40 PM   #705
Pafi is offline Pafi  Hungary
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This is a different question. Inductance can be set with any gap, but with improper gap it won't work as god as could have.
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Old 14th December 2010, 09:58 PM   #706
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E cores are the best .

Can I espect big power from PC core?
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Old 14th December 2010, 10:07 PM   #707
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If it is from a flyback transformer, with a big (1-2mm) airgap, and its at least 30mm, then you propably can.
EE cores are really good, ETD cores are similar, but more easy to wind.
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Old 14th December 2010, 10:15 PM   #708
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Yes, I agree. I will bay ETD34 core. 18 turns, no wire acros gap. what to use as coil?
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Old 15th December 2010, 12:46 AM   #709
ljm_ljm is offline ljm_ljm  China
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Default Excuse me

This is my production.


In the test output higher voltage > + - 15V Sine wave (20k hz)


Will appear MOSFET shut out of control.


I wonder what really have the person is tested

Whether it works in default 120K

Or a higher frequency
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Last edited by ljm_ljm; 15th December 2010 at 12:52 AM.
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Old 15th December 2010, 06:21 AM   #710
qsa is offline qsa  Germany
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The pcb wire from IR2110 Driver IC to Mosfets to long, as short as possibile
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