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Old 16th April 2007, 04:08 PM   #1
Jhovis is offline Jhovis  United States
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Default fe 103 notch filter

I have lost a diagram I had for a notch filter. I've searched here and didn't find it either. Does anyone have a link with a diagram to making a notch filter for the fe103?
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Old 16th April 2007, 04:16 PM   #2
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Hi Jeff,
the filter for the late and lamented RS40-1197 might be a starting point.
.25mH 3.9ohms 6.8yF

I hope this helps a bit.

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Old 16th April 2007, 04:51 PM   #3
Jhovis is offline Jhovis  United States
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Thanks Pit,
I also found this. The address is similar to your name...is this your page?: http://hometown.aol.de/hphinder/homepage/index.html

Look at the bottom of the page. I assume I run this in series off the positive speaker terminal?
Thanks,
Jeff
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Old 16th April 2007, 05:22 PM   #4
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Jhovis,

As you probably know there are two types of notch filters, series and parallel. The parallel unit runs the notch elements in parallel but in series with the driver. This is the one Pit is most likely discussing.

The series unit runs the notch elements in series but are paralleled to the driver. This is most often used for impedance matching and is less commonly used to actually notch. He can confirm this.

EDIT: I noticed he explains this in his site and yes he is talking about a a parallel filter.
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Old 16th April 2007, 05:38 PM   #5
Jhovis is offline Jhovis  United States
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Thanks Cal,
Yes, I'll make the filter parallel and run it in series with the driver.
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Old 16th April 2007, 06:02 PM   #6
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Jeff,
this is crazy! I've given up aol some five years ago and they still have that thing on their server?
The values shown on that page are for the 103Sigma which is quite a different animal - to save money, try the 1197 values first and play with the resistor. A higher value gives you a deeper notch - it's a matter of personal taste and favourite (or enforced) SPL level whether you shoot for ~linear or a slight "loudness" effect.

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Pit
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Old 16th April 2007, 09:43 PM   #7
holdent is offline holdent  Canada
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What response peak are you trying to control? As usual the Fostex published frequency response is "generous" but there seems to be a peak between 7000 to 9000 Hz. Is this the one?
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