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Old 14th April 2013, 12:02 PM   #11
Aniket is offline Aniket  India
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Just make this and connect between your source and amplifier.
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Old 14th April 2013, 12:11 PM   #12
Aniket is offline Aniket  India
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Or use a trim pot in place of R10, as shown to vary your mid frequency.
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Old 15th April 2013, 12:38 AM   #13
Zero D is offline Zero D  United Kingdom
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Exclamation Corretion

@ Aniket

Hi, i havn't simmed etc your circuit, but i did notice the - Voltage Supply needs reversing

Regards
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Old 15th April 2013, 03:51 AM   #14
Aniket is offline Aniket  India
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Yup, my mistake, it just denotes +/-15V supply voltage. no more error's in the circuit.
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Old 16th April 2013, 05:39 PM   #15
chuck55 is offline chuck55  United States
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Thanks Aniket. I like the concept.

Is this a 1st order design or will there be phase shift?
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Old 16th April 2013, 05:44 PM   #16
Aniket is offline Aniket  India
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there will be no phase shift, as 2nd op amp would correct phase shift of 1st, making the output signal in phase with input signal.
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Old 30th November 2013, 12:02 PM   #17
chuck55 is offline chuck55  United States
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Since the line level tone controls provides so much audible distortion, I thought I would try one after the power amp. Like a regular crossover component. I got this info from Parts Express but they could only design for -9db. From my testing with equalizers, I know -9dB is much too high.
Does anyone here know what value I use to cut the center attenuation down to -4 to -5 dB? Here is what they gave me:

The low -3 dB frequency would be
600 Hz, the center frequency at 900 Hz, and the upper -3 dB
frequency at 1200 Hz. The amount of attenuation at the
center should be about 9 dB.

Capacitor: 33 uF (027-350)
Inductor: .8 mh (255-044)
Resistor: 2.4-ohms (004-2.4)

They are all twisted in parallel and connected to the plus speaker terminal.
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Old 30th November 2013, 04:46 PM   #18
sreten is offline sreten  United Kingdom
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Hi,

No way will a parallel LCR with 2.4R, in series with the driver give
-9dB. With Re near 3R = -5dB max , with Re near 6R = -3dB max.

rgds, sreten.
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Old 30th November 2013, 10:05 PM   #19
chuck55 is offline chuck55  United States
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Quote:
Originally Posted by sreten View Post
Hi,
with Re near 6R = -3dB max.rgds, sreten.
Thanks sreten. So with the capacitor and inductor values unchanged, do you mean switching to a 6 ohm resistor will give -3dB at the center?
What will the reduction be at the low 600hz and the high 1,200 hz?
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Old 22nd June 2014, 08:21 PM   #20
chuck55 is offline chuck55  United States
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I am confused. The circuits design by both jerluwoo and Aniket have two op-amps in them. Both circuits have a single input and a single output. So how is Aniket's a two opAmp design but jerluwoo is not?
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