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Old 14th December 2003, 10:23 AM   #1
wxn is offline wxn  Lithuania
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Question Equalizer - help needed

First of all, hello everyone. I'm relatively new to advanced (also relatively) electronics and this is my first more expensive and more complex project. I want to add a good sounding and nice looking 10-band equalizer to my stereo. I've searched the Internet for quit some time and came up with three different solutions:
1. Use a couple of all-in-one ICs like LA3600 in series to get 10 bands instead of 5. They are cheap, simple to use etc. But the THD is .03% typ and .1% max and filter frequencies are not adjustable as they are fixed to condenser values (which aren't always a perfect match).
2. Do the same thing but from separate components. Something like this with TL074 for the filters and NE5532 for output op-amp. This approach costs a bit more but allows to fine-tune filter resonant frequencies and the total THD (I suppose) is much smaller (even the "noisy" TL074 has .01%, compare to .03% of LA3600).
3. Replace op-amps in filters with transistors like this . This would lower the total price a lot but I'm concerned about transistor poerformance/noise in such applications. Do op-amps have any real advantages in this situation?
So which design should I choose? Any suggestions and hints are welcome. Thanks in advance and sorry for my crappy English.
Nothing is as simple as it seems
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Old 16th December 2003, 05:08 AM   #2
wxn is offline wxn  Lithuania
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C'mon people! Does my question sound so stupid, it doesn't even seem worth to give an answer? I really need your help.
Nothing is as simple as it seems
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Old 16th December 2003, 01:32 PM   #3
sreten is offline sreten  United Kingdom
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I really hope you have tried one in your system
before you go to all the trouble of making one.

Route 2 is the way to go IMO.

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Old 16th December 2003, 01:42 PM   #4
paulb is offline paulb  Canada
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Yup, it's a lot of work. Here's another design for you to look at:
Rod gives a reference at the end that might be interesting.
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