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.
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.
C'mon people! Does my question sound so stupid, it doesn't even seem worth to give an answer? 🙁 I really need your help.
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.
🙂 sreten.
before you go to all the trouble of making one.
Route 2 is the way to go IMO.
🙂 sreten.
Yup, it's a lot of work. Here's another design for you to look at:
http://sound.westhost.com/project75.htm
Rod gives a reference at the end that might be interesting.
http://sound.westhost.com/project75.htm
Rod gives a reference at the end that might be interesting.
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