Active Crossover

soundNERD · 20th September 2003, 02:22 AM

I need a low pass active X-over that crosses over @ about 150hz. I would like to use the LM324, because I have many of them, plus I don't need to worry about split supplies. What resistor and cap values would I need, and how would I assemble it? This is for the other project I posted, the stereo system for the sub output plug. Thanks for the help.

-Mike

Hybrid fourdoor · 21st September 2003, 10:55 AM

If you go to Linear Team's WinISD webpage and download the ISD program it has a active crossover tool in it. When it says which cap to use (says start will like 0.01uf or something), just enter a capacitor value and enter the crossover frequency and it will tell you which resistor values to use and it shows the schematic in a simplified manner. Its dirty, quick and cheap!

The capacitor part confused me for a while, cause I didn't knwo you had to enter that, and I didn't know that the capacitor could be constant.

zobsky · 21st September 2003, 05:33 PM

Quote:

Originally posted by Hybrid fourdoor
If you go to Linear Team's WinISD webpage and download the ISD program it has a active crossover tool in it. When it says which cap to use (says start will like 0.01uf or something), just enter a capacitor value and enter the crossover frequency and it will tell you which resistor values to use and it shows the schematic in a simplified manner. Its dirty, quick and cheap!

The capacitor part confused me for a while, cause I didn't knwo you had to enter that, and I didn't know that the capacitor could be constant.

ignorant question , ...but do you need a power supply for the WinISD active crossovers, ...didn't seem like it from using the software???

JoeBob · 21st September 2003, 06:05 PM

Yup, the opamps need to be powered, usually from +/- 15V or +/- 12V. In chematics the power suply pin sonnections are often omitted because it is just a given that they must be powered.

Hope that helps.

soundNERD · 23rd September 2003, 01:55 AM

I would like to use the LM325. Will that work? Also, it is connecting between the selector switch logic and the 3886 amps on the amp I am using in the amplifier I am building. It connects to the subwoofer out plug. I need to combine the left and right inputs also. How would I do it?

Thanks, Mike

soundNERD · 24th September 2003, 01:39 AM

Sorry, I meant LM324, not 325.

20th September 2003, 02:22 AM	#1
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	Active Crossover I need a low pass active X-over that crosses over @ about 150hz. I would like to use the LM324, because I have many of them, plus I don't need to worry about split supplies. What resistor and cap values would I need, and how would I assemble it? This is for the other project I posted, the stereo system for the sub output plug. Thanks for the help. -Mike

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21st September 2003, 10:55 AM	#2
Hybrid fourdoor diyAudio Member Join Date: May 2003 Location: Ft. Worth, TX	If you go to Linear Team's WinISD webpage and download the ISD program it has a active crossover tool in it. When it says which cap to use (says start will like 0.01uf or something), just enter a capacitor value and enter the crossover frequency and it will tell you which resistor values to use and it shows the schematic in a simplified manner. Its dirty, quick and cheap! The capacitor part confused me for a while, cause I didn't knwo you had to enter that, and I didn't know that the capacitor could be constant.

21st September 2003, 06:05 PM	#4
JoeBob diyAudio Member Join Date: Nov 2001 Location: Montreal, Canada	Yup, the opamps need to be powered, usually from +/- 15V or +/- 12V. In chematics the power suply pin sonnections are often omitted because it is just a given that they must be powered. Hope that helps.

23rd September 2003, 01:55 AM	#5
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	I would like to use the LM325. Will that work? Also, it is connecting between the selector switch logic and the 3886 amps on the amp I am using in the amplifier I am building. It connects to the subwoofer out plug. I need to combine the left and right inputs also. How would I do it? Thanks, Mike

24th September 2003, 01:39 AM	#6
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	Sorry, I meant LM324, not 325.