VBIGC T-net with active x-over ?

Will · 16th June 2005, 06:44 AM

How do I/ or is it possible to incorporate a 2nd order x-over (300hz) filter between the buffer section and the op-amp ? This would simplify things as I already have 2 of these amps and I would like to run my 3 way speaker actively crossing at 300hz between the woofer and mid-tweet.

Will.

Franz G · 16th June 2005, 09:51 AM

Yes, you can do what you want!

The low pass filter is consisting of the 3K9 resistor and the 1n5 cap, in the showed schematics.

But be aware: should you change the value of the 3K9 resistor, you change the input-z and therefore in conjunction with the t-net the overall gain. The input-z in your schematic is 3K9+18K.

So, I recommend to calculate the gain with the excel sheet, available here:

T-network: the better feedback solution?

Kind regards
Franz

/Edit: be aware of the high pass filter, consisting of 3u3 coupling cap and 3K9+18K.

/second Edit: Sorry, I wrote about 1st order filters...

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Another VBIGC :)	Kermit	Chip Amps	15	26th June 2006 08:05 PM
An other VBIGC question	ebijma	Chip Amps	2	3rd April 2004 09:19 PM
what does the 1n3 cap in JLTi VBIGC do?	sandro600	Chip Amps	2	5th March 2004 07:40 AM
A Vbigc	Ropie	Chip Amps	19	11th February 2004 05:56 PM
VBIGC troubles...	sith	Chip Amps	17	21st January 2004 09:50 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

16th June 2005, 09:51 AM	#2
Franz G diyAudio Member Join Date: Jun 2004 Location: Bern / Switzerland	Yes, you can do what you want! The low pass filter is consisting of the 3K9 resistor and the 1n5 cap, in the showed schematics. But be aware: should you change the value of the 3K9 resistor, you change the input-z and therefore in conjunction with the t-net the overall gain. The input-z in your schematic is 3K9+18K. So, I recommend to calculate the gain with the excel sheet, available here: T-network: the better feedback solution? Kind regards Franz /Edit: be aware of the high pass filter, consisting of 3u3 coupling cap and 3K9+18K. /second Edit: Sorry, I wrote about 1st order filters...

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)