3-way crossover

MaXiZ · 18th June 2005, 04:45 PM

I've build this...
http://sound.westhost.com/project09.htm
But i've a problem.
When i connect +/- on -v side i've +0.5..
I've replace ALL the TL082 with new one... some idea?
PSU IS:
LM7815/7915 and 2.000uF capacitor.
The "main" to LM come from my Power Amplifier PSU...

djk · 19th June 2005, 12:47 AM

Which specific opamp has the .5V?

Check the ground for the 100K input bias resistor.

The 3-way version of the crossover is hooked up wrong.

The correct order is:

Input buffer to HP and LP for your lower crossover point, LP to an all-pass filter set to your upper crossover point (may be omitted if more than 3 octaves apart). The HP from the lower crossover point the feeds the upper crossover HP and LP.

This may seem wrong as the HF goes through more opamps, but if you do it the ESP way the group delay will be way off.

18th June 2005, 04:45 PM	#1
MaXiZ diyAudio Member Join Date: Jun 2003 Location: Italy	3-way crossover I've build this... http://sound.westhost.com/project09.htm But i've a problem. When i connect +/- on -v side i've +0.5.. I've replace ALL the TL082 with new one... some idea? PSU IS: LM7815/7915 and 2.000uF capacitor. The "main" to LM come from my Power Amplifier PSU...

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19th June 2005, 12:47 AM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	Which specific opamp has the .5V? Check the ground for the 100K input bias resistor. The 3-way version of the crossover is hooked up wrong. The correct order is: Input buffer to HP and LP for your lower crossover point, LP to an all-pass filter set to your upper crossover point (may be omitted if more than 3 octaves apart). The HP from the lower crossover point the feeds the upper crossover HP and LP. This may seem wrong as the HF goes through more opamps, but if you do it the ESP way the group delay will be way off.

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