Documentation for my filter
Hi,
I wrote a manual and a thing on sallen and key filters
Manual:
http://www.delta-audio.com/Manualer/Active filter one ver 1.0 dokumentation.pdf
Schematics:
http://www.delta-audio.com/Manualer/Active filter one ver 1.0 schematics.pdf
Sallen and Key formulars:
http://www.delta-audio.com/Manualer/Sallen And Key ver 1.0.pdf
Use them if you want to
\Jens
Hi,
I wrote a manual and a thing on sallen and key filters
Manual:
http://www.delta-audio.com/Manualer/Active filter one ver 1.0 dokumentation.pdf
Schematics:
http://www.delta-audio.com/Manualer/Active filter one ver 1.0 schematics.pdf
Sallen and Key formulars:
http://www.delta-audio.com/Manualer/Sallen And Key ver 1.0.pdf
Use them if you want to
\Jens
Layout files
Hi,
I just uploaded the layout files for the filter to my homepage.
They can be found at:
http://www.delta-audio.com/Active filter one.htm
Enjoy!
\Jens
Hi,
I just uploaded the layout files for the filter to my homepage.
They can be found at:
http://www.delta-audio.com/Active filter one.htm
Enjoy!
\Jens
Boards arrived wohoo!
Hi,
Boards arrived today.
Here is a pic
\Jens
Hi,
Boards arrived today.
Here is a pic
An externally hosted image should be here but it was not working when we last tested it.
\Jens
PC based measuring system
Hello all,
I have now assembled one channel of the PCB, but now I would like to measure the frequency and phase response. What is the easiest way of doing this (Without having to sit manually adjusting and measuring)
I’m looking for a PC based measuring system – any ideas?
Thanks
\Jens
Hello all,
I have now assembled one channel of the PCB, but now I would like to measure the frequency and phase response. What is the easiest way of doing this (Without having to sit manually adjusting and measuring)
I’m looking for a PC based measuring system – any ideas?
Thanks
\Jens
Progress at last
Hey all,
I have been busy on the filter for the mox clone, but have now had time to test this filter.
Initial testing has been performed without any problems, this includes the function of HP, LP and EQ sections.
The measured frequency response is within +-0.2 dB of the calculated witch is pretty much expected. I don't have any pictures of the measurement, but as soon as I get some I'll post them here.
\Jens
Hey all,
I have been busy on the filter for the mox clone, but have now had time to test this filter.
Initial testing has been performed without any problems, this includes the function of HP, LP and EQ sections.
The measured frequency response is within +-0.2 dB of the calculated witch is pretty much expected. I don't have any pictures of the measurement, but as soon as I get some I'll post them here.
\Jens
Jens, audiotester is a great cheap ($30) application that even has a shareware version. It can easily do swept sine bandwidth measurements, very nice for crossover testing.
I am still using version 1.4.
http://www.audiotester.de/
I am still using version 1.4.
http://www.audiotester.de/
Try
http://www.spectraplus.com
for crossover testing. If you use white noise for excitation and the dual channel transfer function mode you can generate precise curves.....even at low frequencies.
Works with any soundcard and the 30-day version is free.
Davey.
http://www.spectraplus.com
for crossover testing. If you use white noise for excitation and the dual channel transfer function mode you can generate precise curves.....even at low frequencies.
Works with any soundcard and the 30-day version is free.
Davey.
Measuments
Hello
I have added a picture of the freq response to the website.
\Jens
Hello
I have added a picture of the freq response to the website.
An externally hosted image should be here but it was not working when we last tested it.
\Jens
Hi,
Here is a picture of the semi stuffed module I used for the measurements.
All opamps in the signal path are Philips NE5532
\Jens
Here is a picture of the semi stuffed module I used for the measurements.
An externally hosted image should be here but it was not working when we last tested it.
All opamps in the signal path are Philips NE5532
\Jens
Caps and Resistors.
I used 5-10% caps and measured their value using a smart cap meter from Monacor it was about 70US$ and works great.
I just calculated the caps needed and found the approx value by means of simply going through a couble of caps - not a lot of work really.
I used 5-10% caps and measured their value using a smart cap meter from Monacor it was about 70US$ and works great.
I just calculated the caps needed and found the approx value by means of simply going through a couble of caps - not a lot of work really.
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