Gyraf Audio EQ

Posted on Feb 4, 2014

This pages contain information about building your own version of the Calrec PQ1549 Equalizer, the one found in the Calrec `Polar` desk. This EQ is one of my absolute favorites when it comes to standard IC-based types, so I made this project to make it possible for more people to experience these qualities. I will try to update this page reguarly

Gyraf Audio EQ
Click here to download the full size of the above Circuit.

if anyone shows interest in its topics. Comments and corrections are welcome, but I can`t promise to reply to all mail. If you do this project and describe the process on your webpage, I`ll be more than happy to add a link here, so others can benefit from your experiences. Notice that all information, schematics, layouts etc. are supplied "as is", and that we can in no way be held responsible for its acurateness, functionality or even safety. Gyraf Audio shall not be responsible and disclaims all liability for any loss, liability, damage (whether direct or consequential) or expense of any nature whatsoever which may be suffered as a result of or which may be attributable, directly or indirectly, to the use of or reliance upon any information, links or service provided through this website. Also you should take extreme caution when working with mains voltages. These voltages are lethal, and the smallest error will be chatastrophic. And we like you to stay alive and well, so you can help other people sharing our bizarre interest for building retro-pro-audio-equipment. The Calrec PQ1549 is a classic no-nonsense parametric equalizer from the famous (and huge!) Calrec "Polar" desk, that were only manufactured in very small numbers. I believe that there`s less than 15 desks like this left worldwide. This is an adaption of the original Calrec PQ1549 module to components and parts that are available (hopefully) everywhere. Adaption...

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