Gyraf Calrec PQ1549 DIY Equalizer

Projects > Gyraf Calrec PQ1549 DIY Equalizer

The PQ1549 is a solid-state, parametric eq from the Calrec UA-8000 console. Gyraf adapted the eq for DIY by substituting modern components, scrapping the preamp section, improving the opamps, and adding balanced inputs and outputs. Gyraf provides the basic documentation on his site, and Magnus Johanasen provides a great, step-by-step guide for beginners attempting the project.

Images courtesy of Gyraf

Notable Features:

  • Designed to employ only modern, easy-to-obtain components
  • 4-band fully parametric
  • High-pass and low-pass filters

Price: No products available (self-etch)

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2 thoughts on “Gyraf Calrec PQ1549 DIY Equalizer

  1. This uses the LM833 correct? I’m having a bit of trouble reading the schematic. Is there anything easily substitutable?

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