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Gyraf Audio - DIY Calrec EQ
https://www.gyraf.dk/gy_pd/calreq/calrec.htm
The PCB set for the PQ1549 consists of two 100x160mm "eurocard" pcb's, that are interconnected. The PCB's are single-sided, and carry all switches and pots, limiting wireing to input, output and PSU. Note, that a +/-18V, ~100mA power supply is needed, and not included here. If it seems that there's a need for it, I will do a pcb for that also..
Gyraf Calrec PQ1549 Equalizer PCB Kit | Analog Classics
https://analogclassics.com/product/calrec-pq1549-clone-pcb-kit/
A special thanks to Gyraf Audio for making this design available. We are an authorized dealer of these kits. “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.
Gyraf Calrec PQ1549 Equalizer - Gyraf Audio
https://www.gyraf.dk/gy_pd/calreq/calreq.pdf
Calrec PQ1549 by GYRAF compiled by Magnus Johansson Revision 1, 30-10-2002 RESISTORS: 22R 2 1K 5 1K5 4 1K6 1 3K3 2 3K9 1 4K7 2 5K1 1 6K8 2 7K5 2 8K1 1 10K 6 15K 4 20K 23 22K 2 24K 2 27K 4 43K 2 47K 2 100K 17 1M 2 POTS: 10K LIN, (maybe centre detent). (dB +/-) 4 2*100K NEG LOG (C-curve) (Frequency) 4 SEMICONDUCTORS:
Calrec PQ1549 parts list - Gyraf Audio
https://www.gyraf.dk/gy_pd/calreq/calreq_parts.htm
Revision #1, 31-10-2002. RESISTORS: 22R: 2: 1K: 5: 1K5: 4: 1K6: 1: 3K3: 2: 3K9: 1: 4K7: 2: 5K1: 1: 6K8: 2: 7K5: 2: 8K1: 1: 10K: 6: 15K: 4: 20K: 23: 22K: 2: 24K: 2 ...
Gyraf Calrec PQ1549 DIY Equalizer - DIYRE Wiki
http://wiki.diyrecordingequipment.com/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 Calreq EQ clone – pcb set – Pusherman
https://pushermanproductions.com/product/calreq-eq-clone-pcb-set/
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.
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