[quote author="Emperor-TK"]Has anyone ever resolved these questions? I just finished one channel of the EQ, with Gustav's latest board (rev 5?) stuffed according to the silkscreened legend. Everything works, but I also have the extra gain everyone else does. So the two unresolved calrec issues seem to be:
1.
Extra gain. Has anyone tried swapping the 5.1K's for 1.5K's? However, I might actually use this gain to my advantage, as a make-up gain when cutting dB. I plan on putting an attenuation pot on the output (unless there is a better approach availible for output gain control).
2.
Backwards polarized caps. Tracing the layout I find two elecrolytic and two tants that don't agree with the schematic. They are the 22u and 33u located beneath the lo-mid Q switch, and the 22u and 33u located below the Hi freq dB pot (33u not on latest rev). Gustav, I can't see the pics that you posted earlier. Is this what you found too? Finally, are there any issues with these caps being backwards if they aren't seeing a strong DC bias?
An by-the-way, the EQ sounds absolutely wonderful.[/quote]
This is what I have found also. "the 22u and 33u located beneath the lo-mid Q switch" the + is labeled wrong on gustav pcb and perhaps the pdf since I believe his pcb was printed from that . According to the schematic it is reverse of the + printed on the pcb.
Jacob & Gustav may want to take note of this if they havent corrected this already. If you could take a minute and confirm this and let me know if i am just blind.
Also there are a few + that did not show up on the pcb, but looking at the schematic will show you the polarity in which they should be oriented.