muffy1975 said:.... and am worried that there is trouble ahead.
juanjovincenzo said:1.-For Calrec EQ PQ1549. what is the best opamp: LM833 or NE5532??? and
2.- The PCB Layouts Rev # 4 http://gyraf.dk/gy_pd/calreq/calreq.pdf, the copper PCBs are 100% functional to self-etch?
3 - Please, Jakob maybe you have the PDF file of the PCB copper layout of your Gyraf 4x Intrument Splitter to self etch??? if is possible to post it?
4 - Is your Tube HeadPhonesAmp DIY Project http://www.gyraf.dk/tmp/Tube_headphoneamp.pdf 100 % functional?
briomusic said:I finally got my CALREC eq to work (thanks to some hands-on help from a good friend) and I also noticed a jump in gain with all the band's level controls flat. as I quite like to have a gain control on an eq to compare with the untreated signal, I was thinking of inserting a dual gang pot instead of just changing the 10k resistors to 22k. so I tried the following mod:
This allows me to have resistances from 10k-32k and to make up for moderate cuts and/or boosts. Is this kosher or am I comitting untold crimes on input impedances etc? if - due to pot tolerances - I have a different resistance on the plus and minus rails, what would the effect be?
ETA: I ended up using dual rev log 100k pots (instead of 22k) for the gain (same as the ones spec'd for frequency) to get the required range.
Yes. Increasing resistance lowers gain of this stage.muffy1975 said:IS it the the two 10K resistors before this chaps idea of the 22k pot?
Are these the two 10K resistors that are also directly connected to the 47uf caps?
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