ramshackles
Well-known member
I was wondering if anyone has ever built any of the modules or indeed a mixer from "project 30" on the ESP pages:
http://sound.westhost.com/project30a.htm
I was thinking about doing a simple N into 2 mixer, without the tone control section and I have a few questions. Attached is a redrawn schematic (copied straight from ESP) of the transformer balanced input stage and the fader/pan stage.
Here are my questions
Input stage:
1. I noticed that the transformer driving a 5534 opamp for gain is quite similar to the ISA110 input stage, although the 110 uses 2 5534's; one for a stepped gain and a further stage for trimming. Would there be any noticeable advantage to adjusting the circuit to something more similar to the 110?
2. Are there any alternative transformers to the pricey JT-16-A? I've had a look on lundahl & cinemag and the only possibilitie I've come up with would be this:
http://cinemag.biz/mic_input/PDF/CMMI-2C.pdf
Fader stage:
1. I'm guessing it would be fine to just tap off as many auxes as desired in the same manner given in the original schematic
2. The channel insert point could just become a direct output option (as there is no eq) with no changes in the schematic - am I right here?
3. In small signal audio, Douglas Self is pretty scathing about the type of panpot setup used here. I include his proffered panpot solution as a second option - it seems like there would be no problem in just 'plugging' in straight in, provided the routing/mix resistors are then set correctly
Anyone had a look at this project?
http://sound.westhost.com/project30a.htm
I was thinking about doing a simple N into 2 mixer, without the tone control section and I have a few questions. Attached is a redrawn schematic (copied straight from ESP) of the transformer balanced input stage and the fader/pan stage.
Here are my questions
Input stage:
1. I noticed that the transformer driving a 5534 opamp for gain is quite similar to the ISA110 input stage, although the 110 uses 2 5534's; one for a stepped gain and a further stage for trimming. Would there be any noticeable advantage to adjusting the circuit to something more similar to the 110?
2. Are there any alternative transformers to the pricey JT-16-A? I've had a look on lundahl & cinemag and the only possibilitie I've come up with would be this:
http://cinemag.biz/mic_input/PDF/CMMI-2C.pdf
Fader stage:
1. I'm guessing it would be fine to just tap off as many auxes as desired in the same manner given in the original schematic
2. The channel insert point could just become a direct output option (as there is no eq) with no changes in the schematic - am I right here?
3. In small signal audio, Douglas Self is pretty scathing about the type of panpot setup used here. I include his proffered panpot solution as a second option - it seems like there would be no problem in just 'plugging' in straight in, provided the routing/mix resistors are then set correctly
Anyone had a look at this project?