C.B. - Boudio
Well-known member
I have in the last couple of months been trying to design some equipment. My plan is to set up a ultra-low-budget studio with later 1950s-early 1960s-inspired equipment. I want to do most of it by myself, which translates into 'all except microphones and recorders', so the preamp/mixer, EQs, and compressors. For the compressor, I will probably use the 'mix bus compressor' as now being built on the forum.
My last - and maybe least-embarrasing! - attempt to design the mentioned equipment is this small 4-into-2 mixer.
It features an EF86 and an ECC82 per channel, plus a ECC81 in the master-section and an EM87 as a peak indicator (I will use also normal VU-meters, maybe I wil just make a scale on a regular mA-meter).
Per channel, there is also a rudimentary equalizer, not as a precise kind of adjustment but more like some knobs that may affect the frequency response, to put it that way.
Transformers will be bridgeable, so I can leave them out (because of budget - it must still be decent!), by means of a 7-pin DIN connector; each audio transformer will have its own subchassis, connected by such a plug.
Every connection between 'modules' will be patchable.
Here are the schematic drawings. If there is something you don't understand, feel free to ask of course.
View attachment 1710526725764.jpeg
View attachment 1710526769936.jpeg
My last - and maybe least-embarrasing! - attempt to design the mentioned equipment is this small 4-into-2 mixer.
It features an EF86 and an ECC82 per channel, plus a ECC81 in the master-section and an EM87 as a peak indicator (I will use also normal VU-meters, maybe I wil just make a scale on a regular mA-meter).
Per channel, there is also a rudimentary equalizer, not as a precise kind of adjustment but more like some knobs that may affect the frequency response, to put it that way.
Transformers will be bridgeable, so I can leave them out (because of budget - it must still be decent!), by means of a 7-pin DIN connector; each audio transformer will have its own subchassis, connected by such a plug.
Every connection between 'modules' will be patchable.
Here are the schematic drawings. If there is something you don't understand, feel free to ask of course.
View attachment 1710526725764.jpeg
View attachment 1710526769936.jpeg