Passive summing mixer design
« on: October 07, 2018, 06:06:34 AM »
Hi Guys,

I designed this tiny PCB, this is a passive 8 x 2 summing mixer with a pcb mount DSUB25 connector. Circuits will be chained to build a 32 inputs summing mixer. I've been using that1512 for make up gain. I got very good results with it, sounds very clean and wide. I wanna try other circuits for comparison, i was thinking about testing my summing mixer with BA283 stage with a VTB1847 transformer, for more coloration. Any suggestions about other circutis i should try for make up gain?




'The only people not making mistakes are the people doing nothing'


Re: Passive summing mixer design
« Reply #2 on: October 07, 2018, 03:59:52 PM »
Do you have some mic pres?  Try out whatever you have on hand and see what you like. Personally I like the sound of API style makeup gain with passive summers.

Re: Passive summing mixer design
« Reply #3 on: October 08, 2018, 07:33:33 AM »
Thanks for your inputs guys,

Ian, this is very detailled, thank you for this doc!
I am using 10K resistors on standard channels
for 16 inputs, Rsh is 1153 ohms in my design (impedance is 600ohms and attenuation around 30dB)

I tried this with my 1073 clone and it sounds amazing, also tried it with cleaner preamps and it sounds fine too... unfortuinately, i have no tube preamp at hand but will definitely try this as soon as i can!

Re: Passive summing mixer design
« Reply #4 on: April 10, 2019, 05:16:40 AM »
Hy is er PCB or Girder file to by for this 8 x 2 summing mixer with a pcb mount DSUB25 connector?




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