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BOSOZ balanced pre - for novice - questions
BOSOZ balanced pre - for novice - questions
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Old 25th January 2017, 12:31 PM   #11
andrea7617 is offline andrea7617  Italy
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In the image there is the solution without P3-P4 using 5k resistors soldered on the board to XLR out.
P5 should be changed with fixed resistor that, added to R15, gives the gain.
In this case I may use only pot in the input.
Is it correct???
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Old 25th January 2017, 01:01 PM   #12
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BOSOZ balanced pre - for novice - questions
post your reference schematic and proper picture of pcb

your sketch in #10 is not good interpretation of what I meant

imagine that these 5K fixed resistors are substituting 5K pots , set on max.
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Old 25th January 2017, 01:20 PM   #13
andrea7617 is offline andrea7617  Italy
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Quote:
Originally Posted by Zen Mod View Post
post your reference schematic and proper picture of pcb

your sketch in #10 is not good interpretation of what I meant

imagine that these 5K fixed resistors are substituting 5K pots , set on max.
Yes, 5K fixed resistors sobstitute 5K post. I understood it in this way.
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Old 25th January 2017, 01:23 PM   #14
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BOSOZ balanced pre - for novice - questions
so that means - solder resistor on top and bottom pot pcb pads

take output signal from top pot pcb pad , or take it from wiper pad , but short wiper and top pads

as you sketched it , you're having 5K series (to signal) resistors ...... and that's wrong interpretation
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Old 25th January 2017, 01:35 PM   #15
andrea7617 is offline andrea7617  Italy
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Click the image to open in full size.
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Old 25th January 2017, 01:40 PM   #16
andrea7617 is offline andrea7617  Italy
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Thank you Zen Mod.
This should be correct...Each resistor has one leg soldered on top pcb and other leg soldered on bottom pcb. So each out signal hole is shorted with 5k fixed resistor.
Finally I solder the signal cable on the top (or bottom, it's the same) of the out connection on the pcb to the xlr. May I do the same thing (put 5k resistor) with the ground connection thar link pcb to xlr?
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Old 25th January 2017, 01:58 PM   #17
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BOSOZ balanced pre - for novice - questions
you're getting it wrong

as I said :

Quote:
post your reference schematic and proper picture of pcb


this way I can't help you , because I'm not familiar with that pcb and I can just guess what P5 is and what proper pcb pads are
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Old 25th January 2017, 02:05 PM   #18
andrea7617 is offline andrea7617  Italy
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I will use the same pcb of Nelson Pass https://www.passdiy.com/project/prea...zen-line-stage
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Old 25th January 2017, 02:30 PM   #19
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BOSOZ balanced pre - for novice - questions
replace R11 and R12 with 5K values (instead of 100K)

connect +Out pcb pad to XLR Pin 2
connect -Out pcb pad to XLR Pin 3
connect GND to XLR pin 1

in place of P5 - you can temporary use either pot or trimpot , and when you set gain adequate for your needs , measure it and replace with fixed resistor(s)
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Old 25th January 2017, 02:32 PM   #20
andrea7617 is offline andrea7617  Italy
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Quote:
Originally Posted by Zen Mod View Post
replace R11 and R12 with 5K values (instead of 100K)

connect +Out pcb pad to XLR Pin 2
connect -Out pcb pad to XLR Pin 3
connect GND to XLR pin 1

in place of P5 - you can temporary use either pot or trimpot , and when you set gain adequate for your needs , measure it and replace with fixed resistor(s)
Great!!!
Thanks a lot!!!
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