Piotr
Well-known member
Hi !
I've got 4 Auditronics 110B modules to rack.
I've already put two in a rack but they're not working properly. So I'm seeking for some advices and help !!! I'll describe the build and the problems as clearly as I can...
Here's the schematic link I've found in another thread on the topic: http://avensonaudio.com/tech/auditronics/audiotronics_110b.pdf or http://www.mediafire.com/?6ymbzyi2txv
As far as the power supply goes everything seems ok. I've used JLM Audio's AC/DC along with a 230V/2x15V toroid. http://www.jlmaudio.com/
The voltage rails are correct (+15V, -15V and 48V for phantom power). I've connected +15V to P2-1, -15V to P2-2, ground to P1-4). I've jumpered the +15V rail to the logic +24V rail (P1-15, while P1-14 goes to ground).
I've connected the input XLR via a JLM Go-Between (pad, phase and phantom switches) to the mic input, input A, on the module (P2-14 and 15, ground to P1-5).
The output (P1-7 and P1-3) goes straight to a Lundahl LL1517 transformer (www.lundahl.se/pdfs/datash/1517.pdf) I've installed on a home made PCB as on their application white paper (+ to pin 1, - to pin 4, 3 connected to 6, and on the other side to the XLR, + to pin 7, - to pin 11, ground to pin 9, 8 connected to 12).
I've changed 6 dip tantalum capacitors (C8, C9, C0, C11, C14, C16) just to be on the safe side of things... They're the bright orange ones.
I've also changed two resistors (R1 and R2 from whatever they were to 6.8K) as Joe from JLM advised in another Auditronics thread. They're the blue ones on the right...
Now, my first question is that of the output control. The modules have a "from fader" and "to fader" connections. If the connection is broken, no signal outputs. I've experimented with different values of resistors to simulate a connected fader (10K for example). This allows the module to output signal. But this signal is distorted and there also seems to be a grounding issue. I've got no idea of what's wrong...
Obviously I must have gone wrong somewhere, I'm pretty new to electronics so there are aspects of all this I surely don't understand...
I'll try to post pictures of the build later on and I'm open to all your remarks, suggestions and insight on this racking job !!!
Thanks a lot ! Piotr.
I've got 4 Auditronics 110B modules to rack.
I've already put two in a rack but they're not working properly. So I'm seeking for some advices and help !!! I'll describe the build and the problems as clearly as I can...
Here's the schematic link I've found in another thread on the topic: http://avensonaudio.com/tech/auditronics/audiotronics_110b.pdf or http://www.mediafire.com/?6ymbzyi2txv
As far as the power supply goes everything seems ok. I've used JLM Audio's AC/DC along with a 230V/2x15V toroid. http://www.jlmaudio.com/
The voltage rails are correct (+15V, -15V and 48V for phantom power). I've connected +15V to P2-1, -15V to P2-2, ground to P1-4). I've jumpered the +15V rail to the logic +24V rail (P1-15, while P1-14 goes to ground).
I've connected the input XLR via a JLM Go-Between (pad, phase and phantom switches) to the mic input, input A, on the module (P2-14 and 15, ground to P1-5).
The output (P1-7 and P1-3) goes straight to a Lundahl LL1517 transformer (www.lundahl.se/pdfs/datash/1517.pdf) I've installed on a home made PCB as on their application white paper (+ to pin 1, - to pin 4, 3 connected to 6, and on the other side to the XLR, + to pin 7, - to pin 11, ground to pin 9, 8 connected to 12).
I've changed 6 dip tantalum capacitors (C8, C9, C0, C11, C14, C16) just to be on the safe side of things... They're the bright orange ones.
I've also changed two resistors (R1 and R2 from whatever they were to 6.8K) as Joe from JLM advised in another Auditronics thread. They're the blue ones on the right...
Now, my first question is that of the output control. The modules have a "from fader" and "to fader" connections. If the connection is broken, no signal outputs. I've experimented with different values of resistors to simulate a connected fader (10K for example). This allows the module to output signal. But this signal is distorted and there also seems to be a grounding issue. I've got no idea of what's wrong...
Obviously I must have gone wrong somewhere, I'm pretty new to electronics so there are aspects of all this I surely don't understand...
I'll try to post pictures of the build later on and I'm open to all your remarks, suggestions and insight on this racking job !!!
Thanks a lot ! Piotr.