Looking for a circuit to switch between the 2 ref levels. Balanced +4 and unbalanced -10dBv. I hoped to find a simple circuit to to be able to switch between the two I haven't found anything yet. Would it just be a 12db attenuator for the -10dBv?
+4dBu to -10dBv Switching
- Thread starter RSRecords
- Start date
Help Support GroupDIY Audio Forum:
Since you didn't say, can I ASSUme you are talking about modifying an input to accommodate both +4 dBu balanced inputs and unbalanced -10 dBV (note the capital letter V denoting a 1V 0VU reference).
If you can accommodate balanced/differential inputs, the level difference is the obvious issue.
First, what is the nominal 0VU after this stage? that will determine if you need to add gain, or pad down too much level.
JR
If you can accommodate balanced/differential inputs, the level difference is the obvious issue.
First, what is the nominal 0VU after this stage? that will determine if you need to add gain, or pad down too much level.
JR
ruffrecords
Well-known member
Here is the schematic of a small PCB I designed to fit on nominal +4dBu balanced outputs that allow the level to be switched from +4dBu to -8dBu (-10dBV). Assuming to final load is a 10K line input then the balanced output needs to be able to drive a 2K4 load.
Cheers
Ian
Cheers
Ian
All good - but is it not preferable to simply accept the nominal balanced +4dBu signal then attenuate to the required line level? Assuming voltage rails are good for this.
Ok I was over complicating per usual. Current design operates at +4 but I wanted to allow for connections to -10 unbalanced equipment.
Outputs are impedanced balanced, so I'm not sure how that will affect things.
I'll draw up the schematic and see where I eventually get lost.
Outputs are impedanced balanced, so I'm not sure how that will affect things.
I'll draw up the schematic and see where I eventually get lost.
