I have a DDA D series modular console. It sounds ok. Pretty clean. Could do with a few mods though.
The main issue at the minute is the lack of tape monitor channels. My workaround is this....
I plan to take a direct out from the mic pre, send this to my MOTU interface and then return this via the line inputs on the desk. The MOTU has a 'cuemix' matrix that will give zero latency monitoring. I plan to leave the desk in line mode all the time, so as long as the computer is on, I will be able hear the mic channels. I dont see this being a problem.
Here is a schematic of the mic pre.
I guess that if I were to take a feed from the mic/line switch on the mic side this would give me an unbalanced output direct to the MOTU.
I would prefer balanced outputs. For this would I simply emlininate the TL072 IC1a circuit?
Would I use a transformer on the emitters of TR1 and TR2 and get rid of everything after the R22/R23 output balancing circuit?
Does anyone know what function the diodes serve?
Also I have already modded a couple of channels to have a transformer input. This was an optional extra for the console as shown in the diagram.
However the components C2/C3 R12/R13 C6/C7 R16/R17 C8/C9 all seem unneccesary. I wired the transformer primary to the junction of R6/C2 and R7/C3 and the secondary across C10, leaving the jumper wires open where the recommended DDA transformer would have sat.
The transformer used was a 'neve' type 10468 1k2:4k8. I havn't noticed any problems with the channel, and there is an improvement over the bass and a few extra dB of gain, but am I missing something without the extra capacitors in the path. As far as I'm aware less is more with components in the signal path.
There may be more questions to come about modding this desk, but for now I think it is enough to chew on.
Anyone have any thoughts on all this?
Thanks!!
The main issue at the minute is the lack of tape monitor channels. My workaround is this....
I plan to take a direct out from the mic pre, send this to my MOTU interface and then return this via the line inputs on the desk. The MOTU has a 'cuemix' matrix that will give zero latency monitoring. I plan to leave the desk in line mode all the time, so as long as the computer is on, I will be able hear the mic channels. I dont see this being a problem.
Here is a schematic of the mic pre.
I guess that if I were to take a feed from the mic/line switch on the mic side this would give me an unbalanced output direct to the MOTU.
I would prefer balanced outputs. For this would I simply emlininate the TL072 IC1a circuit?
Would I use a transformer on the emitters of TR1 and TR2 and get rid of everything after the R22/R23 output balancing circuit?
Does anyone know what function the diodes serve?
Also I have already modded a couple of channels to have a transformer input. This was an optional extra for the console as shown in the diagram.
However the components C2/C3 R12/R13 C6/C7 R16/R17 C8/C9 all seem unneccesary. I wired the transformer primary to the junction of R6/C2 and R7/C3 and the secondary across C10, leaving the jumper wires open where the recommended DDA transformer would have sat.
The transformer used was a 'neve' type 10468 1k2:4k8. I havn't noticed any problems with the channel, and there is an improvement over the bass and a few extra dB of gain, but am I missing something without the extra capacitors in the path. As far as I'm aware less is more with components in the signal path.
There may be more questions to come about modding this desk, but for now I think it is enough to chew on.
Anyone have any thoughts on all this?
Thanks!!