Some time ago there was some discussion about running mic pres on battery supplies. I have just built a small DC/DC converter that should make that possible...
You can see a photo here: http://stiftsbogtrykkeriet.dk/~mcs/DC-DC_con.jpg
It's the small vertical PCB (size 27*27mm).
The schematic is here: http://stiftsbogtrykkeriet.dk/~mcs/DC-DC_con.gif - straight from the data sheet...
With 11.8V in I get +21.4V and -20V out. There is some noise in the output - about 30mVpp at 33kHz. But I use a standard LM317/337 supply after the DC/DC converter, and in the +/-14V output I see no noise at all.
I have also tried running the converter with 8V in. At that voltage I get +14V and -13V out.
I don't know how much current the converter can supply. In my circuit it supplies the LM317/337 regulators and two OPA604 op. amps. The converter chip does get hot, so a small heatsink is probably a good idea.
Best regards,
Mikkel C. Simonsen
You can see a photo here: http://stiftsbogtrykkeriet.dk/~mcs/DC-DC_con.jpg
It's the small vertical PCB (size 27*27mm).
The schematic is here: http://stiftsbogtrykkeriet.dk/~mcs/DC-DC_con.gif - straight from the data sheet...
With 11.8V in I get +21.4V and -20V out. There is some noise in the output - about 30mVpp at 33kHz. But I use a standard LM317/337 supply after the DC/DC converter, and in the +/-14V output I see no noise at all.
I have also tried running the converter with 8V in. At that voltage I get +14V and -13V out.
I don't know how much current the converter can supply. In my circuit it supplies the LM317/337 regulators and two OPA604 op. amps. The converter chip does get hot, so a small heatsink is probably a good idea.
Best regards,
Mikkel C. Simonsen