Samuel Groner
Well-known member
Hi
Got asked to design a little phantom power box to power two channels on a film camera (which does have XLR inputs) from a 9 V battery. After some searching I found the LT1073 to be a good match for this kind of application and I came up with the following circuit: [removed] and [removed].
The circuit is basically an adaption of the "1.5V to 5V Very Low Noise Step-Up Converter" shown on page 14 of the datasheet. As this is my first homebrew switching design I'd appreciate the opinion of the experts on this.
For the inductor I planned on the Wilco ITS471-VM (shielded torroid). What about the critical 100 uF capacitor? Linear recommends the Sanyo OS-CON type, but I did not find a source for them. Would using a 1 uF polyester film in parallel with a standard (Panasonic FC) low-ESR capacitor give similar results?
Thanks for your input!
[Edit: current revision of schematic 48V_box_r1.pdf and 50 mA version: 48V_DC-DC_50mA_r1.pdf]
Samuel
Got asked to design a little phantom power box to power two channels on a film camera (which does have XLR inputs) from a 9 V battery. After some searching I found the LT1073 to be a good match for this kind of application and I came up with the following circuit: [removed] and [removed].
The circuit is basically an adaption of the "1.5V to 5V Very Low Noise Step-Up Converter" shown on page 14 of the datasheet. As this is my first homebrew switching design I'd appreciate the opinion of the experts on this.
For the inductor I planned on the Wilco ITS471-VM (shielded torroid). What about the critical 100 uF capacitor? Linear recommends the Sanyo OS-CON type, but I did not find a source for them. Would using a 1 uF polyester film in parallel with a standard (Panasonic FC) low-ESR capacitor give similar results?
Thanks for your input!
[Edit: current revision of schematic 48V_box_r1.pdf and 50 mA version: 48V_DC-DC_50mA_r1.pdf]
Samuel