https://www.fairchildsemi.com/datasheets/H1/H11F3M.pdf
H11F2M or H11F1M are rated at +-30V
EDIT
Updated schematic
Might want to use H11F2M or H11F1M which are rated at +-30V
https://www.fairchildsemi.com/datasheets/H1/H11F3M.pdf
H11F2M or H11F1M are rated at +-30V
EDIT
Updated schematic
Might want to use H11F2M or H11F1M which are rated at +-30V