Dual Balanced Input Board (L314)

   The L314 Dual Balanced Input Board is a very high performance yet economical way to add pairs of balanced inputs to audio gear that has only unbalanced inputs. The board is relatively small at 2.75" x 1.2" and mounts using either double sided foam tape, or the supplied snap-in plastic mount. Each channel has a 14 dB pad on the input which can be jumpered in or out as required.

   This card is ideal for mounting in equipment racks such as those used in broadcast, recording or editing facilities.

Specifications

Input & Output Connections:
   screw terminal

Number of channels:
   2

Frequency response:
   (@+4dB output into 600ohms)
   20 Hz - 70 kHz

Input Impedance:
   50K Ohm (balanced)

Common Mode Rejection
   85 dB typical
   70 dB min 100 Hz - 20 KHz
   60 dB min 20 Hz - 100 Hz.

Gain:
   -14 dB or 0 dB (switchable)

Dimensions:
   2.75"L x 1.2"W

Power supply:
   +24 VDC nominal
   +16 VDC to +32 VDC single ended supply

Operating Temperature:
   -40 deg C to +85 deg C

Mounting:
   Double sided foam tape, or plastic snap-in-in mounting bracket

Note: this card is intended to be used with a +16 to +32VDC single ended power supply. We also manufacture a similar card (L328) which converts a single balanced input, and operates from a bipolar supply (+/- 15 VDC nominal).