The L328 Single Balanced Input Board is a very high performance yet economical way to add balanced inputs to audio gear that has only unbalanced inputs. The board is relatively small at 1.75″ x 0.625″ and can be mounted anywhere using double sided foam tape, or it is also designed so it can be soldered directly to the back of any standard XLR type connector as shown in the picture below.
This convenient card is ideal for mounting in equipment racks such as those used in broadcast, recording or editing facilities.
Specifications
Input & Output Connections:
drilled solder pads
Frequency response:
@+4dB output into 600ohms)
20 Hz – 70 kHz
Input Impedance:
50K Ohm (balanced)
Common Mode Rejection:
85 dB typical
80 dB min 100 Hz – 20 KHz
70 dB min 20 Hz – 100 Hz
Gain:
-14 dB or 0 dB (switchable)
Dimensions:
1.75″L x 0.625″W
Power supply:
+/- 15 VDC nominal
+/- 10 VDC to +/- 17 VDC bipolar supply
Operating Temperature:
-40 deg C to +85 deg C
Mounting:
Double sided foam tape, or solder directly to XLR connector
Note: this card is intended to be used with a bipolar supply (+/- 15 VDC nominal). We also manufacture a similar card (L314) which converts two balanced inputs, and operates from a +16 to +32VDC single ended power supply.
Note: This card is designed to be mounted inside a chassis as is. If it is required to drive any length of shielded cable, simply insert a 100 ohm resistor at the card’s output (because the op-amp is not capable of directly driving a capacitive load).