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Symmetric Output

for USB Audio DAC

026

H. Sommen

This simple adapter circuit is specially intended for use with

the USB Audio DAC published in the December 2000 issue

of Elektor Electronics . With an easily implemented modifi-

cation, it is possible to make the output of the D/A converter

pseudo-symmetric, so that it can be connected to profes-

sional equipment having XLR line inputs. This will do even

more justice to the high quality of the USB Audio DAC.

The modification actually amounts to just adding a single

resistor (R11a) and changing the value of the existing resis-

tor at the output of the audio DAC (R11) from 100

K1

C14

R11

68 Ω

IC2.A

2

R12

1

R11a

68

3

Ω

XLR

014053 - 11

to 68

.

48

Elektor Electronics

12/2001

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SMALL CIRCUITS COLLECTION

Components C14 and R12 remain unchanged.

It is not difficult to make this change on the printed circuit

board of the audio DAC, but a bit of improvisation is nec-

essary. After replacing R11 with a 68-

tion of these two resistors to act as the signal return con-

nection (pin 3 of the XLR socket). The same operation must

also be carried out on the right channel, where the affected

resistors are labelled R16, R16a and R17.

version, unsolder

R12 and connect R11a in series with it. Bring out the junc-

(014053-1)

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