Power Supply
2-2
2.1
Power Supply
1) Make sure all external power supplies are turned off.
2) Connect an external power supply with the positive voltage set between
5 V and 15 V to the terminal 12 V (J8) on the EVM.
3) Connect the negative voltage to the terminal marked −12 V (J9), making
sure the negative voltage is set to the same magnitude as that of the
positive (i.e.,
±
5 V,
±
12 V,
±
15 V).
4) Connect the ground of the external supply to the terminal marked GND
(J7) on the EVM.
2.2
Inputs and Outputs
5) Ensure the signal source is turned off or set to a minimum.
6) Connect the left signal source to the RCA jack labeled LIN+ (J5), and the
right signal source to the RCA jack labeled RIN+ (J6).
7) Insert headphones into 1/4 inch headphone jack, J10.
8) If desired, RCA Jacks J1 and J2 may be used instead of the headphone
jack for load driving purposes. The RCA jacks and the headphone jack
should not be used together when both are driving a load. One may be
used to drive a load while the other is used for measurement purposes.
2.3
Power Up
9) Verify correct voltage polarity on the supplies.
10) Make sure the signal source is going into the positive inputs only. Do NOT
connect anything to the negative inputs—this shorts the output of the
signal source directly to ground (see schematic in EVM Circuit and Layout
section)
11) Turn on the power supply.
12) Turn on the signal source.
13) Adjust signal source level as needed.
