BHI NEDSP900, Руководство пользователя

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NEDSP900 Development Board
4
1.3 General Specifications
Operating voltage: 8 to 16v d.c.
Note: While Current and Reverse Polarity protection has been built into the Power circuitry on this
PCB, please check that the power lead is connected with the correct polarisation before applying
power.
Audio Input Acceptance: Input – Stereo (Audio 1 – Plug Tip/ Audio 2 – Plug Ring)
8 Ohms at 2Watts RMS
32 Ohms at 32mW
10K Ohm at 600mV p-p
Balanced Audio Input amplifiers with Phantom Power facility have
been provisioned, but not populated on the PCB (See Appendix B)
Audio Outputs: Headphones/small speakers – 0.5 + 0.5 Watts into 8 Ohms
Line Out - Both channels 600 Ohms at up to 0dBV
Connections: Audio Input
Mono Microphone Input
Line Output
Headphone/ Low power Speaker Output
Power 2.1mm Coaxial Power Jack
Various other connections using 0.1” connectors, mainly Molex KK,
have been provisioned for monitoring and control purposes
Switches 4 off 4 Pole DIL Switches have been provided for the purpose of Gain
and Noise Reduction control
Indicators: Power ON
Audio 1 Overload
Audio 2 Overload
Important: Take appropriate Electro-Static precautions before handling the PCB and while
making any additions or changes to the PCB components.
2.0 The Inputs
There are two main input sockets SK6 and SK7 that allow various levels
of signal to be accommodated. Also, there are two balanced audio
input amplifiers with Phantom Power capability. These amplifier
circuits are included on the PCB, but not populated. The circuitry plus
some explanation and the parts list are provided in Appendix B.