Nordic Star Products NRD24V1 manual Jumpers, Antenna

User Guide

C1R1

PC loudspeaker out

2.2u 1k

R2

47

C2

AIN

2.2u

Figure 9. PC output interface

3.2.2Jumpers

The application board can be set up to interface a headset microphone and loudspeaker, or a PC audio outlet by placing the jumpers as shown in Table 3. ”Audio filter settings” below. The filter components mounted should be appropriate for most headset loudspeakers.

	CJ2	CJ3	W1	W2
Connecting to	Connect to headset	Connect to headset	Mount jumpers 4	Mount jumper 2.
headset	microphone.	loudspeaker	and 5
Connecting to PC	Connect to PC micro-	Connect to PC loud-	Mount jumpers 1,	Mount jumper 1.
	phone input	speaker output	2 and 3

Table 3. Audio filter settings

3.2.3Antenna

The RF output of the radio module is matched to approximately 50 ohm. An antenna must be connected to the SMA connector to set up an RF link.

3.2.4Power supply

The application board is fitted with two coin-cell battery holders, connected in series, for use with ZinkAir (type 675) batteries. The board also contains a footprint for a CR2 Li battery holder (1/2 AA, Bulgin BX0031). Alternatively, an external power supply can be connected to P3. You select battery or external voltage with SW6.

The voltage supply to the RF module should be between 1.9 and 3.6 V. If the onboard 2.5 V linear regula- tor is used, the input voltage should be between 3 and 15 V. The linear regulator can be switched on or bypassed with SW7 and SW8 (both switches should have the same position).

Note: Do not exceed 3.6 V when using external voltage unless the linear regulator is used, as this can damage the radio module.

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