USB-AD12f
Page 5
4.2
Interfacing examples for digital outputs
Serial resistors in the output lines limit the current and protect the hardware from being destroyed.
4.2.1
Connecting an LED
Only so-called low-current LEDs can be
used, because they already work with 1mA
current.
Please also observe the total current listed
in the technical data (see chapter 7).
4.2.2
Connecting a relay
A connected relay is ideal to switch higher
currents. Since the field coil of the relay
requires a higher current than provided by
the measurement system at one line, a
transistor is connected ahead.
Relay boards with 8 relays or 16
semiconductor relays are available at
bmcm.
4.2.3
Connecting a lamp
A transistor can be used to switch higher
loads. The selected transistor must comply
with the maximum switchable current.
The figure on the right shows an
application with a maximum current of
100mA.
NORM ELECTRONICS Ltd
www.norm.gr
Tel. 210 3234988
