Features :
l Dual DC power supply
±12V 1A and ±5V 1A with Short circuit protection and indicators
l 8-ch. Logic switch with indicators
l 16-ch. Logic monitor
l 2-Debounce switch
l 3-State TTL Logic probe
Indicate Hi-Low Logic and Pulse
l Function generator
1Hz to 100kHz frequency output.
Button Selection with Frequency range indicators.
3 Waveform selection :
Sine, Square and Triangle
Complete with a TTL output
l Binary to Hexadecimal decoder
to four 7-segment LEDs
l 8-Bit Analog to Digital Converter
Maximum input voltage +5V
l Adjustable 0-5V Voltage reference source
for Analog to Digital Conversion experiment
l 8-Bit Digital to Analog Converter
Output of 0 to +5V R-2R ladder type
l Breadboard
Measuring 5” x 7”
Point contact 1,600 points
l 7-segment LED in Common Anode and Cathode
2 digits with limit-current resistor each
l 250mW Audio Amplifier
with 250mW 8W Speaker
l 8-ch. High-Current Driver
+12V 500mA Load driver
Supplied with Screw terminal block
Includes :
Experimentboard, AWG#22Wires, Instruction leaflet, Labbook, SimpleDigital ICs formultiple experiments.
2 NX-4i Digital Circuit Experiment Board
1. How to use the power supply
On the NX-4i board has 4 DC supply : +12V, -12V, +5V and-5V reuglated. The
connecting of DCsupply can do directly and DCvoltage has the common ground.
All output has short circuit protection that cut-off the terminal suddenly if short output
is occured. The warning sound will be lound and indicator turned-on to report
experimenters.
2. How to use the Function Generator
2.1 Waveform Selection
Press WAVEFORM button and see the Waveform indicator. Press until
indicator target on. For example, if would like to select SINE, press WAVEFORM
button until SINE’s indicator on. In Squarewave and Triangle waveform selection
are same method.
2.2 Frequency Selection
2.2.1 Target frequency is 500Hz. Press RANGE button until x100 Range’s
indicator on.
2.2.2 Connect output of Function Generator to Oscilloscape. Adjust
AMPLITUDE knob to center. See the output waveform at Scope’s display
2.2.3 Adjust FREQUENCY knob until the waveform’s frequency is the
target value.
2.3 Amplitude Adjustment
Turn AMPLITUDE knob until thewaveform’samplitude level is target value.
How to use the tools on
NX-4i Digital Circuit Experiment Board
NX-4i Digital Circuit Experiment Board 3
3. How to use the Amplifier
3.1 Connect the Output of Amplifier and Ground to SPEAKER input
terminal near the Amplifier.
3.2 Apply the input signal to Amplifier input.
3.3 Turn VOLUME knob to the target level.
Warning
3.4Must connect Amplifier’s output to Speaker input before apply the
input signal.
3.5 When finished, must disconnect or remove all circuit wires from
The Amplifier and Spaeker input.
4. How to use the logic switch
To select logic “1” -press logic switch until LED-red show status logic “1”.
It supply +5V at output point, that means logic “1”
To select logic “0”-press logic switch until LED-green show the logic status
“0”. Output voltage is about 0.8V, it equal logic “0”
5. How to use the logic monitor
This tool is shown the logic status.On this board has 8 channelswhich enough
for all digital circuit experiments.
At default, the all input are pulled down to ground. The LED output off that
mean logic “0” occur.
To test the logic level in the circuit, connect the input point to a test point on
the circuit. Observe the result at the LED monitor.
Light ON mean the point under test has logic status”1"
Light OFF mean the point under test has logic status”0"
Attention: The logic monitor can use with every digital circuit, which use
supply voltage +5V or TTL level.
4 NX-4i Digital Circuit Experiment Board
6. How to use the TTL logic probe
6.1 Connect input “IN” to the examined point
6.2 If the green light at “LO” turn-on, the examined point will be logic level “0”
6.3 If the red light at “HI” turn-on, the logic level equal”1"
6.4 If the yellow light at “PULSE” blink, in the same time light at LO and HI blink
together. It shows the changing of unstable logic level or it occurs pulse at this point.
7. How to use the debounce switch
It’s used for supplying the single perfect square-wave pulse for the digital
circuit. There is 2 outputs; following,
7.1 Rising edge pulse output - if the switch is not pressed, the logic level
will be “0”. If press the switch, it will be “1” up to press it.
7.2 Falling edge pulse output - if the switch is not pressed, the logic
level will be “1”. If press the switch, it will be’0" up to press it.
It is noticed that, logic switch, logic monitor and debounce switch can work
suddenly, do not use/connect the ground line.
8. How to use the LED 7 segment decoder
(Binary to hexadecimal decoder and display)
This tool’s function is decoding binary data to hexadecimal data and drive
to LED 7 segment for displaying. On this board has 4 units.
At default, the display show “0” because all inputs is pulled-down to ground.
It causes the all inputs receive “0” data.
To use, fed da