DB14
Scientech Technologies Pvt. Ltd. 9
Procedure :
• Connect +5V and ground to their indicated position on DB15 experiment board
from external DC Power Supply or from DC power block of Digital Lab
ST2611.
• Connect BCD inputs to pins A0, A1, A2 A3 of IC 74LS47 as shown in logic
diagram as per truth table from 8 bits data switches of ST2611 or from external
source.
• Connect +5V to pin no. 3, 4, 5. of IC 74LS47
1. Switch on the Power Supply.
2. Observe decimal output on common anode display given on the experiment
board. Outputs of individual pins can be seen on logic probe or on LED display
of Digital Lab ST2611 or on multi-meter.
3. Connect different combination of inputs as shown in truth table and prove truth
table.
4. Connect logic 0 to BI/RBO input, logic 1 to RBI and LT input.
5. Repeat step 5, 6 and observe the results.
6. Connect logic 0 to LT input, logic 1 to RBI and BI/RBO input.
7. Repeat step 5, 6 and observe the results.
8. Connect logic 0 to RBI input & BCD inputs, logic 1 to LT & BI/RBO input and
observe the results.
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