2-bit binary to decimal into7 segment

[dillip kumar badu]

hi ,
i m doing a project .it's like:-take two bits binary input by logic switch and display the value equivalent to binary input+2 as out put in seven segment .
but there is some condition
1.not allowed to use microcontrollers or programmable device
2. seven segment decoder ICs or logic gates ICs not allowed
3. ckt must able to work with 5/9/12 volt
could any one can give some ckt idea

 

[ericgibbs]

hi ,
i m doing a project .it's like:-take two bits binary input by logic switch and display the value equivalent to binary input+2 as out put in seven segment .
but there is some condition
1.not allowed to use microcontrollers or programmable device
2. seven segment decoder ICs or logic gates ICs not allowed
3. ckt must able to work with 5/9/12 volt
could any one can give some ckt idea

hi,
Sounds like a Homework question.?

Have you written out the Truth Table for the 2 bit Binary with '2' added.??
Please post it.

 

[xpi0t0s]

1.not allowed to use microcontrollers or programmable device
2. seven segment decoder ICs or logic gates ICs not allowed

OK, so what ARE you allowed to use? Presumably this will be limited to the components you've encountered so far on the course, but we have no way of knowing what those are. Are you allowed to use transistors? Thermionic valves? Diode logic? Are the switches SPST or SPDT?

Also have you got anywhere with the truth table yet? This will be the starting point, no matter what components you can use.

 

[mbarazeen]

so the 7 segment will display only 2,3,4,&5 when the switch changes from 00,01,10,11
so inputs- A,B
outputs- a,b...g ( 7 segments)

write the truth table and implement, still you can use only diode and transistors to do it,
find out some way using them to get 4 different outputs, only one will be high at a time when the switch changes.

then wire every output to lighten particular LEDs via diodes.
ex: when 00 is there one of the out put say P will be high, so it will power segments for number 2 (use 5 diodes)
same when 01 is there display "3" using 5 diodes
then 10 by 4 diodes
and 11 by 5 diodes