2 bit down counter - Electronic Circuits Projects Diagrams Free

hamm · 20th June 2009, 05:56 PM

i have design a two bit down counter it works well in simulation but when i patch it on breadboard it doesnt count can any one figure it out whats wrong i have attached the circuit in doc file pls see it

fernando_g · 20th June 2009, 06:27 PM

On CMOS circuits you can't leave any inputs floating. Tie them to either Vdd or Gnd.

dougy83 · 21st June 2009, 12:14 AM

Did you connect power & ground to the flip flops & the decoder ICs?

hamm · 21st June 2009, 11:53 AM

thx for reply
yep i observed on simulation when i connect the above circuit to 9v battery once i connect the 7 segment(common cathode) to -ve terminal it becomes short on the other hand when i give a separate ground to seven segment it start counting wts the reason ov it wt should i do on bread board

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20th June 2009, 06:27 PM	#2
fernando_g	On CMOS circuits you can't leave any inputs floating. Tie them to either Vdd or Gnd. __________________ Natural laws have no pity.' -Robert Heinlein

21st June 2009, 12:14 AM	#3
dougy83	Did you connect power & ground to the flip flops & the decoder ICs?

21st June 2009, 11:53 AM	#4
hamm	thx for reply yep i observed on simulation when i connect the above circuit to 9v battery once i connect the 7 segment(common cathode) to -ve terminal it becomes short on the other hand when i give a separate ground to seven segment it start counting wts the reason ov it wt should i do on bread board Last edited by hamm; 21st June 2009 at 11:54 AM.