Binary Count down timer - Electronic Circuits Projects Diagrams Free

hugehead · 28th February 2005, 08:17 PM

HI

I am looking to create - using D-Type flip flops- a count down timer.
It is required to count from 50 to zero as each input of a pulse, and able to be shown on 7 segment displays. I have found a circuit that counts form 16 to zero, but cld not work out how to reset to 10. or infact 50 as i need.

many regards

hugehead

Someone Electro · 28th February 2005, 08:40 PM

why dont you post the circuit?

guzzimac · 1st March 2005, 09:57 PM

Using D_types would require a lot of logic. Why not investigate CMOS 4000 series presettable up/down counters? These can be cascaded and loaded with any number you like. Binary output to a suitable 7 segment driver and there you are.

nos_slived · 8th March 2005, 01:49 AM

I suggest two 4017 counter chips, controling two seperate 4511 chips, which inturn lights up the 7 seg LEDs. I wish I had a schematic for you, but this is a new comp, and I don't have any of my software loaded yet. If you have any questions, ask author Dave Cutcher(Evil_Genius).

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28th February 2005, 08:17 PM	(permalink)
hugehead	Binary Count down timer HI I am looking to create - using D-Type flip flops- a count down timer. It is required to count from 50 to zero as each input of a pulse, and able to be shown on 7 segment displays. I have found a circuit that counts form 16 to zero, but cld not work out how to reset to 10. or infact 50 as i need. many regards hugehead

28th February 2005, 08:40 PM	(permalink)
Someone Electro	why dont you post the circuit? __________________ Il give you shocking experience.

1st March 2005, 09:57 PM	(permalink)
guzzimac	Using D_types would require a lot of logic. Why not investigate CMOS 4000 series presettable up/down counters? These can be cascaded and loaded with any number you like. Binary output to a suitable 7 segment driver and there you are.

8th March 2005, 01:49 AM	(permalink)
nos_slived	I agree I suggest two 4017 counter chips, controling two seperate 4511 chips, which inturn lights up the 7 seg LEDs. I wish I had a schematic for you, but this is a new comp, and I don't have any of my software loaded yet. If you have any questions, ask author Dave Cutcher(Evil_Genius). __________________ http://www.danasoft.com/sig/slived.jpg http://serve.dynasig.net/818.gif