Hello everyone
I need some hints or advices with my project......
The lecture gave me an electronic project but i don't have much knowledge in electronics so i'm really need some help or advices.

the project is to desing a delay module will produce a positive going pulse having an on-time of 50 msec duration and an off-time of a duration that can be switched between 16 secs, 8 secs, 4 secs and 2 secs.

the duration is to be selected by a momentary push button. One push press will give a 16 sec delay, two presses will give an 8 sec delay and so on.

the ouput will be a enhancement mode MOSFET - a MTP3055E device.

and i'm only allowed to use the following ICs

4011 - Quad 2 input NAND gate
4017 - 5 stage johnson counter with decoded active high outputs
4020 - 14 stage binary counter
4093 - Quad 2 input Schmitt trigger.

after reading the datasheets, and i think i can to use the 4020 for the delay, 4093 for the positive pulse, but whats the difference between 4011 and 4093, and what does 4017 do?

Thanks in advance for any hints or advices......

 

Do you have data sheets for each of the IC's? A CD4017 is a decade counter with decoded outputs. Handy for selecting things like Nixie tube cathodes.

You need to look into the difference between normal logic inputs and Schmitt inputs.

 

after reading the datasheets and google around...
4011 is to give clock pulse
4020 can be use to set the delay 16sec, 8 sec 4 sec 2 sec
4093 use for controlling the output
but still don't know what does 4017 are used for in this project...

please correct me if i get anything wrong

 

Have a closer look at the 4093's datasheet.

4011 and 4093's are similar.

However, the 4093 has Schmitt-trigger inputs. This makes them much more suitable for things like oscillators or gated oscillators than non-Schmitt-trigger input components.

Go to National Semiconductor's site, and download their datasheet for the CD4093B.
Same thing at TI.com 's website.
Then go to ONsemi.com and download their MC14093B datasheet.

Downloading datasheets from multiple vendors will usually yield a good deal of application hints.

 

after reading and reading and research.... brain exploding
i can use 4093 to make a 2 secs pulse which feed into the 4017 on output 1, 2, 4 and 8 to give me the 16secs, 8 secs, 4 secs, 2 secs delay
still not quite sure how to use the 4020 14 stage binary counter

 

hey bro did u get urs working? I'm doing the same project and i have no idea how to even start this.

 

If you don't need it to do the function, don't use it. That's like the saying we had: 'A good technician always has parts left over'.

 

after few weeks of hard work.........
this is the circuit i have come up with
but can anyone check if my nand gate monostable is right? coz i don't get any output

thx very much