Hi. I have a few options how to create a pulse divider that must have selectable divider between 1 and 4000. However, all of those require programming. This is not an issue but I was thinking if this is possible to do using discrete components. I have been iterating something that is based on a counter and 12 bit AND, but at the same time thinking if the wheel is already invented. Meaning that a standard solution exists.

A

 

What I think you need is 12-bit binary down counter with a synchronous preload. Each time the counter gets to zero, or to an illegal state, the pre-load value gets jammed into the counter. When the counter reaches 0, the terminal count output toggles a flip-flop and reloads the counter.

 

Not exactually certain of what you want, but rate multipliers might be an option.

 

must have selectable divider between 1 and 4000

How is the divider count to be selected?

 

Papabravo
Yes, this is pretty much what I am looking for

dl324
4089 is what I have found the best option so far. In the end the circuit might be as simple as cascading three 4089s and flip-flop

crutschow
Can be as simple as DIP switches

thanks,

A

 

This is made for the job
https://assets.nexperia.com/documents/data-sheet/74HC40103.pdf
and you can cascade them if you need more than 8 bits.

 

The questions are What frequency? and are you looking for a square wave out or just a pulse out every so many input pulses? ANS what is the input signal?
Additionally it will be useful to know the means desired for selecting the division, will it be software, electronic input, or setting dip switches? The simplest scheme uses 5 ICs and a 10 position dip switch for each digit of the divisor. It has a direct decimal input and can divide by 1 to 9999.
When the count equals the setting the output of the four input AND gate goes high and pulse is generated and the counters are reset.

 

If the division ratio is a binary number, either from a 12-way DIL switch or a 12-bit parallel port, the the 40103 gives a 2-chip solution.

 

Hello and thanks. 40103 is exactly what I assumed that must exist but did not find.

 

Hello and thanks. 40103 is exactly what I assumed that must exist but did not find.

There’s some handy devices hidden away in those 401xx numbers!
There’s also a 74HC version.

 

Did you know that if you change the state of P0 every output pulse, you can make it divide by n+½ ?

 

There’s some handy devices hidden away in those 401xx numbers!
There’s also a 74HC version.

Indeed!