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# How to make a 1 Hz clock circuit?

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#### budhy

Re: Clock circuit

Please take a look at this circuit:

#### IanP

Re: Clock circuit

One option to generate 1Hz, or 1s clock, is to use 555 timer ..

If C=10µF and RA=RB=R here is the formula to calculate R:

T=0.693(RA+2RB)*C=2.079*R*C

R≈48.1kΩ, so use RA=RB=47kΩ and add 2-5kΩ trimmer to RA or RB to set 1s ..

Regards,
IanP

#### gie_b_hsb

##### Junior Member level 2
Re: Clock circuit

thank's for all, as soon as i try this schematic....?

sorry.... any have voltage regulator with CT transformer circuit......?i say again many thank's for your help.....?

Gie

#### hazemafify

Re: Clock circuit

oh! it's easy circuit you can search in google by keyword "ic 555" you will get the schematic of the 555 timer and the equation that you can get the values of resistors and capacitors or you can search about the toturial and simple program that calculate the valuse of R's and C's .
and another way but it's not efficient that buy crystal

#### manish12

Re: Clock circuit

you can use blink led also.
you can also use the supply freq for ref. with counter.

#### atferrari

##### Full Member level 4
Clock circuit

Look for a discarded quarts clock. Most of the times their oscillator circuits are intact.
With a scope, even a with a multimeter, you could identify the point where there is a 1 Hz pulse.

#### gie_b_hsb

##### Junior Member level 2
Re: Clock circuit

thank's for all.
i think, i need any clock generator for my counter circuit which the IC i used are 6 HCC40110B from ST electronic with six 7 segment, so that the result are x.xx.xxx,the last three digits equal 1/1000 second. how to find clock generator for this circuit.....?
once again i said thank's a lot for you any kind......

rgds,

gie

#### echo47

Clock circuit

Does x.xx.xxx mean 9 minutes 59 seconds 999 milliseconds? If that's true, then you probably need a 1 kHz clock, and you probably want it to be more accurate and stable than a 555 circuit.

You could buy a crystal oscillator that is a convenient multiple of 1 kHz, and then divide it down to 1 kHz. For example, buy a 2.048 MHz oscillator and an 11-bit binary divider. Or maybe a 1.000 MHz oscillator and a three-stage decade divider.

#### gie_b_hsb

##### Junior Member level 2
Re: Clock circuit

it's true 9.59.999, do you mind to give pulse generator circuit, i tried a simple 555 circuit but this circuit not running well. in this topic have circuit using 4060 & 4017, is it match with my circuit..?

rgds,

gie

#### budhy

Re: Clock circuit

CRYSTAL-CONTROLLEDTIME-BASE GENERATOR with 4060 & 4017 (27654.pdf) generate 1 Khz clock, it is exacly what you need.

#### gie_b_hsb

##### Junior Member level 2
Re: Clock circuit

dear budhy and everybody to help me...

oke, i trying this circuit....

sorry budhy do you have personal email....?

thk's for all

rgds,

gie

#### gie_b_hsb

##### Junior Member level 2
Re: Clock circuit

Dear all,

How to change digits number 9.99.999 to 9.59.999....

Thks

rgds,

gie

#### bigaussie

##### Member level 2
Re: Clock circuit

buddy 555 is the best option available

#### daviddlc

##### Full Member level 5
Re: Clock circuit

I don't think the 555 is the best option for a clock, you need something more stable.

#### bharitta

##### Junior Member level 2
Re: Clock circuit_2

please everybody help me, i had build counter up/down using IC HCC40110B, and the circuit is running well, but if i push the stop button, the counter digit on 7-segment not stop fully, so that please help me to find this problem....

thanks...

regards,
Gie

#### randell_xtian

##### Full Member level 4
Re: Clock circuit

try the post circuit diagram by IanP it will work. you can used the principle behind the 555 monostable timer.