1Hz clock pulse generator

[Shyamal]

I need 1Hz clock pulse generator circuit diagram using 555ic. i also make it , but face some problem of its frequency. frequency change after the fixed time.
for this reason, i need help anyone.....
do u give me any circuit diagram?

 

[crutschow]

So how accurate do you need the 1Hz to be? 555s depend upon the R and C values for the timing and are thus not particularly accurate. For good accuracy comparable to a watch, you would need a crystal oscillator.

 

[Shyamal]

Hobby in Electronics

 

[MrAl]

Check out "60Hz pulse generator".

 

[ronv]

Here is a link to a xtal oscillator if you need really good precision. Otherwise you might consider using NPO or COG capacitors to improve the drift.
https://www.electro-tech-online.com/custompdfs/2011/01/circuit-2.pdf

 

[blueroomelectronics]

Hobby in Electronics

Huh? What does that have to do with your 1Hz clock generator?

 

[ericgibbs]

Huh? What does that have to do with your 1Hz clock generator?

Hi Bill,
I think he is pushing his web page.

 

[atferrari]

Discarded alarm clock

If you could do without the 555, a discarded alarm clock could provide a reliable 1-Hz signal.

 

[blueroomelectronics]

Most clocks use the mains frequency as a timebase.

 

[KMoffett]

Most clocks use the mains frequency as a timebase.

Few of the clocks in my home or work place use the line power. All but two out of around twenty are battery powered.
Well...maybe a few more if you count the oven, microwave, radios, misc. entertainment devices...

Ken

 

[blueroomelectronics]

DIY clocks tend to be LED clocks which means AC driven.

 

[Boncuk]

Here's a 1Hz time base.

Adjust it to exactly Hz output with the trim cap.

Boncuk

 

[heyadrian]

wouldnt 1HZ be easier to kick out with a flip-flop? Alor more accurate dependant on voltage ad current input.

 

[crutschow]

wouldnt 1HZ be easier to kick out with a flip-flop? Alor more accurate dependant on voltage ad current input.

Flip-flops don't oscillate or "kick out" a frequency. They can divide a frequency at their input or state a logic state.

 

[mvs sarma]

unfortunately not in India as our power generation, though grid sync'ed, is not locked to any standard . it is around 47 to 49Hz and clocks configured for 50Hz run slow. we have to have 50 Hz time base, or 1Hz pulse.
there are simpler ways to get it
32.768KHz crystal and two CMOS chips CD40xx give the concerned clock. perhaps we can use a pic and write a small .asm file to output 50Hz and out of phase signals so that the mains wall clocks can be fed these clocks. i once made using 12F510 and 4MHz crystal.

 

[KMoffett]

Can't see why you don't just gut a battery wall/desk clock module. Dirt cheap and accurate enough that I have only reset them for daylight saving times shifts and when the battery runs down. And we have a lot of them.

 

[Shyamal]

Well..............................

 

[KMoffett]

Well..............................?

Ken

 

[blueroomelectronics]

Well...
**broken link removed**

 

[canadaelk]

Bill: You funny old meany! Is that you at the right slinkering away? E