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Hi
I want to make a clock, from scratch, without an mcu. First i need to make
a
oscilator that gives me a 1 sec pulse (1 hz isnt it?)
How can i do it? with a 555? (and how?)
Jan
Hi
I want to make a clock, from scratch, without an mcu. First i need to make
a
oscilator that gives me a 1 sec pulse (1 hz isnt it?)
How can i do it? with a 555? (and how?)
Jan
period? A one-shot can be configured for a 1 second pulse, an oscillatorHi
I want to make a clock, from scratch, without an mcu. First i need to make
a
oscilator that gives me a 1 sec pulse (1 hz isnt it?)
How can i do it? with a 555? (and how?)
Jan
Do you want a 1 second pulse, or do you want a signal with a 1 second
Hi
I want to make a clock, from scratch, without an mcu. First i need to make
a
oscilator that gives me a 1 sec pulse (1 hz isnt it?)
How can i do it? with a 555? (and how?)
Jan
here in UK).If you need accuracy, I'd think about using a watch crystal, or even the
60Hz powerline (which is by some accounts kept accurate by an atomic
clock.)
Jan
Some years ago - about 1974 - I made a clock using the utility supply (50Hz
You can make a LED binary clock from scratch with about 7 ICs.Hi
I want to make a clock, from scratch, without an mcu. First i need to make a
oscilator that gives me a 1 sec pulse (1 hz isnt it?)
How can i do it? with a 555? (and how?)
Jan
That's nice, but 1Hz pulse is undefined as to the duty cycle. 1Hz is 1Hz wether1Hz is 500 msec. on and 500 msec. off. 1sec. on and 1 sec. off is 1/2 Hz.
Jay
happyhobit wrote:
1Hz is 500 msec. on and 500 msec. off. 1sec. on and 1 sec. off is 1/2
Hz.
Jay
That's nice, but 1Hz pulse is undefined as to the duty cycle. 1Hz is 1Hz
wether
it's a peak, a square, or whatever. You're gonna get mighty confused if
you
think the way you do. Nobody said anything about 1 sec on....
Might as well rip apart a $4.99 electromechanical clock/watch and use the motorJust as a side note, a 555 circuit, while simple to build, will be nearly
impossible to tune so it won't drift, particularly under different
temperature conditions.
If you need accuracy, I'd think about using a watch crystal, or even the
60Hz powerline (which is by some accounts kept accurate by an atomic clock.)
Watch crystals are very cheap, and using a 4049 to drive it is a
cheap/simple way to get an accurate timebase. You would have to divide it
down, though, so your part count will go up.
X-No-Archive: Yes
Robert Monsen wrote:
Just as a side note, a 555 circuit, while simple to build, will be
nearly
impossible to tune so it won't drift, particularly under different
temperature conditions.
If you need accuracy, I'd think about using a watch crystal, or even the
60Hz powerline (which is by some accounts kept accurate by an atomic
clock.)
Watch crystals are very cheap, and using a 4049 to drive it is a
cheap/simple way to get an accurate timebase. You would have to divide
it
down, though, so your part count will go up.
Might as well rip apart a $4.99 electromechanical clock/watch and use the
motor
drive pulse.
The thrill of putting the rest of project together. Just because someone'sWell, the easiest way is to buy an alarm clock for 5.99 at walgreens... but
where is the fun in that?