Is possible to make a clock from a 555 timer?

• Is possible to make a clock from a 555 timer?
  Posted by LinkZ on 19 May, 2015 19:16
• I've found this site (http://www.engineersgarage.com/contribution/digital-clock-without-microcontroller) which claims that is possible to make a led clock from a 555 timer and few other parts.
  here is the schematics:
  
  url immagine
  Can this circuit work?
  If yes, in the description it says that few basic and/or gates are required. Which should I use?
• #1 Reply
  Posted by Zero999 on 19 May, 2015 19:21
• Not really. A clock made with an RC oscillator won't keep time and will drift all over the place.
  
  Use a 32768Hz crystal and a divide by 15 counter to get a 1 Hz time base.
• #2 Reply
  Posted by German_EE on 19 May, 2015 19:24
• The 555 just supplies one pulse a minute to drive the first counter. All of the chip information is there apart from the AND and the OR gates, so have a quick look in a 74HC series catalog and see if you can find them
  
  ANd yes, this will drift like crazy.
• #3 Reply
  Posted by smjcuk on 19 May, 2015 19:30
• Built something similar to that in 1991. No idea what happened to it to be honest. Probably nicked the bits for something else.
• #4 Reply
  Posted by Simon on 19 May, 2015 19:41
• Ypou can make a closk oscillator with unbuffered cmos gates and a 32.768 KHz crystal, I did this for a friend to make a 30 second ticker but used a microcontroller and fed the 32.768KHz in as an interrupt to keep time