| This is Universal digital counter circuit using CD4510 & CD4543, that as a cheap due to basic components you can buy in many electronic shop. My friend said the some circuits that price same this circuit may be not worth it. You can apply too much model as you want with special feature of this circuit following.
1.A count up or count down the time.
2. Can connect output to a 7 segment LED both a Cathode common or Anode common.
3. Can store a collection of information
4. Can set number counting in advance.
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Best Regard,
Momename
http://www.eleccircuit.com/
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