Electronic circuits that use the 555 Timer

555 Timer Circuits

555 Timers are fun and a great way to start learning electronics

REPLACING A 556 WITH TWO 555's

Here is a handy reference to replace a 556 dual timer with two 555's:



The table shows the pin numbering for each timer:
 
  555 556 - Timer 1 556 - Timer 2
Ground (�) 1 7

7

Trigger 2 6 8
Output 3 5 9
Reset 4 4 10
Control 5 3 11
Threshold 6 2 12
Discharge 7 1 13
 Vcc (+) 8 14 14

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