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MEMO BOARD - FLASHING LIGHT CIRCUIT

 

V. Ryan 2014

 

 

Below is the circuit diagram of the flashing LED circuit, used in the memo board project. It does not look like the real manufactured circuit, but it is the same circuit although drawn so that all the connections can be seen.
 
HOW THE CIRCUIT WORKS
 
The slide switch is ‘switched’ on, allowing electricity to flow through the entire circuit. It first flows through the flashing LED. The flashing LED has two states, ON or OFF and it automatically alternates between the two.
When the flashing LED is ON, it lights and it also allows electricity to flow through to the other LEDs and they light as well. When the flashing LED is OFF, electricity cannot flow through it and all the LEDs do not light. Tis is why the LEDs flash ON and OFF.
 
 
 
CLICK HERE FOR ANIMATION OF CIRCUIT
 
flashing LED circuit
 
 
 
LEDs only need a small amount of voltage / current to light. If one LED was connected to the 9 volt battery, it would be destroyed. One LED has very little resistance. The fact that four LEDs are connected in series together, means that the resistance in the circuit is increased and all four LEDs function normally.
 
flashing LED circuit
 
 
 
The real circuit
 
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