Assembly Check out:
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It is highly recommended to inspect the PCB carefully.
•
Check for proper placement of components.
•
Check that capacitor C1, IC1, & both LEDs are installed in the correct direction.
•
Check that all connections are soldered with a shiny appearance.
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Redo any solder connection that is dull looking or in a ball.
•
Check that there are no solder bridges touching adjacent connections together.
Solder
Profiles:
Operation:
Connect the 9 Volt battery to the battery clip.
With a small flat screwdriver adjust the potentiometer until you can see both LED
lights flash alternatively.
You can vary both LED’s alternately flashing rate or have just one LED constantly on.
Troubleshooting:
•
Turn the potentiometer w/ a small screwdriver to see both LED flash alternately.
•
If one of the LEDs do not light up then probably its polarity was reversed.
•
Unsolder the LED and solder it the other way around.
•
Verify that the 555 timer IC was installed with its notch facing down as per the
PCB Board Layout.
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Verify if that the resistors values are correctly placed.
•
The R1 and R2 resistors should be 10k.
•
Verify that C1 capacitor polarity is correct.
•
Replace the 9V battery if the circuit has been functioning and then stops.
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