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HOW TO HAVE A DUAL VOLTAGE
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With 2 9V-batteries

With 2 x 9V-batteries

 

With 2 x 9V-batteries

          

 

With a circuit which uses a no-dual power supply to abtain a dual voltage (use 7905, 7909 or 7912 to obtain your desiderate voltage):

circuit wich uses a no-dual power supply to obtain a dual voltage

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