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Old 09-15-2021, 01:52 AM   #1
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Default Power output does not match

LM7809 and LM7909 are used as positive and negative 9V power supplies, but no matter how they are used, the output is about 9.5V plus or minus. Why? How to do it? I used multisim11 to simulate. I also add capacitors for the input and output. I measured it with the multimeter inside. There is indeed a voltage difference greater than 3V, but it is still 9.5V. What is going on? How can 7809 and 7909 be biased to generate 9V?
Thanks in advance.
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