Negative Adjustable Power supply with 7905


Negative Adjustable with 7905

Often we have to adjust the tension of a negative supply and do not have the ideal component hand, this circuit in addition to solving this problem, serves up a Power Adjustable Negative. He use the regulator 9v negative, 7905, the envés to use with fixed voltage, we can use it as a variable regulator. The 7905 in this configuration can adjust the output from -5 to-30V with an input of up to-35V. See table below.

Example: Vin = -20 V

RadjVout
33-5,74
100-6,99
330-11,03
680-18,20

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