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Adjust negative power supply by 7905

7905 is a negative regulator.<cut>But we can use it as adjust negative power supply.The buttom circuit can adjust output from -5 to -30V when input is -5.5 to 35V.

Example :Vin = -20 V

Radj Vout
33 -5.74
100 -6.99
330 -11.03
680 -18.20

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