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| Adjust negative power supply by 7905 |
7905 is a negative regulator.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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