Need a circuit, marked the size of the components, it is best to have a detailed calculation process. The circuit diagram can be viewed under MULTISIM
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In this figure the adjustable R2 ground terminal access 1.25V negative voltage on the line friends. The The The The The The Other filter capacitor, then appropriate to adjust it
LM317 voltage output range is 1.25V ~ 37V, 1.25V below can not guarantee. Circuit diagram is as follows, the voltage calculation formula Iadj is very small (50μA) can be ignored, the potentiometer resistance selection 4.7kΩ can meet the output voltage 1.25V ~ 24V adjustment range.
Use LM317 to do 0-24V adjustable DC power supply, more difficult to do a 1.25V-24V adjustable DC power supply, the circuit is very simple.
This is because the LM317 adjustable three-terminal regulator, the minimum output voltage of 1.25V, if the required power supply from 0V from the tone, the regulator circuit need to add a negative voltage, power input on the need for positive and negative Three input, the relative circuit is more complex, the general power supply is no need to switch from 0V, so there is no need to join the negative power supply.
LM317 output using 1.25V-24V circuit is very simple, direct soldering can be used, the two diodes in the figure to protect the three-terminal regulator with, can not increase.
