![]() Metal film resistors are good choice for their 1% tolerance. So R has to be precise enough and it should be capable of dissipating the generated heat. Where I is the amount of constant current and R is series resistor. The value of R sets the amount of constant current, use the formula below. But that will add another voltage drop of around 0.7 V to 1 V, so I excluded it. LM317 is said to be sensitive to reverse polarity, most designs uses a protection diode before the input. ![]() It's really simple, you can build the circuit on a bread board or just by soldering components to each other. Only three components, excluding the power source and connecting wires. LM317 constant current source circuit diagramįirst, have a look at the circuit diagram, it's pretty basic. LM317 constant current source circuit diagram.
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