I'm building a laser driver for a dvd laser burner. I needs 200-250 mA and 1.8-2.2V.
Is it the right setup? Is the trimpot setup correct? The multimetre shows6.43V and the trimpot doesn't seem to change anything.
I'm building a laser driver for a dvd laser burner. I needs 200-250 mA and 1.8-2.2V.
Is it the right setup? Is the trimpot setup correct? The multimetre shows6.43V and the trimpot doesn't seem to change anything.
Hi Dylan, Here is the recommended variable LM317 circuit schematic from the Data Sheet.
It is usually a good idea to include the C1 cap even if you are working off a battery as this will help to stabilize the circuit. Also watch the polarity of the electrolytic caps as I noticed that the one in your drawing was reverse polarity. Good luck on your project.
John
NOTE: Pins 2 and 3 in the above schematic are reversed from normal convention. See my last post and link to ON Data Sheet.
Hi Dylan, Here is the recommended variable LM317 circuit schematic from the Data Sheet.
It is usually a good idea to include the C1 cap even if you are working off a battery as this will help to stabilize the circuit. Also watch the polarity of the electrolytic caps as I noticed that the one in your drawing was reverse polarity. Good luck on your project.
John
NOTE: Pins 2 and 3 in the above schematic are reversed from normal convention. See my last post and link to ON Data Sheet.
