Hey everyone, I´am new to the forums and this is my first post.
Just for information, I´am 16 years old and i´am from Germany.
Some time ago, i became interested in lasers, and i started lurking around in this forum,
and in a german one. However, i did not dare to ask my questions in the german one,
because every second one, who is new to lasers, and who is asking a question there gets killed by postings regarding safety.
(I care much about Safety)
I read about the 16x dvd burner diodes, and thought that that would be an easy way to obtain a great, strong red laser.
I purchased some burners, and some lm317 for the driver.
After i got alle the components that i needed, (I´am new to electronics, so that was like everything :-D(Breadboard,resistors,...))
I wired it up on a breadboard. To test the circuit, i chose to try an led. scince i had it lying around, i took a 100 ohm resistor to test.
That should leave me with 12,5 mA, right?(1,25/100) I power the circuit with a 9V battery. So i wondered why the led was at full brightness and tried a 5k resistor. Again, full brightness. I left the resistor away, and again. Then i thought ADJ and Vout should have 1.25V difference. 0,0V says my DMM. I have no idea what could be wrong, and thus i´am asking you to look at my circuit if there is something obviously wrong.Thats what i think. But i don´t see it :-D
I hope someone here sees my mistake
Thanks in advance, ArRaY
Just for information, I´am 16 years old and i´am from Germany.
Some time ago, i became interested in lasers, and i started lurking around in this forum,
and in a german one. However, i did not dare to ask my questions in the german one,
because every second one, who is new to lasers, and who is asking a question there gets killed by postings regarding safety.
(I care much about Safety)
I read about the 16x dvd burner diodes, and thought that that would be an easy way to obtain a great, strong red laser.
I purchased some burners, and some lm317 for the driver.
After i got alle the components that i needed, (I´am new to electronics, so that was like everything :-D(Breadboard,resistors,...))
I wired it up on a breadboard. To test the circuit, i chose to try an led. scince i had it lying around, i took a 100 ohm resistor to test.
That should leave me with 12,5 mA, right?(1,25/100) I power the circuit with a 9V battery. So i wondered why the led was at full brightness and tried a 5k resistor. Again, full brightness. I left the resistor away, and again. Then i thought ADJ and Vout should have 1.25V difference. 0,0V says my DMM. I have no idea what could be wrong, and thus i´am asking you to look at my circuit if there is something obviously wrong.Thats what i think. But i don´t see it :-D
I hope someone here sees my mistake
Thanks in advance, ArRaY