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the design below is the one from It can be done - Laser driver believe me i connected every thing like it is drawn in the picture

i would post a picture of the bream board but it looks hazy. anyway, i am 100 % sure it is connected correctly. it is nothing about the design

ok i setup the driver for my red laser diode. i don't want to burn my laser diode so i connected the driver circuit to the dummy load circuit as explained. the laser diode works on 2.6 volt and 35 ma.i measured at the diodes as explained and the only value i get is 0.87 v , it doesn't change...

ok thanks on your answer to question 2: after i measure the current in mA... what is this value, is this the value of the output current if i the load is replaced with the laser diode ?? and how do i convert this current to power, is there any equation for that ?

thanks a lot man for the advice. actually what i am trying to do is measure the beam width of the laser, using the same setup as the knife edge technique but only using an optical fiber to couple the laser beam. i have three questions 1- the laser diode works on 35mA and max of 50m A and...

i dont want to make a 5mw powerful . all i want is to get 3 different output power from the laser. so i can do the experiment 3 times with different power. i dont want to exceed 5mw , because after that i think i am gonna have to wear eye protection and i want to keep it as simple as possible

just a quick question plz regarding the equation above. my laser diode says that the operating current is 35mA and max 50mA. 1.25/50ma= 25 ohm, 1.25 /35ma= around 36 ohm does this mean that the max of the laser diode is when pot is at 20 ohms ( since there is a 5ohm fixed from the 2x 10 ohm )...

sorry man i know it sounds rude but can u link me some ?

well i have an optical power meter in the lab, i can measure it and make sure i don't reach the maximum right ? ok now for the values how do i set the max of the laser diode. i mean, some people make lasers more powerful than other, how do i make the max. 5mW

and the resistance = 1.25/ max current value right ?

thanks for helping man :D it is just i dont have much time and i have alot to do. if i build the same circuit, and change the value of the pot, will the output of the laser diode increase?

ok i have a 1x laser diode. i need a circuit for the laser diode to work and i can control the value of the output. so i want the max to be 5mW, because i will use it in a simple experiment ( measuring the beam width of the beam). also, i want to measure with 3 or 4 different output power, lets...

sorry meant 5mw can i just use one of the those simple Driver circuits and change the pot value, hence, the output power changes ?

thanks for all the useful information but i have a question. i have a red laser diode and i want to do an experiment at different output power. can i just use this circuit and change the pot to change the output power. NOTE: i want the laser max output < 5mw and change it in that range. NOTE...

hi, i have a red laser diode and i want to build a laser with a max of 5mw output but i want to control the output using a voltage/current supply. so basically what i am looking for is a simple reliable circuit that makes the laser diode works and i can control the output by changing the...