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  • Thanks -Each of the three mentioned laser diodes is a package( photo and lase diode together).- I measure the current using Ameter across red wire- The schematic you have drawn is right,it is perfect._ I said I used to change the series value with photo Diode and it works great that was with the SANYOO LD which is not available any more, The available one now is 9 GAIA with the very low monitoring current and I tried to change the value of this resistor using potentiometer instead of it, starting from 200 K ohm till 2 K Ohm it does not make any difference in the laser power or the voltage on the yellow pin which is fixed on 2.45 V.- I tried also to change value of R17 from 20 K to 200 K, and still nothing change.Thanks for your help and for the clear schematic and best regards .

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  • The voltage is already 2.3 v but it is between the red and the brown( the tow terminals of LD ) , between red and black it is 5 v, between yellow and black it is 2.5v, I think(but not sure) the critical item is the monitoring current it is very far from the first and second models Im but I don,t exactly know how to control it because I do not understand if the monitoring current is the current given by driver circuit to photo diode , or current given by photo diode to be sensed by the driver circuitthanks.

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  • Thanks for the precious information, in my country it is not easy to get laser diodes so I do not have the ability to choose from the wide range of laser diodes, I can get only what is already available I am taking about 5mW laser diode used in a a flashlight assembly which is a part of an equipment(which has no spare parts available ) which contains a main P.C.B a small part of it is the LD driver, some of the original laser diodes worked for more than 10 years, but some of them became very weak does not give enough power to cover the working range diameter, I used to replace them with SANYOO diode , that was O.Kbut the available LD for me now is 9GAIA there is nothing to worry about from point of view of IR and Red diode replacement because the detectors and receivers of the system c...

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    Thanks for the precious information, in my country it is not easy to get laser diodes so I do not have the ability to choose from the wide range of laser diodes, I can get only what is already available I am taking about 5mW laser diode used in a a flashlight assembly which is a part of an equipment(which has no spare parts available ) which contains a main P.C.B a small part of it is the LD driver, some of the original laser diodes worked for more than 10 years, but some of them became very weak does not give enough power to cover the working range diameter, I used to replace them with SANYOO diode , that was O.Kbut the available LD for me now is 9GAIA there is nothing to worry about from point of view of IR and Red diode replacement because the detectors and receivers of the system can work with both types of laserI need any ideas to adjust the values of the components of the driver circuit to be able to drive the available LD or I have to to get rid of any unit that has a laser diode problem which is very very expensive choiceThanks again and best regards

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