Construction Clues and Testing
The circuit shown here involves standard components, so assembling them won’t require any special attention. Just fix them over a general purpose PCB and do the necessary connections by soldering as per the circuit schematic. After completing, switch it ON and confirm all the assigned safety output parameters using a digital multimeter.
Once you complete the assembly and testing the power supply circuit, it’s time to integrate it to supply wires of the modded laser unit.
Finally we proceed to the testing of the modified green laser pointer through the configured external power supply circuit.
Do it with the following steps:
Using the original batteries and connecting a milliammeter in series, power up the laser circuit and measure this safe operating value of the current. Note it down.
Remove the batteries and reconnect the laser circuit to the assembled power supply circuit and connect the meter in series with the positive of the supply line.
Do not switch ON the power as yet. Make SURE P1 is kept at its maximum value.
Now switch ON the power. Wait until LED1 lights up fully.
At this point the laser will remain shut-off.
Slowly adjust P1, monitoring the current level over meter and the shine over the diode laser.
Optimize the current level so that it matches exactly to the earlier recorded one.
The laser should also provide maximum glow at this point.
Fix P1 using cyanoacrylate bond to seal its mechanism.
This completes the setting up and testing of the entire circuit of this modified green laser pointer. The power supply circuit may be tried with high power diode lasers and should work equally well.
Remember laser beams can be hazardous if proper safety measures are not observed. Please read this information before you start working with these devices.
Image Courtesy: http://www.greenlazer.com/