Hello,
after some time reading here, I have finally made a laser driver based on the LM317. I followed tutorial by rog8811: Laser driver - It can be done. It works very well, but I would like to replace the on/off switch by a transistor, so I can send a signal for turning on/off.
My question is: Which option is better, NPN or PNP? I was thinking on the TIP120-TIP127 family. But I'm not sure if a NPN switching the returning ground is a good solution or if a PNP switching the voltage IN is better.
So, what is you opinion?
Thanks a lot in advance.
after some time reading here, I have finally made a laser driver based on the LM317. I followed tutorial by rog8811: Laser driver - It can be done. It works very well, but I would like to replace the on/off switch by a transistor, so I can send a signal for turning on/off.
My question is: Which option is better, NPN or PNP? I was thinking on the TIP120-TIP127 family. But I'm not sure if a NPN switching the returning ground is a good solution or if a PNP switching the voltage IN is better.
So, what is you opinion?
Thanks a lot in advance.