| Electronics > Projects, Designs, and Technical Stuff |
| Laser alarm project |
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| fixit7:
I am working on this. I have the laser. "https://blog.prayogindia.in/make-laser-light-security-alarm/" I emailed the author but have no heard back. "https://www.dropbox.com/s/cy7sy1itwzqcg7t/circuit_of_laser_security_alarm-engineeringprayog.com_-768x432.png?dl=0" Is the 2n7000 the BC547 transistor? And there is a 6.8K resistor that is not in his parts list? Thanks for your help. |
| ajb:
A 2N7000 is an N-channel MOSFET, a BC547 is an NPN bipolar transistor; they are not the same thing at all. The information on that page is very confused; the schematic shows an NPN transistor but with MOSFET labeling (G,D,S instead of B,C,E). Either one could be used in this circuit, but the value of the 6k8 resistor will need to be adapted depending on the resistance of the LDR. |
| fixit7:
I agree that the page is confusing. Would you be able to help me with the detector circuit? |
| fixit7:
I found this. https://makezine.com/projects/laser-tripwire-alarm/ Does this look like it may work? It has fewer parts than the other project. |
| fixit7:
Could use some help here? Thanks. |
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