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Laser alarm, simple circuit

A simple whale set from China, which is a laser alarm. The principle of operation is very simple, the laser beam is aimed at the photoresistor, this is the working state of the alarm, as soon as the beam is interrupted, the alarm is triggered and the speaker is turned on, which emits a certain sound signal.



This kit has a small set of parts and is assembled by hinged mounting on a connection block. If you want, you can make a printed circuit board yourself, for some reason the Chinese decided not to make it, probably because the circuit is very simple, but at the same time very interesting and necessary in the household.

The kit comes with the following set of parts:

  • Boxes for batteries - 2 pieces
  • Laser head with wires
  • Photoresistor in the housing
  • Transistor - 1 piece
  • Trimmer Resistor
  • Speaker
  • Connection block
  • Instructions in Chinese with pictures



Video for those who do not like to read:



Laser Alarm Assembly



Following the instructions presented, we collect all the details on the block.



First, insert the batteries into the box and connect the laser, the main thing is not to confuse the polarity, otherwise it can go out of standing, check it and proceed to assemble the receiver. There is no mount for the laser, but it is not necessary, since it should be free, so that it would be easy to install it in the place of protection.



We collect all the parts on the block according to the instructions, you don’t need to solder anything, since they are all fastened with bolts. We connect the box with pre-inserted batteries. A trimmer adjusts the volume of the emitted signal, which sounds loud enough.



The result was a very simple but interesting alarm.





That's all, I advise you to buy this kit, especially since it is not expensive!

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3 commentary
for those who do not like
no mounting is provided
free to be easy
very simple but interesting
box with pre-inserted batteries
Enough for you?
And the “working state” is when she “sings,” and what the author means is the waiting state.
Author
Maybe there are several grammatical errors in the text and a couple of spelling errors, point to the specific ones that you personally found. The post describes the assembly of the device. For those who do not want to read and believe that the text is about nothing with a bunch of errors, there is a video at the beginning of the article.
The author should have learned Russian. A post about nothing with a bunch of mistakes.

We advise you to read:

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