Cost of manufacture: 6
Note: The text is AUTO translated from
The infra red radiation is a region with bigger length of wave from the
visible spectrum. It is a region which our eye does not conceive, the
consequences however which we felt as heat of. The manufacture that to you
we propose receives this region and on one side us notice with optical clue,
otherwise we can observe the configuration of width of radiation.
The circuit of manufacture appears in
form. sensory is a passage of silicon with relatively big surface. This
passage when it is not litted up by infra red light has very big resistance
of order of Mohm.
this resistance is reversely proportional at approach of brightness. The
type of passage is not critical, in the place can enter anyone. The
resistance of passage him we use in order to polarize a transistor of npn
type BC547. The photodiode enters between in the collector and in the base.
The current that leak the passage is multiplied by the b of transistor and
it is presented in the emitter of transistor. This current is enough in
order to it leads and it turns on a Led ". En line with this circuit exists
a resistance in order to it limits his current.
The infra red radiation has very a lot of applications in the industry and
in the trade. The more important perhaps application they are telecontrols,
that exist everywhere. The proposed manufacture is based on a passage of
silicon which is connected in amplifier. The exit of amplifier leads a Led.
Each time where lights it means that hits infrared radiation in the sensor.
The circuit allocates moreover a exit in that we can connect a small
acoustic amplifier or even a oscilloscope.
In utmost this resistance is presented a tendency of proportional incident
radiation. If in deed the radiation has been shaped at width then will be
presented in utmost her component of configuration. If for example falls in
the photodiode for some reason a fraction of beam from infrared laser with
configuration by sound then in utmost the resistance will be presented wave
the sound. In this point we added a exit for oscilloscope for a small
amplifier. The tendency of catering should have noise and be clean.
Stabilised power supply it ensures this operation. The stabilisation becomes
with stabilizer of tendency 7808.
click for higher resolution
In order to you make the manufacture you will need printed that exists in
what form , in you will place the materials according to form. At the
placement it should you give few attention in the right time of
semiconductors, transistors passages and stabilizer of tendency. In the
circuit of emitter Q2 it exists a led, which it will turn on each time where
incident infrared radiation in the photodiode. In the exit of Q1 you will
find the same signal strengthened. This signal will contain the at width
unmodulate information that will have the radiation (or this emanates from
telecontrols, or from laser).
|R1 = 47K
||C1,2 = 220nF
||IC1 = 7812
|R2 = 220
||C3 = 10uF
||Q1 = BC547
|R3 = 220K
||C4 = 22uF
||Q2 = BC547
|R4 = 1K
||C5 = 100nF
||D1 = Led
|R5 = 180
||C6 = 100nF
||D2 = TIL81
email@example.com for questions - info