IR Link
Circuit :Milan Markovic
Email : [email protected]
English Notes : Andy Collinson
Description:
A basic Imfra Red Link for audio communication for distances upto 3 metres.
Notes:
Ovo je shema jednostavne bez?i?ne komunikacije
sa malo komponenata .Diode d1 i d2 su infracrvene
le-diode ,a foto transistor je tako?er infracrveni radi ?to
manjeg vanjskog utjecaja .Domet ure?aja je oko 3m
no on se mo?e promijeniti brojem le-dioda i naponom
koji se dovede na diode.Na izlaz se ?ak mogu i
direktno spojiti slu?alice.Link mo?e poslu?iti i za prijenos
drugih vrsta signala..Na popisu komponenata nema
kriti?nih dijelova i izrada sklopa je jako jeftina.
Uz malo pa?nje ne moe da ne radi.
P.S Transistors can be replaced with 2N3904 and 2N2222
Notes:
In his circuit Milan has created a basic Infra Red transmitter and receiver. The transmitter comprises a single
amplifying stage driving two series connected IR LEDS. The input source is connected to J1. Please note that
the device will pass a small DC current through it and also directly bias the transistor. A suitable device is
therefore a high output crystal microphone. These can produce high output voltages up to 1 Volt but this will be
reduced by the transistors low input impedance.
The receiver is three stages, the first stage being a phototransistor. Stages two and three form a high gain
darlington emitter follower, the bias for the whole stage derived through R2 and the phototransistor itself.
C1 and R3 form a filter to reduce interference from flourescent lighting and other hum sources. The output is via
Jack J2. Note also that the output device will pass a small DC current so a medium impedance loudspeaker or
hwadphones are a good choice here.
Source: http://www.zen22142.zen.co.uk