hello,
I have a small circuit which has a phototransistor which sends a output voltage when detecting InfraRed light. However, the infrared light coming to the phototransistor is very weak and i only get >1V as its output...
is there anyway to amplify that voltage to atleast 3V ?
No data is transferred. Just an IR beam is received by the photo transistor. the IR comes reflected from a white surface. thats what makes it to become weak.
First measure what logic you get as an output. HI or low, then you may decide wether to use NPN or PNP general purpose transistors to amplify the output. Any ways, in case of confusion, posting your present schematic will fetch better answers. Cheers
measure Vce (not Vbe).
two readings of ,at collector to ground voltage.
i) when no light falls on
ii) when ir light falls on(no reflected . only direct)
have you connected collector and emitter of phototransistor properly ?
do not interchange the terminals(an usual mistake)
check whether 'white glossy board ' is reflecting or absorbing types for infrareds.
(may be from data sheet)