In that case you should be aware that the UK uses a different caller ID system to the USA. You should also be aware that you are not allowed to connect non-approved apparatus to the UK telephone network (and approval costs in the thousands, if not tens of thousands), it's seriously frowned upon, and carries unlimited fines.adrian120 said:i'm in the uk
IR filters only tend to have a limited effect, they reduce visible light, not block it all together - the casing of the photo-diode already incorporates an IR filter, and you have found how effective that one is!.adrian120 said:maybe you could give me some info on a IR filter? i need a filter to block out ambient light and sunlight for a ir photo diode. looked at maplins and rs no luck, found a internet site but that was quite expensive. your input would be helpfull, thank you.
The circuit doesn't look very practical, with no -ve supply to the opamp it's liable to be holding the transistor permanently on anyway. Have you considered AC coupling the transistor?, the incoming IR is modulated with a 38KHz carrier - you don't need to pass any DC content (because there is none!).adrian120 said:i'm am using this circuit as a remote extender from one to room to control a satalite box for tv in another room. LED1 in the circuit in a normal LED which when recieves a signal via the photodiode (sfh2030) will flash. LED1 stays on all the time unless it is in near darkness, thats why i need some way to filter out unwanted light. LED0 is the ir emitter diode.