I posted a query about a miilisecond timer a couple of weeks ago. Got some useful responses, but are not sure I will be able to realize the project.
One of my current problems is the matching of an IR-phototransistor and IR-photodiode.
In the following schematics a LD274 is coupled to a BPW40:
http://www.circuitsonline.nl/circuits/view/50
But I found out that the LD274 emits at 950 nm while the BPW40 has its optimum at 760 nm. (info from www.segor.de)
Can anybody advice me if this is indeed a mismatch and what should I use???
One of my current problems is the matching of an IR-phototransistor and IR-photodiode.
In the following schematics a LD274 is coupled to a BPW40:
http://www.circuitsonline.nl/circuits/view/50
But I found out that the LD274 emits at 950 nm while the BPW40 has its optimum at 760 nm. (info from www.segor.de)
Can anybody advice me if this is indeed a mismatch and what should I use???