Before I get this circuit built could someone sanity check the basics for me please? The follow circuit is designed to be a simple 1 way IR transmitter to allow a USBizi100 to send info to another.
I would have used an IrDA but space doesn’t allow and board orientations are wrong.
The net ‘Bottom’ is being driven by an output on USBizi #1 and the net ‘Top’ is being picked up by an input on USBizi #2.
I know that the IR frequencies don’t line up perfectly (LED wavelenght is 880nm and peak wavelength on the IR Phototransistor is 935nm but 880nm still gives me ~95% relative response on the OP500.
Something in my gut is saying I have missed something simple on this bit of my circuit so thanks in advance,
I have ‘tried’ being the operative word, but as 3 of the items are very delicate SMT devices some with ridiculously fragile leads (BC847B) I got hacked off with my sausage fingers and went back to the maths again. I was on my way to order a bunch of non SMT equivalents but thought I would ask the question first.
It all seems good on the maths side but there is nothing quite like experience to cast a eye over the project and say, “No, tried that a while back and it didn’t work, try this…”
Thanks for that. Guess my radar is just firing a bit off at the moment so things feel wrong when they aren’t! Good to have somewhere like this to sanity check things.
Unfortunately can’t say much about the project at the moment but will be able to say more on the 1st March
