Without the 1k resistors in the above circuit and a 47R resistor connected between the MPSA13G’s emitter and GND, I am getting a good range (but 2V to 3V) with reflected IR from my hand. However I am getting around 50mA running through the resistor, which is not really acceptable given there will be a total of 10 of these circuits forming two crude compound eyes and running off a battery pack.
I am trying to reduce the current to less than 1mA but preserve the voltage range. But the 1k resistors in the above circuit don’t achieve this.
How would you achieve this folks? I can’t seem to figure it out on my bread board.