Thanks..... I know why the magic smoke escaped... I wired up the new opamp backwards! Note to self. Pin 1 is not pin 8! Anyhow, went and got more components and wired up a new one. Took my time and ensured that it all looked good. Went back to the 4.7k resistors as that is what I had my hand on. C2 doesn't seem to be working. When you turn on the battery and supply a light source c2 gets to about 600mV and then goes down as you apply the meter across c2. Measuring between r2 and r3 the voltage goes up and down in response to the triggering of the receiver. I swapped out the .33uf cap in case that might be the issue. Nup. So what I have below are some pics of the circuit. Which I hope will show what I have.