You should always look at the datasheet for an IC that you are using to see what additional parts are required.
Texas Instruments show a 0.33uF input bypass capacitor and a 0.1uf output bypass capacitor for their uA78xx regulators.
Just a few more changes. T1 base floats when pb switch is open. T1 needs a current limit resistor for base. The NAND gate inputs float when T2 is off. See my attached redmarks. Also I think AG mentioned that your laser diode needs a I-limit resistor, not sure so will let him comment on that.
T1 is an emitter-follower so it does not need a base current-limiting resistor.
The OP said in an earlier post that the laser diode has a built-in current-limiting resistor.
T1 is an emitter-follower so it does not need a base current-limiting resistor.
The OP said in an earlier post that the laser diode has a built-in current-limiting resistor.
I have made some last minute changes to my circuit. Considering all of the mistakes I had my first time around, I figured I would post this just to make sure that it is correct.