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Mosfet Circuit

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You need a 10 k resistor from your clear pin to +5v otherwise the pin is in a unknown state. And AG is correct, you need to bypass your regulator.
 
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.
 

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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.
 

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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.

Okay, thanks for clearing that up :)
 
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.

Thanks
-ILikeComputers
 

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