Please see the attached circuit.
I'm thinking of building this circuit but would like to know if the following modifications can be done;
1. How would I go about running the circuit off a 9V battery instead of 5V?
2.Is it possible to INTERGRATE A phototransistor into the circuit? Then have a switch that will give the option of sound detection or light detection. How can this be done?
3.Is the 5V in this circuit connected to R4 or is it perhaps just a bad copy of the drawing? Would it make sense to do this in other words?
Thanks for you help and your time - JDR04
I'm thinking of building this circuit but would like to know if the following modifications can be done;
1. How would I go about running the circuit off a 9V battery instead of 5V?
2.Is it possible to INTERGRATE A phototransistor into the circuit? Then have a switch that will give the option of sound detection or light detection. How can this be done?
3.Is the 5V in this circuit connected to R4 or is it perhaps just a bad copy of the drawing? Would it make sense to do this in other words?
Thanks for you help and your time - JDR04
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