What type of structure would house the circuit most effectively?

Its a circuit that has to have a darkness-detector sensor

Circuit of an automatic darkness detector sensor

What kind of circuit?

We can help you if you explain the purpose of this circuit.

A circuit with an LED because it switches on when light fades and a circuit with an LDR because it is a light sensor

A circuit with an LDR

It's a circuit that has to have a darkness detector sensor

A circuit that has an LDR, Resistor, NPN transistor and a LED

circuit with an LDR

INVESTGATE THE DARK SENSOR CIRCUIT on the right and answer the question

IT IS EITHER AS PARALLEL OR SERIES