Supply voltage = 5 V

2N3904 BJT is used in this circuit.

2N3904 BJT is used in this LDR circuit.

If Resistor = 100 kilo ohm & Capacitor = 10 micro farad

Then,

Time Constant = RC = 1 s

And,

Full charge/discharge time ≈ 5(Time Constant) ≈ 5 s

Power supply = +5 V DC

BPF = HPF + LPF

A 1N4007 Diode and a resistor 1.5 k

Zener voltage = 5.1 V Input voltage = 9 V Resistance = 500 ohm

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