Here is simple electronic fun project which is designed using digital gate IC (CD4092BE) called Nocturnal Screamer Circuit using CD4099. In absence of light it produce loud scramming sound but when light is switched on, sound will disappeared. In this way we can used this project for fun.
Circuit Description of Nocturnal Screamer Circuit using CD4099
The circuit of nocturnal screamer is designed using quad two input NAND gate IC (CD4099BE) is shown in figure 1. Here LDR is used as sensor which detects light and change its internal resistance corresponding to the light obtained on it. One NAND gat (N1) is used to sense the level of light, where NAND gates N2 and N3 are used to generate audio frequency. The audio output is given to the base of darlington pair made from transistor T1 and T2 for amplification. The amplified output from is fed to loudspeaker.
The sensitivity of LDR is adjusted by variable resistor VR1. This circuit produces sound only when LDR is kept in dark.
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PARTS LIST OF Â NOCTURNAL SCREAMER CIRCUIT USING CD4099
| Resistor (all ¼-watt, ± 5% Carbon) |
| R1 = 1 KΩ
R2 = 10 KΩ R3 = 33 KΩ VR1 = 100 KΩ VR2 = 47 KΩ VR3 = 100 KΩ |
| Capacitor |
| C1 = 10 µF, 16V (Electrolytic Capacitor) |
| Semiconductors |
| IC1 = CD4093BE (Quad Two Input NAND Gate IC)
T1 = BC147 (silicon NPN transistor) T2 = BDY60 (Bipolar NPN Silicon transistor) D1, D2 = 1N4148 (Small Signal Diode) |
| Miscellaneous |
| LDR
LS1 = 8Ω/0.5W |