Simple Toy Orgen

This is a toy orgen circuit diagram here I have used very common IC NE555.If you like to generate different sounds you can attach capacitors with different values.according to the value of the capacitor you can change the sound according to your wish.





Note


# Build this circuit on a PCB

# Don't use more than 9v

# Use only push to on switches

Smoke sensitive circuit diagram

Here I am going to introduce you a very important circuit.It is nothing but a smoke sensitive circuit .In the market we can see there are lots of expensive smoke sensitive kits.But I'm going to give you a very simple method to make a smoke detector.Here i have used a dark sensitive circuit.When the smoke goes via LEDs and LDR it will generates a sound.If you want to operate another circuit firstly remove the speaker and add a really for there.then you can operate your circuit through that really.





Note

# Build this circuit on pcb

# Don't use more than 9V

#Use Blue colour LEDs