Clap on/off switch

[Pauline]

Hi! I am new to this website and also my first time asking for help online. So I am working on a clap switch circuit using NE555 Timer, my problem is, it can only switch on and not off. It does go off automatically using a capacitor but I want it to turn off using another clap. I tried to use 74ls74 d flip flop but the LED only glows and won't turn off even if i use an ordinary switch. So I wanted to use a d flipflop using nand gates as an alternative but I don't know how to apply it. Can someone help me please? 

 

List of components I used:

Condenser mic

BC337 transistor

11kohm

120kohm

1kohm

100ohm

10uF Capacitor

Connecting wires

LED

HD74LS74AP (D-TYPE FLIPFLOP)

NE555 Timer

 

Thank you so much for those will read and reply. 

[GANEEV SINGH]

Hi Pauline

I would suggest you to add a counter IC (maybe a 4017 decade counter or so) just after the 555 timer part. 555 timer's output would serve as a clock for this counter IC. Now when you clap, 555 with generate a high pulse for a certain time period and then go low at its output, this will act as one clock cycle for counter IC and it would increment its output by one, each time you clap. I would recommend you to go through 4017 IC'c datasheet and understand how it can be used for the same.

Good luck

[Pauline]

Thank you for replying! I will try to use that IC and I'll let you know once I got it Thanks again!

[Ashutosh Bhatt]

or you can make bi-stable multivibrator using same IC555 to get ON/OFF kind output

[Author]

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