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Electronics › Electronics › Clap on/off switch
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.
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
Thank you for replying! I will try to use that IC and I'll let you know once I got it Thanks again!
or you can make bi-stable multivibrator using same IC555 to get ON/OFF kind output