who can explain more on this circuit....pls help me!!!

Status
Not open for further replies.
R1, C1 & IC1a provide Power On reset. IC2 & 3 are counters. IC2 has an ocsillator - the timing is set by R2, R3 & C2.

Sw1 selects the time delay. IC1c modulates the buzz.
 
Last edited:
Now I've had more time to study the circuit.

IC2 divides the oscillator frequency by 128. IC3 counts this frequency and when the count reaches the point set by Sw1, the output of IC1c starts pulsing at the oscillator rate. IC1d inverts these pulses and, when high, Q1 is turned on thus activating the buzzer. The pulses via R4 and D1 eventually discharge C1 thus causing the counters to be reset. Thus the timing starts again.
 


what do you mean that IC2 divides the oscillator frequency by 128?
 
ic2 is an oscillator cum ripple counter with different division taps , here it is used as /128 mode . read the datasheet of 4060
 
drinalds said:
what do you mean that IC2 divides the oscillator frequency by 128?
Click to expand...
If the oscillator frequency was say 1000 Hz, then the output would be 1000/128 = 7.8 Hz

So if you want say 1 second increments, then set the oscillator to 128 Hz so the output will be 1 Hz. Then Sw1 will allow you to chose the delay in 1 sec increments.
 
Status
Not open for further replies.

Similar threads

T
  • Question
can someone help me do this in falstad, thank you.
Replies
18
Views
2K
timmychangga
T
D
Can anyone explain what is happening to this battery?
Replies
4
Views
1K
Tony Stewart
K
Help identifying this
Replies
4
Views
787
Kaltal
K
P
  • Question
I'm carrying out smart energy management systems project. I'm looking for someone in Nigeria who can help me out.
Replies
7
Views
1K
Nigel Goodwin
G
  • Question
Explain how this circuit can actually work?
Replies
3
Views
7K
Tony Stewart
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…