Two Different Sound Generator

Two Different Sound Generator

Summary
This circuit can be used to generate two different sound when you press the switch it will produce two different sounds like morse code. The circuit is built around the CD4060 and CD4001 IC and few more components. IC CD4060 is 14 stage ripple carry binary counter, divider and a oscillator. Its built in oscillator is main feature of this IC that’s why it can be used in numerous application like flasher, clock generator r in timer circuits. And CD4001 is the most commonly used Complementary Metal Oxide Semiconductor (CMOS) chip.  It comes in a 14 pin Dual Inline Package (DIP). It consist of 4 
independent NOR gate in a single chip. Each gate has 2 inputs and 1 output.
As we can see in the truth table it will provide the output equal to one when both of the input is low. In another words we will receive the high output when both the signals goes low. And if any the inputs are high we will receive the low output.
Description
Hear IC1 is working as frequency dividing circuit. In this internal oscillator stage is made using resistor and capacitor which can be connected to pin 11,10 and 9. Hear capacitor is connected to pin 9 and pin 11 and 10 is connected with a capacitor. Most probably pin 10 is connected a variable resistor  so that we can select different frequency range and we are using a fix resistor so that while adjusting pot pin 10 value may not fall to zero. And free pin of all three are connected together.

One thing we must take care that value of resistor connected to pin 10 including variable resistor should be 10times less than resistor connected to pin 11. We have connected to pin 12 reset input to ground for enabling the IC to oscillate. And remaining pin of IC generates oscillation at specific rate. The rate is in multiple of two for the entire sequence of pin out.
Now for understanding the working of circuit in this pin 4 provides the lowest frequency or pulse for highest time interval and pin 7 provides highest frequency or pulse with lowest time interval. In this pin 4 and 7 provides audio signal which is given to pin 1 and 8 of NI1 and NI3 of IC2. Now NI4 control the frequency provide to NI3. Now when control signal matches with NI1 during low frequency at the same time control signal at NI4 is high matches with NI2.Output at pin 3 of NI1 will be in same condition therefore we will get low at both pin of NI2 hence we receive a signal at output which is then amplify by transistor and we will hear two strokes of sound.
Component Required

IC
CD4060	1
CD4001	1
Resistor
R1(200K)	1
R2(10K)	1
Vr1(10K)	1
R4(1K)	1
Capacitor
C1(.1uF)	1
T1(BC547)	1
LS(Loud speaker)	1
S1(Push to on switch)	1