this is a security system when the laser beam is interrupted, ldr should detect and buzzer should ring. The second image is a laser diode driver circuit and the first one is ldr circuit. I tried simulating this in various softwares can someone help me simulating this

 

Hi 2034,
Welcome to AAC.
Which section of your TX and RX do want to simulate, or both.

E

 

Hi 2034,
Welcome to AAC.
Which section of your TX and RX do want to simulate, or both.

E

both

 

Hi 23
This is the RX section.
Do you follow it OK.?
E


BTW: Is this a Homework or College assignment?

 

Hi 23
This is the RX section.
Do you follow it OK.?
E


BTW: Is this a Homework or College assignment?

View attachment 316889

Yes bro

 

Yes bro

Hi 23
This is the RX section.
Do you follow it OK.?
E


BTW: Is this a Homework or College assignment?

View attachment 316889

Can you help me with TX section also

 

Hi its,
Are you again using two different usernames for your posts?

Moderation.

 

No bro this is my friends post
So i am helping him

 

Hi,
Post your best attempt of a simulation and then we can help you.
E

 

Hi,
Post your best attempt of a simulation and then we can help you.
E

 

Hi,
I use a different simulator, please post a circuit diagram
E.

 

Hi,
Post your best attempt of a simulation and then we can help you.
E

Hi,
I use a different simulator, please post a circuit diagram
E.

I have posted the circuit diagram in 1 st thread

 

I have posted the circuit diagram in 1 st thread

Can you help me in finishing this simulation

 

Hi,
I have posted one version in post #4.
This is another version, can you explain to me how it works?
E

 

Hi,
I have posted one version in post #4.
This is another version, can you explain to me how it works?
E
View attachment 316892

Bro can you atach the simulation files
So i can have a look on that

 

Can you help me in finishing this simulation

1. The PNP transistor is your project file is reversed.

2. For simulation purposes, If you want to control the LDR using input from the laser diode (LD), you'll need to couple the LD current with the LDR current based on a current transfer ratio that you determine.

 

Hi eetech.
How is the PNP reversed?

If I understand correctly, the TS wants the buzzer to operate when the laser beam is broken, as shown in the simulation.?

E

 

Hi eetech.
How is the PNP reversed?

I opened the TS Proteus project file and the PNP transistor is not connected as you correctly show on your schematic.
The emitter/collector are reversed.

If I understand correctly, the TS wants the buzzer to operate when the laser beam is broken, as shown in the simulation.?

E

Yes. And that will depend on the laser diode intensity, which is affected by the current flow thru it.
The LD light intensity, focused on the LDR, determines the LDR resistance, which, in turn, determines when the transistor turns on/off the buzzer.

If all the TS wants is an on/off alarm simulation, just use a switch.

 

I opened the TS Proteus project file and the PNP transistor is not connected as you correctly show on your schematic.
The emitter/collector are reversed.



Yes. And that will depend on the laser diode intensity, which is affected by the current flow thru it.
The LD light intensity, focused on the LDR, determines the LDR resistance, which, in turn, determines when the transistor turns on/off the buzzer.

If all the TS wants is an on/off alarm simulation, just use a switch.

Bro can you give me a simulation filee

I opened the TS Proteus project file and the PNP transistor is not connected as you correctly show on your schematic.
The emitter/collector are reversed.



Yes. And that will depend on the laser diode intensity, which is affected by the current flow thru it.
The LD light intensity, focused on the LDR, determines the LDR resistance, which, in turn, determines when the transistor turns on/off the buzzer.

If all the TS wants is an on/off alarm simulation, just use a switch.

Can anyone attach the simulation file
To run the crct ckt

 

hi its,
It is AAC policy not to give final or complete answers to Homework assignments.
Only hints and/or guidance.

Moderation.