can anyone explain me the circuit

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saam12

New Member

• Dec 15, 2010

• #1

hiii can anyone tell me the appropiate justification and calculation for the circuit

with many thanks

 

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MikeMl

Well-Known Member

Most Helpful Member

• Dec 15, 2010

• #2

Poorly conceived LED flasher? Where is the current limiting between the gate and leds? What prevents one of the leds from hogging all of the current? TTL can sink a lot more current than source, so use a NAND, not an AND, and drive the LEDs between 5V and the gate...

What is the monkey motion involving the 100uF? Some sort of slow-start attempt?

 

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saam12

New Member

• Dec 15, 2010

• #3

how about if i placed LDR with variable resistor

 

MikeMl

Well-Known Member

Most Helpful Member

• Dec 15, 2010

• #4

What are you trying to do?

 

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saam12

New Member

• Dec 15, 2010

• #5

my idea is design a circuit for glider
when it start to fly the led flash on and when its landing it turns off completly
thanks for replying me mike

 

MikeMl

Well-Known Member

Most Helpful Member

• Dec 15, 2010

• #6

Ok, so will the LDR be mounted on the underside of the glider so that not much light will reach the LDR when the glider is on the ground, but when the glider is more than a few cm above the ground, the LDR is illuminated by ambient light?

If so, have you done any measurements to see what resistance the LDR has both on the ground and in the air?

Presumably, you would like the change in resistance to turn on the flasher?

Would the flasher be used to see the glider in the air? If so, wouldn't the flasher also be useful to help you find the glider after it lands?

 

Last edited: Dec 15, 2010

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saam12

New Member

• Dec 15, 2010

• #7

ok what do u think then do you any idea can you show me what circuit do i have to use

 

MikeMl

Well-Known Member

Most Helpful Member

• Dec 15, 2010

• #8

saam12 said:

ok what do u think then do you any idea can you show me what circuit do i have to use

Click to expand...

Answer my question about the LDR resistances.

I need to know: Battery voltage?
LED specs: Vf and current?
Flash rate?

 

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saam12

New Member

• Dec 15, 2010

• #9

actually i dont know this is my initial design and i dont know if is it right or wrong

 

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saam12

New Member

• Dec 15, 2010

• #10

i havent done any measurment can you please if you have an idea how to design the circuit tell me with many thanks

 

blueroomelectronics

Well-Known Member

• Dec 15, 2010

• #11

Is this for a toy glider?

 

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saam12

New Member

• Dec 16, 2010

• #12

is it bistable or monostable circuit