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car_alarm receiver: Pl explain the working of this ckt

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egemini

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receiver ckt

This opeartes at 433Mhz. Please expalin how this receiver ckt woks.
thank you
 

this is primitive type of reciever,
first stage is RF amplifier tuned at 433Mhz and second stage gives ouput when 433Mhz is recieved.

plz provide transistor number and tuning coil value so we can go in more deep.
 

Hello thats an off hand description.
Would you please explain it in some more detail, I think for that purpose coil and bjt info is not required.
thanks..
 

It is a super-regenerative receiver.

First stage is antenna matching.
Second stage is RF signal amplify + filtering and pulse reforming.
 

Code: 
[quote]First stage is antenna matching. 
Second stage is RF signal amplify + filtering and pulse reforming[/quote]

second stage is having bandwidth of 1Mhz only so it can handle high frequency
if we invert : inverting and non-inverting pins of opamp then we can think this as comparator with hysterisis.

first stage is antenna matching : tank ckt frequency selection, transistor is front end of receiver(super-regenerative receiver).
 

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