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How to build a ultrasonic receiver circuit

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Vicountboo

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tone decoder 40khz

Hi

I have built an ultrasonic transmitter (using 40khz & 555).
I'm trying to build an ultrasonic receiver circuit and have the output displayed on 7 segs or LED displays.
What would steps would I need to take to build it.

Thanks
 

post16/ultrasonic/circuit

I say, NE555 is not stable at all, don't use it, cause 40Khz frecuency will always moving from central value, then you will have many headaches.

Use LM567 for generate the 40kHZ frecuency, and other LM567 for receiver, it is a good tone decoder. You can use it as a oscilator or a tone decoder, and it have 18mV of sensibility. Only thing you must care is the type of capacitor, it's recomended use a NP0 capacitor, because it don't change the value due to temperature variations.
 

Check this :

**broken link removed**
 

Re: Receiver circuit

There are a tone detector applications using PIC. Try to find at Microchip Website
 

Re: Receiver circuit

Simply the best:
**broken link removed**

Saulius
 

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