Kevin Gallagher
New Member
Hello,
I'm building an ultrasonic tape measure and am having trouble obtaining a distance greater than 1 metre. I have an idea to try and get a greater distance: I think that maybe I am losing a lot of my transmitting power because the output impedance of my oscillator is not matched well enough to ultrasonic transducer and similarily at the reciever.
The oscillator is the 4047BE and in the datasheet there is no talk of output impedance. Does anybody know what it is or how i could find it. The o/p of osc is fed directly to transducer which is SCS-401T. At the reciever the rx transducer (SCM-401R) is fed directly through a capacitor and then to a 10k resistor which is the input resistor for the amplification stage.
On the datasheet for the transducer it says the impedance is approx 500 ohms for txer and 30 kohms for the rxer. Is this the same value for i/p and o/p impedance cos it just says impedance.
I would really appreciate any help anyone could offer me.
Thanks
I'm building an ultrasonic tape measure and am having trouble obtaining a distance greater than 1 metre. I have an idea to try and get a greater distance: I think that maybe I am losing a lot of my transmitting power because the output impedance of my oscillator is not matched well enough to ultrasonic transducer and similarily at the reciever.
The oscillator is the 4047BE and in the datasheet there is no talk of output impedance. Does anybody know what it is or how i could find it. The o/p of osc is fed directly to transducer which is SCS-401T. At the reciever the rx transducer (SCM-401R) is fed directly through a capacitor and then to a 10k resistor which is the input resistor for the amplification stage.
On the datasheet for the transducer it says the impedance is approx 500 ohms for txer and 30 kohms for the rxer. Is this the same value for i/p and o/p impedance cos it just says impedance.
I would really appreciate any help anyone could offer me.
Thanks