Recent content by ipmac

Question: For my project, I need a Opamp which automatically adjusts the resitance Rf to a constant Gain. So, I won't have to vary the resistance using a potentiometer instead. Can you please name any of such Opamp?

" From there, you can repeat the process for different distances. It's most likely that you find that the voltage at the receiver falls as an inverse square of the distance (1/d)^2. To keep things simple, pick an input resistance and stick to it (10kOhm is my suggestion). The only thing that...

As far as my understanding, we first determine the characteristic impedance by computing the input impedances Zo(open) and Zs(short) in Laplace domain when terminating the other port with impedances infinity (open) and zero (short). The characteristic impedance follows squrt(Z0.Zs). This is one...

I have to find the absolute value of the transfer function for the circuit shown in the attachment. However, I have capacitors instead of inductors in my circuit and inductors instead of capacitors. So, the cross circuit will have L in the upper and lower branch and two C in the cross. I...

thanks guys it really helps! :-)

Thanks but it became a bit unclear to me as I am a beginner :( I need to build an opamp circuit in such a way so that the received signal in DSP board would be few 100mV. I think there should be a general formula for the gain of the opamp based on the distance(radius) from the receiver to...

thats really helpful...but what is the crieteria for designing the opamp...for eg: I sent 5V and received 3 V at receiver...how should the op-amp be designed so that the received signal will be suitable for the operation in DSP board?(to bring the level up to a level that can be sampled.)

I am using the following receiver and transmitter for my project to form a ultrasonic communication system. I transmitted 5V Peak to peak voltage, 40 Khz frequency sinusoid from the transmitter and received the signal through the receiver. But the receiver shows the peak-to-peak voltage of about...