How to delete a signal

Hello!I have a construction with two coils,of a transmitter and a receiver one next to the other and at a distance of 1 meter between them. A 1volt signal is induced in the receiver coil by the transmitter. My problem is that I have to completely turn off the 1volt signal on the receiver because I have to make a big boost to get the signal from a metal target that I have in front of the receiver coil. Any idea? Thank you for your time and best regards!!!

by Christos7
January 04, 2021

Using an OpAmp? If you can get the "1 volt (peak-to-peak) " alone and the "1 volt + signal of interest", you can use an opAmp to subtract these two "inputs".

As example, maybe you can place an antenna (probe) close to the signal to get, with the 1 volt added to it, and another antenna "far" away, so you get more or less just the 1 volt (variable) signal, simply because the antenna is too far from what you are interested to but still able to capture almost the same "noice" of 1 volt. And if the two "one volt" thingies are not exactly equal, you can probably "amplify" one just enough before you add, sorry, subtract, them. It may be touchy, but at first glance, there are cases where it could be possible to do it like that.

You can also use filters, active or not, but those remove "both" signal for some frequencies. That is usable if the one volt signal is at a much higher frequency than the signal of interest, but not the other way around (generally).

by vanderghast
January 05, 2021
Add comment...

Please sign in or create an account to comment.

No Answers

No answers yet. Contribute your answer below!

Your Answer

You must log in or create an account (free!) to answer a question.

Log in Create an account

Go Ad-Free. Activate your CircuitLab membership. No more ads. Save unlimited circuits. Run unlimited simulations.

Search Questions & Answers

Ask a Question

Anyone can ask a question.

Did you already search (see above) to see if a similar question has already been answered? If you can't find the answer, you may ask a question.

About This Site

CircuitLab's Q&A site is a FREE questions and answers forum for electronics and electrical engineering students, hobbyists, and professionals.

We encourage you to use our built-in schematic & simulation software to add more detail to your questions and answers.

Acceptable Questions:

  • Concept or theory questions
  • Practical engineering questions
  • “Homework” questions
  • Software/hardware intersection
  • Best practices
  • Design choices & component selection
  • Troubleshooting

Unacceptable Questions:

  • Non-English language content
  • Non-question discussion
  • Non-electronics questions
  • Vendor-specific topics
  • Pure software questions
  • CircuitLab software support

Please respect that there are both seasoned experts and total newbies here: please be nice, be constructive, and be specific!

About CircuitLab

CircuitLab is an in-browser schematic capture and circuit simulation software tool to help you rapidly design and analyze analog and digital electronics systems.