Sine wave power amplification question

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Discussion Overview

The discussion revolves around amplifying a low power sine wave signal (25-40kHz, +/- 5V) to a higher voltage and power level (110V RMS, 50W). Participants explore potential circuits or integrated circuits (ICs) that could achieve this amplification, as well as the feasibility of amplifying a square wave signal similarly.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant expresses a need for help amplifying a sine wave signal to 110V RMS and 50W, asking for suggestions on ICs or circuits.
  • Another participant warns about the dangers of working with 110V RMS, suggesting that a novice should consider lower voltages and seek guidance from a qualified electrical engineer.
  • A different participant asserts their experience with high voltages and requests specific suggestions for IC products that could fulfill their amplification needs.
  • One suggestion is made to consider purchasing a pre-made amplifier instead of designing one, noting that the specifications might align with applications like driving ultrasonic transducers.
  • A participant recommends checking application notes for the National LM12CLK op-amp, which can handle 80 watts, while mentioning that there are replacements available and that the application notes contain useful circuit designs.

Areas of Agreement / Disagreement

Participants express differing views on the safety and feasibility of the proposed amplification project. While some emphasize caution and the need for professional guidance, others assert the original poster's capability and seek to provide technical suggestions. No consensus is reached on the best approach to take.

Contextual Notes

There are unresolved considerations regarding the safety of working with high voltages, the appropriateness of the proposed amplification levels for a novice, and the availability of suitable ICs or circuits for the task.

ajamplifier
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Hello all,

I'm new to electrical engineering, and I'm working on a project that requires a bit more than I'm familiar with. What I'm asking for help on boils down to this: I have a circuit that outputs a low power sine wave (frequency 25-40kHz) with an amplitude +/- 5V at a few watts. I want to amplify this sine wave signal to be at 110V RMS and 50W, or somewhere about there, it's flexible. I'm looking for some sort of IC or simple circuit that will allow me to amplify my input signal, and I was hoping for suggestions from the community.

As a side note, would it be possible to do the same sort of amplification for a +/- 5V square wave rather than a sine wave? Is there some system that would do both?

Thanks very much, an feel free to include as much information as you'd like, I'm hoping to learn something!
 
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The 110V rms is potentially lethal. If you are new to EE, I really wish you would engage a qualified EE to handle such a job. You are engaging to design a power amplifier. This is a mature well documented product, but still, if you've never designed one, I suggest you train yourself with units 24V rms or less. The 110V rms magnitude is too much for a novice. Your first mistake could be your last. Just trying to keep you safe.

Claude
 
Thank you very much for your concern! At the job I work at, we build pulsed power supplies that deliver up to 30kV pulses, and I'm well trained in how to safely deal with high voltages. My lack of familiarity is in what types of IC products exist out there to do what I want. Do you by any chance have some suggestions?

Thanks!
 
You probably don't need to design the amp yourself. The frequency range, voltage, and power look about right for driving ultrasonic transducers for cleaning, etc. Shop around and see what you can buy before you reinvent the wheel.
 
Check application notes for National LM12CLK. It's an obsolete opamp capable of 80 watts , but there are replacements. I built several projects with them before they got so expensive. The appnotes as i recall showed some clever circuits.
 

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