Boosting AC Signal for Solenoid: Techniques for Current Amplification

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Discussion Overview

The discussion revolves around techniques for amplifying an AC signal to increase the current in a solenoid, aiming to generate a stronger magnetic field. Participants explore various methods for current amplification, considering both theoretical and practical approaches.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks effective techniques for amplifying a small AC signal (10 V, 10 mA) to several amps for a solenoid, mentioning ideas such as a parallel RLC circuit and using op-amps or transistors with transformers.
  • Another participant suggests using an ordinary audio amplifier to drive the solenoid, provided the frequency is in or near the audio range, and mentions the availability of audio signal generators in schools.
  • A third participant reiterates the audio amplifier suggestion and adds that car amplifier options are also available, particularly in pawn shops.
  • A participant references a similar thread and provides links to a specific product and documentation that may be relevant to the amplification needs.

Areas of Agreement / Disagreement

Participants present multiple approaches to the problem, with no consensus on a single best method for amplification. Various suggestions are made, but the discussion remains open-ended regarding the most effective technique.

Contextual Notes

Participants express varying levels of experience with current amplification, and there are indications of uncertainty regarding the implementation of suggested methods. The discussion does not resolve the technical details of each proposed approach.

Who May Find This Useful

Individuals interested in electronics, particularly those working on projects involving solenoids and current amplification techniques, may find this discussion relevant.

geekusprimus
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Hi, everyone.

I'm working on a project right now where I need to amplify an AC signal to create as much current as possible in a solenoid to generate as strong a magnetic field as I can. I'm likely dealing with a maximum of 10 V and 10 mA from my signal generator, but I ideally need a peak current in the range of several amps. My solenoid is thick-gauge wire and can likely handle the current (we're also looking at cooling options in case the inside gets too hot), but with my limited background in electronics, I'm at a bit of a loss on effective techniques for current amplification. Some ideas I've explored are building a parallel RLC circuit (a resistor in series with the solenoid and a resistor in series with the capacitor) and driving it at resonance or amplifying the power with an op-amp or a transistor and then stepping up the current with a transformer. However, to be brutally honest, I don't have much experience with this scale of amplification, and I don't have a fantastic idea of what I'm really doing.

Do you guys have any recommendations for amplifying small signals into large ones?
 
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If the frequency is in, or near, the Audio range, use an ordinary Audio Amplifier and connect the solenoid in place of the loudspeaker. Amplifier power at your discretion and budget.
 
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Tom.G said:
If the frequency is in, or near, the Audio range, use an ordinary Audio Amplifier and connect the solenoid in place of the loudspeaker. Amplifier power at your discretion and budget.
Schools often have audio signal generators able to deliver an amp or so, so they are available.
 

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