Boosting AC Signal for Solenoid: Techniques for Current Amplification

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SUMMARY

This discussion focuses on techniques for amplifying an AC signal to drive a solenoid, aiming for peak currents in the range of several amps from an initial signal of 10 V and 10 mA. Key recommendations include using an ordinary audio amplifier to replace the loudspeaker with the solenoid, leveraging audio signal generators available in schools, and exploring car boomer amplifiers as cost-effective solutions. Additionally, building a parallel RLC circuit or utilizing op-amps and transformers for current amplification were suggested as potential methods.

PREREQUISITES
  • Understanding of AC signal amplification techniques
  • Familiarity with audio amplifiers and their specifications
  • Basic knowledge of RLC circuits and resonance
  • Experience with op-amps and transformers for power amplification
NEXT STEPS
  • Research how to build and tune a parallel RLC circuit for resonance
  • Learn about audio amplifier specifications and selection criteria
  • Explore the use of op-amps for signal amplification in electronic circuits
  • Investigate the application of transformers for stepping up AC current
USEFUL FOR

Electronics enthusiasts, hobbyists working on solenoid projects, and engineers seeking effective methods for AC signal amplification.

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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