Filtering Audio Voltages <4VPK with IC/Circuitry

  • Thread starter Rmac
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In summary, using a clamping/clipper circuit similar to the one found on Wikipedia would be a better solution than using a micro-controller to limit voltage spikes in an audio signal.
  • #1
Rmac
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I'm working on a circuit involving an incoming audio signal via a 3.5mm headphone jack. The circuit cannot handle voltage spikes greater than 4 VPK. Is there any sort of IC, or circuit that allows voltage under 4 VPK to pass through, but filters any voltage over 4 VPK to exactly 4 VPK? The only way I have come up with is to use a micro-controller that samples the incoming audio signal every 50 microseconds and perform the calculations to limit any voltage over 4 VPK. It'd be much easier and cheaper if I could use some sort of IC or circuit to filter the voltage instead of using a micro-controller.

To be clear, I am not trying to filter based off of frequency, I essentially want any incoming audio signal greater than 4 VPK to essentially "platue" at exactly 4 VPK. So if the incoming signal has 3 VPK, it passes into the circuit as 3 VPK. If the incoming signal has 5 VPK, it passes into the circuit as 4 VPK.

Also, sorry if this is a simple question. I'm about halfway through my EE degree, but I can't seem to figure out a way to do this besides using a micro-controller.
 
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  • #2
Rmac said:
I'm working on a circuit involving an incoming audio signal via a 3.5mm headphone jack. The circuit cannot handle voltage spikes greater than 4 VPK. Is there any sort of IC, or circuit that allows voltage under 4 VPK to pass through, but filters any voltage over 4 VPK to exactly 4 VPK? The only way I have come up with is to use a micro-controller that samples the incoming audio signal every 50 microseconds and perform the calculations to limit any voltage over 4 VPK. It'd be much easier and cheaper if I could use some sort of IC or circuit to filter the voltage instead of using a micro-controller.

To be clear, I am not trying to filter based off of frequency, I essentially want any incoming audio signal greater than 4 VPK to essentially "platue" at exactly 4 VPK. So if the incoming signal has 3 VPK, it passes into the circuit as 3 VPK. If the incoming signal has 5 VPK, it passes into the circuit as 4 VPK.

Also, sorry if this is a simple question. I'm about halfway through my EE degree, but I can't seem to figure out a way to do this besides using a micro-controller.

You would use diode clamps or a transistor with base multiplier resistors to clamp at your 4V level.
 
  • #3
berkeman said:
You would use diode clamps or a transistor with base multiplier resistors to clamp at your 4V level.

Thanks so much for your reply. After researching clamping/clipping circuits, I came across this circuit, which I believe is very similar to what you're describing, however it uses an op-amp.

I continued my research further to see if anyone had used a clamping/clipper circuit for audio, however I ended up finding this Wikipedia page about consumer and professional audio line levels. It turns out that consumer audio has a VPK of 0.447 V, and pro audio has a VPK of 1.736 V. It looks like I won't ever have to worry about the voltage peaking higher than 4 VPK anyways!
 

1. What is the purpose of filtering audio voltages <4VPK?

The purpose of filtering audio voltages <4VPK is to remove any unwanted noise or interference from the audio signal. This ensures that the audio output is clear and free from any distortions or disturbances.

2. How does filtering audio voltages <4VPK work?

Filtering audio voltages <4VPK typically involves using a low-pass filter circuit or an integrated circuit (IC) to block out high frequency signals above 4VPK. This allows only the desired audio frequencies to pass through, resulting in a cleaner audio signal.

3. Can I use any IC or circuitry for filtering audio voltages <4VPK?

No, it is important to choose an IC or circuitry specifically designed for audio signal filtering. These components are designed to accurately filter out unwanted frequencies without affecting the desired audio signal.

4. Are there any benefits to filtering audio voltages <4VPK?

Yes, filtering audio voltages <4VPK can improve the overall quality of audio output by reducing noise and interference. This is especially important for sensitive audio equipment, such as recording and playback devices.

5. Are there any drawbacks to filtering audio voltages <4VPK?

One potential drawback is that filtering may also remove some desired frequencies along with the unwanted ones. It is important to carefully select the cutoff frequency of the filter to avoid affecting the audio signal too much. Additionally, using a filter may add some cost and complexity to the overall circuit design.

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