Electronics > Beginners
Scopes and Speakers
eev_carl:
Hi,
I have an audio amplifier circuit working. I can scope it and see it following the input and can hear tones when I put a speaker on it. However, when I try to do the two together -- scope with a speaker -- my output is distorted.
Is there something that I can add to my circuit for purely test purposes that will let me continue to view the output signal while looping in the speaker?
Thanks,
Carl
goldfinger:
--- Quote from: eev_carl on August 07, 2018, 11:21:22 am ---Hi,
I have an audio amplifier circuit working. I can scope it and see it following the input and can hear tones when I put a speaker on it. However, when I try to do the two together -- scope with a speaker -- my output is distorted.
Is there something that I can add to my circuit for purely test purposes that will let me continue to view the output signal while looping in the speaker?
Thanks,
Carl
--- End quote ---
What type of audio amp circuit are you measuring? What is the input and output voltage your running, wattage of amp, power supply rail voltage. With little information you have provided it sounds like maybe your clipping the amplifier.. with some more info people will be able to offer you more informed advice
Sent from my iPhone using Tapatalk
kg4arn:
Schematic?
eev_carl:
I think this is a problem with my circuit, specifically an LM386 power stage. Hooking both the speaker and scope to the preamp output (a 741) doesn't show any of the distortion I was complaining about. I'll close this topic off and pull together the schematic and scope screenshots for a better post.
james_s:
Speakers are notoriously nasty components, the voicecoil moves according to current through it, as well as it produces current when it moves. I would expect the waveform to look pretty nasty when driving a speaker in most cases.
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