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8 Threads found on edaboard.com: Howling
When you make a circuit with an IC then you should read the datasheet for the IC. The datasheet for the LM386 shows how the output parts should be connected. The LM386 has fairly low maximum output power. When its output power is too high then it has clipping distortion but with an earphone the gain is probably turned down so there is no clippi
You do not need a full duplex intercom when you use headphones. The circuit is designed to cancel acoustical feedback howling when you use loudspeakers. The circuit is doing what it is supposed to do which is to cancel your voice from coming out of your loudspeakers (your headphones). The original circuit is at and your circu
You did not describe the "background noise". Is it high frequency hiss, low frequency hum, low frequency rumbling or acoustical feedback howling? The design of the 741 opamp is 47 years old. It cannot produce high audio frequencies and was never intended for audio (maybe for a telephone?) so it is noisy with hiss and rumbling. Your circuit also
The howling is not caused by echoes. Instead the howling is caused by the speaker sound being heard by the microphone then is amplified. Since the telephone line has only two wires with transmission plus reception on it then the telephone circuit must use a hybrid circuit to cancel the feedback. Most cheap speakerphones use "voice switching" that m
If the microphone can hear the speaker then you will have acoustical feedback howling. Start with the microphone. Is it an electret type that has a Jfet inside and it needs to be powered or is it a dynamic type with a coil and magnet like a small speaker? The mic needs a low noise preamp. An LM386 is not low noise and is not a preamp, it is a power
This is a project of useful device for wild animals deterrence. It is a simple acoustic deterrent, which uses sound of barking dogs and howling wolves to scare animals. An old MP3 player was used in this device, the signal is amp
Hello All, I need to implement a simple voice amplifier. I have no flexibility on microphone or speaker location and I'm affraid I'll have acoustic feedback (howling). Is there some purely analog method or IC for acoustic echo cancellation? I wonder about hands free telephone operation.... Have they such kind of circuit? Thanks in adv
How the howling can happpen in telephone? Can anyone tell me. Now I am design one small telephone system.


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