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How to Fix DC Offset and Transformer Hum In Your Audio ...
https://www.pooraudiophile.com/2015/03/how-to-fix-dc-offset-and-transformer.html#:~:text=DC%20Offset%2C%20sometimes%20called%20%E2%80%9CDC%20in%20the%20AC%2C%E2%80%9D,cases%2C%20DC%20offset%20can%20even%20damage%20your%20equipment.
Amplifier DC Offset - How Much is OK? | diyAudio
https://www.diyaudio.com/community/threads/amplifier-dc-offset-how-much-is-ok.131962/
If your power amp is DC coupled ( not many are as the gain at DC usually reverts to unity ) and if there is no coupling cap at the power amp input then any DC applied to the input will be passed to the output. Depending on the offset of the power amp this could increase or decrease any offset present.
operational amplifier - Audio DC Offset - Electrical ...
https://electronics.stackexchange.com/questions/395633/audio-dc-offset
So my current exercise is to use a DC offset circuit to shift my AC signal into the 0-5V range. Currently I am using a line-out from my phone using a mono 1/8 inch jack. As the signal from my phone is weak (200 mV) have to amplify the analogue signal from my phone using the LM386. The circuit I used was a non-inverting amplifier (Figure 1).
How to Fix DC Offset and Transformer Hum In Your …
https://www.pooraudiophile.com/2015/03/how-to-fix-dc-offset-and-transformer.html
DC Offset, sometimes called “DC in the AC,” is usually the result of unbalanced loads or flaws in the power distribution system. This can cause DC current flow in the transformers that power your audio equipment, making them run hotter and produce an audible, mechanical hum. In some extreme cases, DC offset can even damage your equipment.
Audio amplifier DC offset protection | All About Circuits
https://forum.allaboutcircuits.com/threads/audio-amplifier-dc-offset-protection.76028/
If the DC offset at the output to the loudspeaker is excessive, there goes your speaker. A simple solution is to put a resettable thermal fuse or an incandescent light bulb in series with the loudspeaker. Once, when setting up for a gig, the rented system went into feedback mode and I saw the speaker light up. I was sure the speaker was blown.
What is DC offset? | diyAudio
https://www.diyaudio.com/community/threads/what-is-dc-offset.118419/
Ideally, there will be no DC voltage (offset voltage) across the speaker terminals of an amplifier. Most amplifiers have a small amount of DC. Most people (those building or repairing amplifiers) consider 0.025v or less to be acceptable. 0.1v may be acceptable for others.
Amplifier DC offset…. - Amplifiers/Preamplifiers • Canuck ...
https://www.canuckaudiomart.com/forum/viewtopic.php?t=45008
Quick hypothetical situation: an amp is driving a speaker that reaches its max excursion at +/- 10V with 0V DC offset. If the amp has 1V of DC offset on the positive side of the waveform, the speaker can be driven to max excursion with only +9V on the + side of the waveform and -11V on the negative side of the waveform.
Testing DC Offset - hudsonvalleyhifi.com
http://hudsonvalleyhifi.com/tutorials-and-tech-support/checking-for-dc-offset
Volume minimum, tone controls off or flat, and balance centered. Turn the amp on and allow to warm up for 2-3 minutes. Place the positive probe (usually red) in the positive terminal, and negative (usually black) into the negative terminal. Check for DC voltage in mV. Do the same for other channel. After 8-10 minutes retest.
How to Measure DC Offset: 5 Steps (with Pictures) - …
https://www.wikihow.com/Measure-DC-Offset
The ideal amount of DC offset is 0, which results from a perfectly balanced AC sine wave. In reality, an offset between 0 and 20 mV is very good. An offset between 20 and 50 mV is slightly higher than the ideal range, but the distortion caused will barely be audible.
DC on op-amp input, audio amplifier - Electrical ...
https://electronics.stackexchange.com/questions/445349/dc-on-op-amp-input-audio-amplifier
If I measure the volume control output without connecting it to the amplifier, i measure a DC offset < 10 mV (Still after C1 and with R1). If i connect the volume control to the amplifier, i am able to measure a DC offset of 350 mV on the non-inverting input of the amplifier.
Classical Candor: On Power Amplifier DC Offset…
https://classicalcandor.blogspot.com/2019/10/on-power-amplifier-dc-offset.html
It’s known as DC offset, and it has direct bearing on the dynamic range capability of your low frequency loudspeakers. Fluke 87V Multimeter When a high quality audio power amplifier is in a quiescent state (operational, but no input signal), its output terminals will normally measure nearly zero AC and zero DC volts.
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