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Questions tagged [hum]

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5
votes
2answers
188 views

Troubleshooting Hum in a Tube Guitar Amp- Resolved!

I have a Fender Deluxe Reverb Reissue guitar amplifier that hums whenever I turn on the reverb. It sounds like loud 60 cycle hum. The reverb effect is still applied, but is accompanied by the hum. ...
7
votes
3answers
339 views

Fender Telecaster guitar makes loud humming noise, stops when player touches strings/metal parts

I have a Fender Telecaster that hums loudly--much more so than other similar guitars. It's a standard Tele with single-coil pickups. The humming noise stops when the player touches the strings or ...
1
vote
1answer
157 views

Triac dimmer makes audible noise (hum or buzz)

I have some triac dimmer from IKEA (bought several years ago). This dimmer makes audible noise (hum or buzz), very notable during night when it is placed on a bedside table. I failed to find the ...
1
vote
1answer
340 views

Active Tone Control Hum and Buzz in Potentiometer

Here is another problem with my circuits, that I cannot solve. I am working on analog active tone control - Bass, Volume and Treble with TL081/82 chips. The reason I put volume control on the output ...
0
votes
1answer
193 views

Plus, Minus, Ground and the damn noise

I am a relatively newbie here and I am trying to build this project... so do not kick me hard and forget any stupid errors you see on the project. I appreciate any suggestions, criticism, etc., ...
0
votes
1answer
56 views

Getting rid of charge injection click and hum sound on this switch I have designed

I have designed this 4 stereo channel TRS switch. You have 4 channel stereo input and 1 stereo channel out. You press a button and you switch which channel you want to send to the output. Once the ...
0
votes
0answers
84 views

Measurement setup for power line spectrum

I've come across a setup for measuring AC power line spectrum. Here is the spectrum graph which shows 60Hz and harmonics in a power line voltage: And below is the setup and wiring for this ...
1
vote
1answer
2k views

Noisy amplifier for HB100 doppler module

I'm working on a doppler radar based on the HB100 module. I want to sample the signal using a microcontroller and display the speed on a LCD. But I want to have the analog front-end working properly ...
5
votes
2answers
3k views

50/60Hz Noise Harmonics

I want to wirelessly communicate over low frequencies (<1kHz), and I noticed during some tests that 60Hz noise is showing up a bit at 180Hz (3rd harmonic), and also slightly at 300Hz (5th harmonic):...
5
votes
1answer
826 views

phono preamp hum - ground loop?

I've built a simple 2 stage active/passive phono preamp. Everything in terms of amplification/frequency response/lack of distortion works fine - just as it was designed. The only thing is that hum can ...
0
votes
2answers
253 views

How good should the regulated AC/DC power supply filter be in tube headphone amp?

I am building a tube headphone amplifier. I built a AC/DC regulated power supply (220v AC to ~250v DC) but I am not sure about how good is the filter. The filter contains 120uF and 68UF capacitors, in ...
0
votes
1answer
352 views

eliminating audio hum

I'm working on a circuit that feeds a microphone into the ADC of the STM32F4 Discovery and then outputs that exact signal out of the microcontroller's DAC and then to a headphone jack. I am able to ...
0
votes
1answer
1k views

Remove mains hum out of amplifier

I have a headphone amplifier that is afflicted by mains hum 50 Hz and upper harmonics, below is an FFT of the spectrum with nothing connected to its inputs. In headphones you can clearly hear a buzz-...
1
vote
1answer
168 views

My printer injects hum into my USB ports [closed]

I have a Brother HL-L2305 laser printer. I love it. I also have a pair of KRK Rokit 6 G3 speakers that I run off of an MBox 3. Every time I plug the printer into any USB port, hub or not, a loud hum ...
4
votes
1answer
994 views

How do you know if a vacuum tube is going to suffer from AC hum or not?

I know that technically there is little difference between AC or DC heating of the tube - if it gives proper voltage everything is fine... Except the hum: I have read in various sources that some ...
2
votes
3answers
623 views

Mains hum without ground loop

When I hook a device to the monitor input of my digital piano, I get a very noticable 50Hz hum. I understand that the monitor input doesn't have to be particuarly good quality, but it really is ...
0
votes
1answer
387 views

Hum Cancelling Circuit

Consider the following circuit: I was just thinking about how connecting consumer grade unbalanced electronics together has a tendency to generate hum. For example, I have a little mixer that has an ...
2
votes
3answers
5k views

How to filter hum from transformer for audio rectifier

i´ve just build a prototype speaker from a TDA7293 (http://www.ebay.de/itm/TDA7293-85W-100W-Mono-Audio-AMP-Amplifier-Board-AC12-50V-Update-vision-TDA7294-/201478109342), the circuit is quite ...
1
vote
2answers
1k views

How to remove mains hum from a BNC cable?

BNC cables are used as inputs to a data-acquisition hardware. If long BNC cables are picking up the 50/60Hz mains hum through the air like antenna, how can I filter this? Would connecting the BNC ...