Speaker Crakle from Fan

TheDriver · 21st July 2008, 07:57 AM

Whenever I turn on or off my fan, I get a crackle though my speakers,

The speakers are a pair F200a by John K and are driven by a gainclone amp / pioneer receiver pre-amp.

Why is this happening?

And how can I fix it? Maybe a coupling cap?

Thanks,
Matt

DigitalJunkie · 21st July 2008, 08:19 AM

Is it a DC fan,or AC?

If it's DC,a simple CRC (or CLC) filter might help.I usually have good luck with a simple CRC on most brush-less DC fans. I've had problems with them causing humming/buzzing noises before.

TheDriver · 21st July 2008, 08:51 AM

I haven't taken it apart yet. But I believe it is a AC fan. It's is a normal portable house fan.

REC1 · 21st July 2008, 01:02 PM

GCs are very sensitive to EM radiation. I always enclose the amp in an alum box and ground the box. Faraday cage.

Once someone had built an open GC on a breadboard and kept stating that he was hearing Mexican Rap music in the background, still funny to me.

ron

Pano · 22nd July 2008, 03:38 AM

I hadn't thought about EMI - but that's great advice.

I just thought it was electrical noise on the AC lines kicked in by the fan. Motors are electrically noisy. A line filter might clear it up.

21st July 2008, 07:57 AM	#1
TheDriver diyAudio Member Join Date: Jul 2004 Location: Iowa City, IA	Speaker Crakle from Fan Whenever I turn on or off my fan, I get a crackle though my speakers, The speakers are a pair F200a by John K and are driven by a gainclone amp / pioneer receiver pre-amp. Why is this happening? And how can I fix it? Maybe a coupling cap? Thanks, Matt

22nd July 2008, 03:38 AM	#5
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	I hadn't thought about EMI - but that's great advice. I just thought it was electrical noise on the AC lines kicked in by the fan. Motors are electrically noisy. A line filter might clear it up. __________________ Take the Speaker Voltage Test!

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21st July 2008, 08:19 AM	#2
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Is it a DC fan,or AC? If it's DC,a simple CRC (or CLC) filter might help.I usually have good luck with a simple CRC on most brush-less DC fans. I've had problems with them causing humming/buzzing noises before.

21st July 2008, 08:51 AM	#3
TheDriver diyAudio Member Join Date: Jul 2004 Location: Iowa City, IA	I haven't taken it apart yet. But I believe it is a AC fan. It's is a normal portable house fan.

21st July 2008, 01:02 PM	#4
REC1 diyAudio Member Join Date: Jun 2008	GCs are very sensitive to EM radiation. I always enclose the amp in an alum box and ground the box. Faraday cage. Once someone had built an open GC on a breadboard and kept stating that he was hearing Mexican Rap music in the background, still funny to me. ron

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