Re: [Chevelle-List] Stereo question.

[Herbert Lumpp]

Bob, Steve, Brian,   Thanks for the input.  There's a Radio Shack close by work.  I'll swing by there tomorrow and see if they have anything the will do the job.  Also, the guy from the stereo shop called and his expert suggested I put a cap on the alternator (where the fans get power) that will shunt the excess power to ground.   I doubt this stuff will be expensive so I can try both ideas.   cYa-   Herb ----- Original Message ----- From: Brian Zack To: '[EMAIL PROTECTED]' Sent: Monday, October 07, 2002 7:18 AM Subject: RE: [Chevelle-List] Stereo question. I would think that a diode to stop feedback coming back through the system might do the trick too. (Because they limit current flow to only one direction IIRC)   Brian Zack  '70 Chevelle Malibu mailto:brianz@dpsabq.com -----Original Message----- From: Bob [mailto:[EMAIL PROTECTED]] Sent: Monday, October 07, 2002 4:48 AM To: [EMAIL PROTECTED] Subject: Re: [Chevelle-List] Stereo question. Herbert, I don't think that it is your alternator, but your fans that are causing the problem. When electric fans start, they create a very large voltage spike, that can send feedback through your system. Using a high power amplifier and subwoofer can cause a pop or other noise. The solution is to isolate the fans from the rest of the electrical system with blocking diodes. Bob Walton MCC ----- Original Message ----- From: Herbert Lumpp To: Chevelle List Sent: Saturday, October 05, 2002 8:09 PM Subject: [Chevelle-List] Stereo question. Ok all you stereo gurus...  Hopefully somebody can help, the guys at the local stereo store are stumped.   If I have my stereo on (not loud but normal listening volume) and the electric fans kick on, I get a huge thump through the woofers.   The alternator is a CS130 putting out 105 amps.  The fans turn on/off with a thermo switch through a pair of relays.  The sub amp is running 6 gauge power wire directly off the battery and the fans' main power feed off the alternator.   It sounds to me like the fans are causing the alternator to suddenly put out some juice and the sudden power output is causing a surge through the system resulting in a huge thump through the woofers.  Am I on the right track or way off base? (no pun intended)  Will one of those big capacitors in the power line to the amp absorb the surge or do I need to try something else?   Thanks. cYa-   Herb Lumpp 1966 El Camino ACES 3509, MCC 528 http://users.adelphia.net/~hlump/