diode across relay to stop pop
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=101725
Printed Date: May 23, 2024 at 8:52 AM
Topic: diode across relay to stop pop
Posted By: audioman2007
Subject: diode across relay to stop pop
Date Posted: January 30, 2008 at 8:16 PM
I have a relay hooked up exactly like this diagram to run 3 amps and an amp distress indicator. The problem I have is that when I turn my headunit on, I hear a pop from my speakers. Im not sure if its all my speakers (tweeter or speaker) but I hear them pop. I dont have this problem when I first turn my car on, since my headunit is delayed then. Is there a way to connect a diode across the relay and if so, where? Thanks in advance. 
Replies:
Posted By: i am an idiot
Date Posted: January 30, 2008 at 8:30 PM
Posted By: audioman2007
Date Posted: January 30, 2008 at 8:45 PM
Thanks. Would a 1N4004 work?
Posted By: audioman2007
Date Posted: January 31, 2008 at 2:42 PM
Here I thought I had the relay but I dont. This is what I have: I have 3 amps. 1 is for my tweeters, 1 is for my speakers and 1 is for my subs. I have my remote turn on wire running to my sub's amp. Then from there I have 2 wires running to the other 2 amps. I dont have a problem with the amps turning on at all. It is enough power in that wire to turn them all on. I also dont have a problem when they turn on right when I turn my car on. But when the car is on, but the headunit is off, when I turn the headunit on, I hear a pop from my speakers (not sure if tweeters pop also) but no pop from my subs. Could someone explane why this could be happening? Thank you in advance.
Posted By: i am an idiot
Date Posted: January 31, 2008 at 3:01 PM
Where is the remote wire getting power from? Sounds like you have it connected to the switched power source for your deck. There is a turn on delay on nearly every amplifier manufactured. The purpose of the delay is to let the signal coming from your radio to settle down and become useable before the amp turns on. If your amp is staying on when the radio is off, that is the cause of your problem.
Posted By: audioman2007
Date Posted: January 31, 2008 at 4:37 PM
My amps do turn off when I turn the headunit off. My remote turn on wire on my headunit is blue. I have that wire running back to my sub amp then from there I have it splicing out to the other 2 amps. The only time I have a popping sound is when I have my headunit turned off and then turn it on. When its already turned on to when I start my car, there is no popping.
Posted By: tedmond
Date Posted: February 01, 2008 at 7:23 AM
the diode across the relay coils 85 and 86 will only prevent a voltage spike to your amp turn on lead. you can use a timing transitor to delay the turn on and off for 3 seconds. that way you can eliminate poping
Posted By: audioman2007
Date Posted: February 01, 2008 at 9:55 AM
Ok. Well should I get a relay and place a diode across it, or should I not use a relay and just wire a transister in line with the remote turn on lead? What size transister will I need and where can I get them? I know basically nothing about them. Sorry.
Posted By: tedmond
Date Posted: February 01, 2008 at 10:44 AM
i would get a relay, one 1amp diode and a transistor.
Posted By: audioman2007
Date Posted: February 01, 2008 at 3:18 PM
Ok then simply wire the relay like the diagram above, run a diode across 85 and 86 and use a transistor? How do you wire up a transister?
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