Lighter adapter noise - Page 2 - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 15th October 2008, 11:32 PM   #11
diyAudio Member
 
Join Date: Mar 2007
Thanks for taking the time to let us know you now have it working. Hope it makes your daily commute more enjoyable.
__________________
If it ain't broke Don't fix it
  Reply With Quote
Old 16th October 2008, 04:04 AM   #12
diyAudio Member
 
tsmith1315's Avatar
 
Join Date: Jul 2003
Location: Doerun, GA
Quote:
Because this is a directional isolator I had to buy two male/male and two female/female RCA plugs to make it work.
I'm curious as to how or why it's directional. Are they stepping up voltage, compensating for transformer loss, or what?

The GLI's we used to get were just 1:1 transformers, as ppia600 described.
__________________
Tim
  Reply With Quote
Old 17th October 2008, 10:52 AM   #13
diyAudio Member
 
Join Date: Mar 2007
I know that they are marked input and output, I know that if you connect them backwards you WILL lose about half of your low frequency output.
__________________
If it ain't broke Don't fix it
  Reply With Quote
Old 17th October 2008, 12:39 PM   #14
ppia600 is offline ppia600  United States
diyAudio Member
 
Join Date: Jun 2007
Location: Louis y ana
Quote:
Originally posted by I Am An Idiot
I know that they are marked input and output, I know that if you connect them backwards you WILL lose about half of your low frequency output.
I think that is only for the ones that aren't 1:1. I remember some being sold that were purposely a different ratio for amp input impedance purposes, can't remember which brands.
__________________
Don't worry... you can always turn the gain down!
  Reply With Quote
Old 17th October 2008, 05:48 PM   #15
djQUAN is offline djQUAN  Philippines
diyAudio Member
 
Join Date: May 2004
Location: manila
Send a message via MSN to djQUAN Send a message via Yahoo to djQUAN
Quote:
Originally posted by tsmith1315


I'm curious as to how or why it's directional. Are they stepping up voltage, compensating for transformer loss, or what?

The GLI's we used to get were just 1:1 transformers, as ppia600 described.

I opened one before and one winding is wired directly to the plugs and the other winding is wired through a DC blocking cap before the plugs. can't remember which one is input and output.
  Reply With Quote
Old 18th October 2008, 01:30 AM   #16
diyAudio Member
 
Join Date: Mar 2007
I opened one up today and just as DJ stated, there is a capacitor in series with the input winding. No capacitor on the output winding. One winding had a DC resistance of 125 ohms. The other read 100 ohms. I forgot to notice which was the higher reading the input or the output. So obviously the ratio is not 1:1, this may explain the reduction in sound that I have noticed. It may have seemed as a reduction in the low frequencies because it was probably on the sub amplifier. It was probably just lowering everything, just could not hear that on a sub setup.
__________________
If it ain't broke Don't fix it
  Reply With Quote
Old 18th October 2008, 04:27 AM   #17
diyAudio Member
 
tsmith1315's Avatar
 
Join Date: Jul 2003
Location: Doerun, GA
Quote:
Originally posted by I Am An Idiot
No capacitor on the output winding. One winding had a DC resistance of 125 ohms. The other read 100 ohms.
From dj's comment, I assume the caps are polarized?

After looking at the link supplied by RdJay, PAC quotes a 1.3dB voltage gain for the GLI. That's reasonable for the resistance you measured.

However, the directionality could be more a function of impedance than gain. Typically, the output impedance of a HU/processor is an order of magnitude less than the input impedance of a processor or amp. The combined LCR Z's of the reversed GLI may not be in a happy place for the input of some amps.

How about the two wires beside the RCA pigtail, what are they for?
__________________
Tim
  Reply With Quote
Old 18th October 2008, 05:33 AM   #18
diyAudio Member
 
Join Date: Mar 2007
Some amplifiers have to see ground on the shield of their input cable in order to operate properly. The 2 brown wires ground the shield of the output cables of the device. 1 wire for each channel.
__________________
If it ain't broke Don't fix it
  Reply With Quote
Old 18th October 2008, 01:45 PM   #19
ppia600 is offline ppia600  United States
diyAudio Member
 
Join Date: Jun 2007
Location: Louis y ana
/\ +1
__________________
Don't worry... you can always turn the gain down!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
adapter? Original Burnedfingers Tubes / Valves 2 11th March 2008 07:33 AM
Adapter or Transformer jdlech Multi-Way 2 16th January 2008 03:40 AM
sot 23-5 to dip 8 adapter biovizier Parts 2 24th July 2005 12:37 PM


New To Site? Need Help?

All times are GMT. The time now is 04:53 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2