Any easy way to reduce mains from 122VAC to 110VAC? - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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 20th November 2014, 04:14 PM   #1
john65b is offline john65b  United States
diyAudio Member
 
john65b's Avatar
 
Join Date: Jan 2005
Location: Chicago
Default Any easy way to reduce mains from 122VAC to 110VAC?

Hey all, I have an ICEPower Module that will not turn on (sense) unless mains voltage is less than 110VAC. I have measured the mains here and I am around 122VAC.

I was troubleshooting the module and put it on a Variac. I noticed as soon as I got under 110VAC (min voltage for module is 85 VAC), the module ran perfectly. Also, once it is turned on, it ran fine on mains voltage of 122VAC.

I have put in a Current limiter (CL-90 - 120 ohm resistance), and didn't really help - I think it needs more Amps to get that ramp up in resistance / voltage to drop mains a bit.

Any other way?

By the way, this is an ICEPower 50ASX2 that has an internal SMPS onboard....
__________________
All right, but apart from the sanitation, medicine, education, wine, public order, irrigation, roads, the fresh water system and public health, what have the Romans ever done for us? Life of Brian

Last edited by john65b; 20th November 2014 at 04:17 PM.
  Reply With Quote
Old 20th November 2014, 04:22 PM   #2
diyAudio Member
 
Join Date: Mar 2002
Location: Glasgow
How about RG Keen's Vintage Voltage adaptor Vintage Voltage Adapter
__________________
"Sadly, audio is like that. It is about the only branch of electronic engineering where lack of knowledge is regarded as a more advanced form of wisdom." http://scopeboy.com/amps
  Reply With Quote
Old 20th November 2014, 04:34 PM   #3
john65b is offline john65b  United States
diyAudio Member
 
john65b's Avatar
 
Join Date: Jan 2005
Location: Chicago
That looks interesting - I have a 120 / 12 tranny - may be a bit too big to fit in teh chassis tho...I will have to check.
__________________
All right, but apart from the sanitation, medicine, education, wine, public order, irrigation, roads, the fresh water system and public health, what have the Romans ever done for us? Life of Brian
  Reply With Quote
Old 20th November 2014, 04:37 PM   #4
Elvee is offline Elvee  Belgium
diyAudio Member
 
Elvee's Avatar
 
Join Date: Sep 2006
Quote:
Originally Posted by john65b View Post

Any other way?
The simplest and most effective way is to use a low voltage transformer wired as an autotransformer.
In your case, a 120V/12V would do: since the regulation will work backwards, you'll get something like 116~118V with 122V input.
The power only needs to be the percentage of the voltage drop you need times the nominal power of your amplifier, ~10% in your case
__________________
. .Circlophone your life !!!! . .
♫♪ My little cheap Circlophone© ♫♪
  Reply With Quote
Old 20th November 2014, 04:53 PM   #5
cspirou is offline cspirou  France
diyAudio Member
 
Join Date: Aug 2014
Blog Entries: 3
If you only need to drop 12 volts I would think that the simplest way would be to make a voltage divider with a couple of resistors.

Voltage divider - Wikipedia, the free encyclopedia

You wants your resistors to be lower then the equivalent resistance of the module but too low and they'll dissipate a lot of heat. How many watts is the ICEPower module?
  Reply With Quote
Old 20th November 2014, 05:05 PM   #6
diyAudio Member
 
Join Date: Nov 2008
Location: Oakmont PA
Elvee almost has it. Use a 120 to 12 volt transformer, wire the primary across the input voltage, place the secondary in series with the voltage to your power module. if you connect the secondary one way it will add 12 volts, the other it will subtract it. You only need a transformer with a secondary current rating equal to the final draw.
  Reply With Quote
Old 20th November 2014, 05:16 PM   #7
john65b is offline john65b  United States
diyAudio Member
 
john65b's Avatar
 
Join Date: Jan 2005
Location: Chicago
Quote:
You wants your resistors to be lower then the equivalent resistance of the module but too low and they'll dissipate a lot of heat. How many watts is the ICEPower module?
The Icepower amp is listed at 65 watts.
__________________
All right, but apart from the sanitation, medicine, education, wine, public order, irrigation, roads, the fresh water system and public health, what have the Romans ever done for us? Life of Brian
  Reply With Quote
Old 20th November 2014, 05:18 PM   #8
diyAudio Member
 
zigzagflux's Avatar
 
Join Date: Oct 2006
Location: Charlotte, NC
Agreed, autotransformer is the way to go. Only slight change I would suggest would be to wire 120V and 12V windings in series with same relative polarity, then connect your line voltage to the entire winding, which will now be rated for 132V. You are placing fewer volts/turn on the transformer, which will allow it to run at lower saturation given your 122V input. Output will be around 110V, taken across the 120V winding.
  Reply With Quote
Old 20th November 2014, 06:00 PM   #9
Nisbeth is offline Nisbeth  Denmark
diyAudio Member
 
Nisbeth's Avatar
 
Join Date: Jan 2001
Location: Denmark
Quite weird that this should be a problem since the ICEpower SMPS is rated up to 132VAC (264VAC doubled). 122VAC should be well within range?

/U.
__________________
DIY projects blog
  Reply With Quote
Old 20th November 2014, 06:02 PM   #10
diyAudio Member
 
Join Date: Apr 2003
Location: Eastern Pennsylvania
I would first contact ICE about the issue. It may be possible to easily adjust the over-voltage trip point of your modules to accept up to 125 volts without damage. That would be both the least costly and the most convienent solution of possible.
__________________
Ken
  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
12vDC to 110vAC converter with 18v battery DarpMalone Power Supplies 0 20th July 2013 12:11 AM
DIY Mains conditioning Power bar (Mains DC, and Mains voltage) cjmurphy87 Power Supplies 10 18th April 2013 12:44 AM
Easy Way To Reduce 251V to 235V? coit Tubes / Valves 4 21st September 2010 06:53 AM
Do mains RCD's reduce dynamics? nad Everything Else 4 1st February 2010 09:59 PM
Is there any easy way to design a center channel that will match my Polk mains? mikejz84 Multi-Way 6 18th July 2003 12:03 AM


New To Site? Need Help?

All times are GMT. The time now is 01:29 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright ©1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2