Yamaha MG166c Mixer. at DVinfo.net

Bob Hart · September 13th, 2011, 04:37 AM

This appliance runs off mains power via a 18v 1.2amp cabled transformer pack which supplies via a proprietory plug in the back of the mixer. I have found nothing to indicate if the transformer output is 18vAC or 18vDC.

I am examining the possibility of running it off battery power. If the output is 18vAC, then there is a possibility that the mixer might happily operate on AB or V-Mount DC power of 12-14vDC.

Is anyone doing this.

Any advice will be greatly appreciated on whether the 12-14vDC power can be applied via the 18V socket through the internal rectifier which would be there if the input power is 18vAC.

Gary Nattrass · September 13th, 2011, 05:23 AM

Hi Bob I have the Yamaha MG 12/4 mixer and the psu has output AC17.5VX2 0.94A written on it so I would assume yours is of similar spec.

Hope this helps and not sure if you could run these off batteries, I tend to use the behringer 1002b if I need a battery mixer or the new twelco ones I have just bought.

Gerry Gallegos · September 13th, 2011, 07:25 AM

According to Yamaha tech page it runs of 35VCT utilizing power supply PA-30 AC adapter.

http://www.yamahaproaudio.com/downlo..._datasheet.pdf

perhaps yours is different.

Good luck

Bob Hart · September 13th, 2011, 02:00 PM

Thank you Gary and Gerry for your responses. I had been told a long time ago that I could apply DC of about 2/3 of the voltage to the AC input of another unrelated appliance and the the appliance would run as the DC would pass through the rectifier without harming things. If anyone has anything furthur your advice will be most welcome.

Greg Miller · September 14th, 2011, 01:03 AM

In theory, you might be able to connect a DC supply in place of the AC transformer. However, figuring out the correct DC voltage is a bit tricky.

To be safe, you'd really want to consult a schematic of the mixer's internal power circuitry.

For example, although the AC transformer is a center tapped type, you don't know whether it's really used internally with a center tapped configuration. It might be used in a dual-voltage configuration, with one of the transformer end windings connected to mixer ground (not the most common supply, but a possibility nevertheless).

If you don't have access to the schematic, or don't understand the various power supply configurations, you could easily get into trouble.

September 13th, 2011, 04:37 AM	#1
Bob Hart Inner Circle Join Date: Dec 2003 Location: PERTH. W.A. AUSTRALIA. Posts: 4,477	Yamaha MG166c Mixer. This appliance runs off mains power via a 18v 1.2amp cabled transformer pack which supplies via a proprietory plug in the back of the mixer. I have found nothing to indicate if the transformer output is 18vAC or 18vDC. I am examining the possibility of running it off battery power. If the output is 18vAC, then there is a possibility that the mixer might happily operate on AB or V-Mount DC power of 12-14vDC. Is anyone doing this. Any advice will be greatly appreciated on whether the 12-14vDC power can be applied via the 18V socket through the internal rectifier which would be there if the input power is 18vAC.

September 13th, 2011, 05:23 AM	#2
Gary Nattrass Trustee Join Date: Apr 2008 Location: Cornsay Durham UK Posts: 1,992	Re: Yamaha MG166c Mixer. Hi Bob I have the Yamaha MG 12/4 mixer and the psu has output AC17.5VX2 0.94A written on it so I would assume yours is of similar spec. Hope this helps and not sure if you could run these off batteries, I tend to use the behringer 1002b if I need a battery mixer or the new twelco ones I have just bought. __________________ Over 15 minutes in Broadcast Film and TV production: http://www.imdb.com/name/nm1044352/

September 13th, 2011, 07:25 AM	#3
Gerry Gallegos Major Player Join Date: Oct 2007 Location: Houston, Texas Posts: 262	Re: Yamaha MG166c Mixer. According to Yamaha tech page it runs of 35VCT utilizing power supply PA-30 AC adapter. http://www.yamahaproaudio.com/downlo..._datasheet.pdf perhaps yours is different. Good luck

September 13th, 2011, 02:00 PM	#4
Bob Hart Inner Circle Join Date: Dec 2003 Location: PERTH. W.A. AUSTRALIA. Posts: 4,477	Re: Yamaha MG166c Mixer. Thank you Gary and Gerry for your responses. I had been told a long time ago that I could apply DC of about 2/3 of the voltage to the AC input of another unrelated appliance and the the appliance would run as the DC would pass through the rectifier without harming things. If anyone has anything furthur your advice will be most welcome.

September 14th, 2011, 01:03 AM	#5
Greg Miller Trustee Join Date: Jan 2011 Location: Pennsylvania Posts: 1,791	Re: Yamaha MG166c Mixer. In theory, you might be able to connect a DC supply in place of the AC transformer. However, figuring out the correct DC voltage is a bit tricky. To be safe, you'd really want to consult a schematic of the mixer's internal power circuitry. For example, although the AC transformer is a center tapped type, you don't know whether it's really used internally with a center tapped configuration. It might be used in a dual-voltage configuration, with one of the transformer end windings connected to mixer ground (not the most common supply, but a possibility nevertheless). If you don't have access to the schematic, or don't understand the various power supply configurations, you could easily get into trouble.