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Old 8th October 2007, 11:40 PM   #1
diyAudio Member
Join Date: Dec 2003
Location: brussels
Default monica2 usb and smps -12 /+12v

hello everybody,

i have a monica usb, and i would like to know if i can attach an smps with a -12 /12 v supply. i have red that with more than 12v monica is better, even up to 24v.

i have just found out that my smps can do that. it is a 100w smps. it can sink 1 amp in -12v.

so if i connect +12 to the positive and the -12 to the 0, what would happen then ? a big blow and some smoke , or just fine sound ?

thanx a lot
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Old 10th October 2007, 02:05 PM   #2
diyAudio Member
Join Date: Oct 2007
I have USB Monica also. And there is nothing happen if I attach the lady to +12 / -12 VDC. But the best range is 15 to 18 VDC. The sound will be more harsh and harsh if I load it with 24 VDC since the LM 317 power regulator temperatur rise significantly. So if you try to use 24 VDC please attach the heat sink to the LM 317.

I think TDA 1545 have weakness in higher temperatur.

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Old 11th October 2007, 12:16 AM   #3
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Join Date: Dec 2003
Location: brussels
so it will work with the -12/12 volt ? or will it do nothing ?

maybe i can build somthing to get the 24 volt to 18 but will 1 amp be enough to get the glorie of monica ? or does she needs more than 1 amp ?

i can attach a huge heatsink to the lm317, that wouldn't be a problem at all. but the sound is more inportant.

oh yeah: if i connect the + of monica at 5v and i connect the zero at -12: then i'm at 17 volt. could work don't you think ?

ps: what outcap do you use, cause i have hear that the black gates aren't that good in that place? i wonder if anyone has disconnect one of the black gates and made a super e cap with the other. and then compared one channel with the super e cap and the other with something like a film cap or so ?
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Old 11th October 2007, 03:15 PM   #4
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Join Date: Feb 2001
Location: Vancouver, B.C., Canada
Hanyaboy, what voltage did you settle on for your Monica? If higher than 12 volt did you make any changes to components on the board?

then_dude, AFAIK Monica is designed to use a 12 volt supply and I have been running her on a 12 volt SMPS with no problem.

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Old 11th October 2007, 04:33 PM   #5
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Join Date: Dec 2003
Location: brussels
i know that monica is desinged to run at 12v;

but the monica USB sounds better with 18v;

you have to adjust the trimpots to make shure you have 1/2 off Vinput.
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