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Old 1st October 2008, 12:11 AM   #1
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Default how to briged 2x ucd400hg

hi all ive got 4x ucd 400 hg modules and would like to bridge them to make a 2x 800w stereo amplifier

ive read on this forum that it can be done but i cant find it by searching

can anyone offer any advice on how to do it

cheers
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Old 1st October 2008, 12:42 AM   #2
BWRX is offline BWRX  United States
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The UcD modules have a differential input, so you just reverse the input connections on one module and connect the speaker to the output of each module. There is a way to synchronize the switching frequencies of each module but I don't believe it is necessary and I can't remember which thread it was in. It may even be in the literature on the hypex website.
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Old 1st October 2008, 04:09 AM   #3
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hi mate
cheers
so just to clarify all i need to do is reverse the polarity on the input + and- on one of the modules and then run the speaker hot and cold from both modules to the speaker terninals as per normal
exept that both modules outputs will be connected to the same pair of binding posts in parallel
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Old 1st October 2008, 05:59 AM   #4
kstrain is offline kstrain  Scotland
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Quote:
Originally posted by slr 5000
hi mate
cheers
so just to clarify all i need to do is reverse the polarity on the input + and- on one of the modules and then run the speaker hot and cold from both modules to the speaker terninals as per normal
exept that both modules outputs will be connected to the same pair of binding posts in parallel
NO! You have the input side correct but it reads as if you have the output wrong.

The amplifiers are single ended so the "-" output is just ground. It is not used on either amplifier in bridge configuration.

The "+" signal to the speaker is connected to the "+" output of the amplifier with its inputs the "right way round". (So it gives the normal signal at its output.)

The "-" signal to the speaker is connected to the "+" output of the amplifier with its inputs inverted. (So it gives the opposite signal at its output.)

Note that for a given voltage out each amplifier is providing twice the current that it would normally, so the minimum load impedance is doubled.

Ken
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Old 2nd October 2008, 09:08 AM   #5
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thanks
i think i have it now so the speaker cold on each module is no longer used
i just use the + from one module to the + of the speaker and the + of the other inverted module to the - of the speaker
i presume the power supply to the boards still gets connected as per normal
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