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Old 26th March 2008, 03:56 PM   #1
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Default Help with BTL power requirements

I have four small power amp modules I built some years ago for a project that I dropped and didnít complete. Iíve never built a BTL amp before, so I thought these would be good candidates to experiment with. I know the power requirements for them (single module, mono), how do I figure the requirements if I BTL two together. I canít find anything in any book on my shelf or on the net? HELP! Any suggestions or point me to an article. Thanks.
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Old 26th March 2008, 04:25 PM   #2
AndrewT is online now AndrewT  Scotland
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bridged gives double the power into double the impedance.
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Old 26th March 2008, 08:43 PM   #3
sreten is offline sreten  United Kingdom
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or double the power of the single channel into half the nominal
load, when connecting the nominal load to two bridged channels.

/sreten.
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Old 27th March 2008, 05:31 PM   #4
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Default Let me restate question...

Thanks for the replies, but I think I might not have been clear in my question. I know how much output (theoretical) power should be. What I am trying to find is a formula to figure power supply needs. I know the voltage and current needed for one module (mono, single ended), how much is needed for two modules in BTL, that is the formula I havenít been able to find. Thanks.
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Old 27th March 2008, 05:46 PM   #5
sreten is offline sreten  United Kingdom
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Hi,

BTL has the same power requirements as the two separate channels
into half the load connected, i.e. for an 8 ohm load it is the same as
for two channels into 4 ohms.

Generally speaking small amplifiers are not good into low impedances
and are therefore not suitable for a BTL amplifier unless the load
impedance is unusually high.

/sreten.
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Old 28th March 2008, 11:45 AM   #6
AndrewT is online now AndrewT  Scotland
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Hi,
if you know the power and smoothing requirement for a single amp then the power AND smoothing requirement will go up roughly 4times.
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