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Old 7th March 2006, 10:24 AM   #1
100db is offline 100db  Thailand
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Default Is a bridge / parallel configuration of 3875 is better for my speaker ?

Hello,

I'm using inverted LM 3875 with 24-0-24 v power supply ( +/- 35v to the pin).

I would like to know if I use bridge or bridge+parallel configuration can make my gain clone drive my speaker better ?

My speaker is Scan 15w-8530 + Vifa XT25, serie XO.
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Old 7th March 2006, 10:38 AM   #2
Bazukaz is offline Bazukaz  Lithuania
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I depends on your loadspeaker's impedance.
35V is quite much for this amp.For this voltage , a bridged config will hardly be usable for any lower loadspeaker impedances than 16Ohms.
You should search for overture design guide excel spreadsheet at www.national.com to get an idea what output powers at known impedance speakers you should expect.

Regards,
Lukas.
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Old 7th March 2006, 04:06 PM   #3
100db is offline 100db  Thailand
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Bridge will make the GC see a speaker as half impedance and parallel will push it back to normal impedance, am I understand correct ?
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Old 7th March 2006, 04:33 PM   #4
sreten is online now sreten  United Kingdom
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Quote:
Originally posted by 100db
Bridge will make the GC see a speaker as half impedance and parallel will push it back to normal impedance, am I understand correct ?
Correct. But how about 3 paralleled bridged pairs ?

/sreten.
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Old 8th March 2006, 02:40 AM   #5
100db is offline 100db  Thailand
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Quote:
Correct. But how about 3 paralleled bridged pairs ?
To make it handle a lower impedance speaker properly ?

This would be very interesting, anybody try this before ?
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Old 8th March 2006, 10:14 AM   #6
Khron is offline Khron  Romania
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Yes, it's been tried before, except it's with 6 LM3886s...

http://www.shine7.com/audio/bpa300.htm
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Old 8th March 2006, 10:40 AM   #7
DIYdo is offline DIYdo  United Kingdom
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From my BPO experiences you don't get the power gains expected. For the extra work load I have found it easier and more practical to use discreet components. Not saying not to try though. Chips are very easy to work with, and are very reliable.
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Old 8th March 2006, 10:42 AM   #8
sreten is online now sreten  United Kingdom
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Quote:
Originally posted by Khron
Yes, it's been tried before, except it's with 6 LM3886s...
http://www.shine7.com/audio/bpa300.htm
Hmm...

Its not 3 paralleled bridged pairs, its a pair of 3 paralleled amplifiers bridged.

/sreten.
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