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Old 1st August 2003, 10:47 AM   #11
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Thumbs up toohighvoltage...

you could also regulate the voltage down.....just like pejda and dickman did....!
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Old 1st August 2003, 11:45 AM   #12
Nuuk is offline Nuuk  United Kingdom
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Quote:
you could also regulate the voltage down.....just like pejda and dickman did....!
Easier to do if you have dual secondary windings on the transformer!
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Old 1st August 2003, 04:44 PM   #13
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Old 2nd August 2003, 04:23 AM   #14
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so how many amps would one channel draw?
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Old 2nd August 2003, 09:34 AM   #15
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5 amps....nominel (highest), i don't know if peaks are higher.
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Old 2nd August 2003, 12:30 PM   #16
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tbla

I believe the amount of current drawn by the LM3875 is around 500mA on a 4 ohm speaker impedence. With more efficient speakers, it will be less. Where did you get the 5A number?
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Old 2nd August 2003, 04:33 PM   #17
moamps is offline moamps  Croatia
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Originally posted by yldouright
tbla
I believe the amount of current drawn by the LM3875 is around 500mA on a 4 ohm speaker impedence. With more efficient speakers, it will be less. Where did you get the 5A number?
Hi,

For LM3875 max. peak power on 8R load is 100W. This means Ipeak=ca 3,5A from PS for one channel.
For I=0,5A you can get only ca 1W on 4ohm.

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Old 2nd August 2003, 05:39 PM   #18
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moamps

Your example does not apply to the typical gainclone referred to in these forums but even if we accept that a person intends to build a single chip 100W for an 8 ohm speaker, I would not listen to anything that would draw a sustained 100W from this Class B amp

Most people use transformers that are too big for gainclones and IMHO probably degrade the sonics by doing so. Bigger is not always better.
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Old 2nd August 2003, 05:50 PM   #19
moamps is offline moamps  Croatia
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Quote:
Originally posted by yldouright
Most people use transformers that are too big for gainclones and IMHO probably degrade the sonics by doing so. Bigger is not always better. [/B]
Hi,

Maybe yes, maybe not. Bigger transformer gives to you better dynamicaly response and higher overall headroom. IMHO

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Old 2nd August 2003, 06:07 PM   #20
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Talking Bigger is not always better.

statement from those with small d....

i have never heard a bigger trafo decrease sound....
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