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Old 7th September 2011, 01:35 PM   #101
ljm_ljm is offline ljm_ljm  China
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INPUT CAP IS 22 UF.
It was close to position, INPUT +
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Old 12th September 2011, 12:33 PM   #102
khjen is offline khjen  Singapore
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Default L15D vs L20D

Hi LJM

Can you comment on differences between L15D and L20D - in construction material and sound quality.

Thanks.
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Old 12th September 2011, 01:08 PM   #103
Bernie7 is offline Bernie7  Singapore
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Hi ljm

Input impedance of L20D = Rin = 3.3K which is too low for me.

If I change it to 20K and increase Rfb so that the Gain remains the same, will there by any issue like degradation in sound quality?

Which resistor is Rfb?
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Old 13th September 2011, 01:40 PM   #104
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by khjen View Post
Hi LJM

Can you comment on differences between L15D and L20D - in construction material and sound quality.

Thanks.
Hello.

About L15D, L20D the main difference is that their power supply, voltage, power. This several

L15D work recommend is +-45 to 60 V + V
L20D work is recommended to + +-60 V-75 V

Their effects distinction is not particularly big.
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Old 13th September 2011, 01:44 PM   #105
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by Bernie7 View Post
Hi ljm

Input impedance of L20D = Rin = 3.3K which is too low for me.

If I change it to 20K and increase Rfb so that the Gain remains the same, will there by any issue like degradation in sound quality?

Which resistor is Rfb?

Hello, you can't change this only resistance.

Because he will affect the switch frequency.
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Old 13th September 2011, 01:48 PM   #106
ljm_ljm is offline ljm_ljm  China
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ARC DSI 200

The L20D with similar structure.

IRS2092 + (IRF4020 speculation)
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Old 14th September 2011, 10:30 PM   #107
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I got these boards yesterday and have been listening to them every time I get a break. My fear of them not handling 4 ohms is gone after playing them fairly loud for about 1 hour. They only get warm to the touch but I'm not using all the power these can produce. With a small fan they're cold like a corpse.
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Old 14th September 2011, 10:32 PM   #108
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Nice What rail voltage are you running?
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Old 14th September 2011, 10:42 PM   #109
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Quote:
Originally Posted by rickedd46 View Post

My fear of them not handling 4 ohms is gone after playing them fairly loud for about 1 hour. They only get warm to the touch but I'm not using all the power these can produce. With a small fan they're cold like a corpse.
So long as the switching frequency isnt too high and the deadtime is correct they shouldnt run hot. Obviously the heatsink comes into the equation too.

I run an irs2092 into 2 ohms at 750watts without any trouble.
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Old 14th September 2011, 10:44 PM   #110
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Isnt the output device irf4020 a major factor in the output??
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