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Old 15th April 2006, 04:34 PM   #1
pwan is online now pwan  United Kingdom
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Default 100W amp: Leach amp or P101 ?

Hello,


I currently have 40-0-40 480VA and 6x 6800UF, I wonder which one ( Low-tim Leach amp, and P101) is suitable for my 88 db/w/m speaker and classic/pop music?

Thanks.
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Old 15th April 2006, 05:20 PM   #2
Leolabs is offline Leolabs  Malaysia
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Depend on your DIY experience.
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Old 16th April 2006, 04:06 AM   #3
pwan is online now pwan  United Kingdom
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Quote:
Originally posted by Leolabs
Depend on your DIY experience.
P101 seems to be simpler, however, I found Leach kit available at reasonable price. As far as sonically concerns, which one is your recommendation?
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Old 16th April 2006, 07:50 AM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
you are short of smoothing capacitance.
You will need a minimum of +-10mF/channel for 8ohm speakers. i.e. 4off 10mF or 8off 6m8F
If you have 4ohm speakers, you need to double the minimum requirement. This will also apply to 4 to 8 ohm speakers since it is the bass unit that tends to be the 4ohm part. 4ohm bass units need 8off 10mF or 12off 6m8F.

There are three ways to arrive at smoothing caps:
1. 2mF/Apk output current. (based on nominal impedance or DCR)
2. 1mF/10W output power. (40Vac will give about 140W)
3. PSU RC time constant >1.4*NFB>1.4*input hiPass. (aim for 1 to 2Hz on 4r or 8r)
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Old 16th April 2006, 11:26 AM   #5
pwan is online now pwan  United Kingdom
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Quote:
Originally posted by AndrewT
Hi,
you are short of smoothing capacitance.
You will need a minimum of +-10mF/channel for 8ohm speakers. i.e. 4off 10mF or 8off 6m8F
If you have 4ohm speakers, you need to double the minimum requirement. This will also apply to 4 to 8 ohm speakers since it is the bass unit that tends to be the 4ohm part. 4ohm bass units need 8off 10mF or 12off 6m8F.

My friend just offer to trade his 4x 10,000UF 63V with my 4x 6,800UF 80V. With 40-0-40 transfer produce ~ 58Vdc, Is it safe to use with 63V cap?
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Old 16th April 2006, 11:38 AM   #6
AndrewT is offline AndrewT  Scotland
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Hi,
allowing +5% for transformer regulation and a further +-6% for mains supply variation brings 40Vac right up to the 63Vdc limit.

So the answer is yes, use 63Vdc on 40Vac.

That gets you in the ballpark of about 130W to 140W into 8ohm.
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Old 16th April 2006, 12:50 PM   #7
pwan is online now pwan  United Kingdom
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I see. I will use 4x 10,000UF 63V for 40-0-40Vac traf then

Andrew, Many thanks.!
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Old 16th April 2006, 03:43 PM   #8
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Actually Rod Elliot recomends 6X4700uf 80V for the P101.

I asked him when building mine if using 6X15000 whould improve things and he told me no. I used them anyway since that is what I had.

I think the Leach is a little more HiFi sounding than the P101 but it needs more heatsink than the P101. At least mine does.

Link to the PSU schematic at the bottom of the page.

Blessings, Terry
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Old 16th April 2006, 04:12 PM   #9
pwan is online now pwan  United Kingdom
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still4given,

Thanks for your comment. BTW, you might consider removing the schematic above as it's Rod's intelectual property. :-)

PS: I sending you an email. Could you check it out? Thanks.
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Old 16th April 2006, 05:37 PM   #10
djk is offline djk
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"you might consider removing the schematic above as it's intelectual property"

Looks like any other power supply to me.
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