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Old 17th August 2005, 01:54 PM   #1
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Default choke

Ihave built a 2a3 amp using one power xformer and choke fro both ch
I want to now build it dual mono. the choke in the origonal design feeding both ch b+ was 10 h 150 MA I know I dont need the same current rating but what about the inductance ?


Jeff
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Old 17th August 2005, 02:13 PM   #2
kmtang is offline kmtang  Canada
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It is better to use same rating of 10H 150mA choke for Mono's too. Lower current rating of choke would have higher internal resistance which is not so good.

I used a BIG 10H 300mA choke stereo 45 amplifier for it's low resistance.

Johnny
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Old 17th August 2005, 05:07 PM   #3
PRR is offline PRR  United States
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On paper, you want a pair of 20H 75mA, and half the capacitance.

But caps are cheap. If you stick with the 2-ch cap value in a 1-ch amp, you could stay with 10H (75mA) or maybe less.

As Johnny says, 10H and 150mA will often run like 15H when only passing 75mA. It isn't very critical, as long as you do NOT exceed the current rating, and the inductance is "close".
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Old 18th August 2005, 01:41 PM   #4
gerd is offline gerd  Germany
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Hello,

better solution is to use chokes with the same losses ( doubled resistance), this gives at the same dimension of every choke a 2 times higher inductivity.
result: 2 times better smothing at the same losses per choke.

My preferred solution: Use one smothing for both channels with two CL-combinations in series, each with an half inductivity/dc-resistance of the original choke, then you will get much better smothing , at the same losses like before.

Gerd
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