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Old 16th August 2005, 08:06 PM   #1
diyAudio Member
Join Date: Aug 2005
Default Autocostuire Fenice 20a

Hi there,

I'm very new to class D amps having recently bought a T-amp.

I've decided to try the air cored output inductor version and bought a Autocostuire Fenice 20a.

The amp arrived promptly and in good order however there are some components missing, C31, C32 & C27 & C28. I emailed Autocostuire and was informed this was right, however, C27 & C28 are on the output of the 2024 and the output components appear to be mirror imaged between channels. The other channel has the equivalent components, C29 & C30, in situ, this therefore seems odd.

Does anyone else have this amp and is this OK?, I don't want to play with the amp or power it up since I may have to return it.

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Old 24th August 2005, 03:21 PM   #2
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Location: Helsinki
I just got one and C27&c28 are missing. That can't be right. And now the Fenice 20a has disappeared from autocostruire's pages.
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Old 24th August 2005, 04:37 PM   #3
ac2005 is offline ac2005  Hong Kong
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Join Date: Jul 2005
Location: HK
I don't have Fenice 20a but I have the other one TA2020 version. 4 caps are missing on my pcb and it's right. Those empty spaces are left for you to add caps to optimize your kit for your speakers of different impedences. The original kit, optimized for 6 ohm speakers, includes 4 0.33uF caps. You can add 4 0.22uF caps to those empty spaces to optimize the kit for a pair of 4 ohm speakers.

I am not sure if Fenice 20a is the same case. But I think probably so.
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Old 24th August 2005, 07:43 PM   #4
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Location: Helsinki
The amp seems to play ok, so maybe the two caps really are missing on purpose. The purpose being limited space, because of those oversized air cores. If I only had means of measuring the caps, they might be .44 on the missing side and 2x.22 on the full side.
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Old 27th August 2005, 06:40 PM   #5
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Join Date: Aug 2005
Default C27 & C28 Values

Thanks for the replies.

Autocosture very kindly sent me a copy of the circuit diagram, C27, 28, 29 & 30 are all 1uF in value.

I'll power up & try it.

I've built it into the case of a "dead" Quad 33 Control Unit along with a switched attenuator.

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