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Old 8th November 2001, 02:42 PM   #1
cjunk is offline cjunk  Italy
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I would like to build a 10 watt SoZ, and suggestions to build the PSU are welcome.

1) Is a 450 VA transformer with 18 V secondaries appropriate for one channel (or 900 VA for both)?

2) How big the caps should be? For example 4 high ripple/low esr caps of 10,000 uF are enough?

3) I am going to wind my own air core inductors because I am not able to find anything capable to carry 3 amps. Any suggestion for the shape (e.g. a solenoid) or for the copper wire gauge?
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Old 8th November 2001, 05:31 PM   #2
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Refering to the graphs, a 10W SOZ comes to >200W or so, a 450VA/ch should be fine.As for the caps, my preference is four of the 10000uf per rail. Do check out Parts Connection's catalog for their 12 AWG air cored inductors.
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Old 9th November 2001, 11:29 PM   #3
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18V 2ndaries won't get you 10 watts. After rectification you might get 5 watts output. 400VA with 18V 2ndaries is perfect. But if you want 10 watts output, you need a much higher voltage transformer.

I find the graph shouldn't be strictly read to get a VA rating for the transformer. The speaker load is dynamic so at times when the SoZ sees a 4 ohm load - the wattage can double down and therfore, the draw of the power supply will want to double down. So I normally choose a figure TWICE of what is shown in the graph.
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Old 10th November 2001, 11:19 AM   #4
cjunk is offline cjunk  Italy
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Originally posted by Super_BQ
But if you want 10 watts output, you need a much higher voltage transformer.
How much? What about a 500 VA / 25 V sec. transformer?
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Old 10th November 2001, 11:32 AM   #5
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Originally posted by cjunk
[/B]What about a 500 VA / 25 V sec. transformer? [/B]
That should be fine so long as the house wiring doesnt load down too much or the local substation doesnt supply flaky power ....... either of these could cause that 25V to drop substantially in which case it would not give 10W output. if this is the case, 2 x 30V secondaries should provide enough head room.
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