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Old 5th January 2006, 03:43 PM   #1
fity is offline fity  Spain
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Default desing +/- 70v 5A power supply

first excuse me for my english.
I need a desing of +/- 70v 5A power supply for a power amplifier.
I have a toroidal transformer 50+50v . may be help me? filtred and if posible regulated.
thanks
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Old 5th January 2006, 04:21 PM   #2
edl is offline edl  Hungary
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Hi,

regulated won't works, the sec voltage of the trafo is too low, you may need 2*60-70V for that. Anyway regulated voltage is not needed to feed an amp in most cases.

So you need a 25A graetz-bridge, and two 10000uF/80V cap. That's all.
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Old 9th January 2006, 01:35 PM   #3
fity is offline fity  Spain
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is better to put 4 x 4700uf 80v caps? or more.
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Old 9th January 2006, 02:39 PM   #4
Eva is offline Eva  Spain
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Using more capacitance reduces voltage ripple. On the other hand, using more capacitors of a smaller value (yielding the same total capacitance) may sometimes improve performance if the combination produces less ESR and ESL (equivalent series resistance and inductance) or features a higher total ripple current rating in comparison with a single capacitor.
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Old 10th January 2006, 07:25 AM   #5
fity is offline fity  Spain
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is this a good desing of power supply for power amp?
is too big the capacitance of caps than the only 10000uf ?
anything changes in this desing?
i need help
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Old 14th April 2012, 01:13 PM   #6
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if it is a Class D amplifier then i believe that you need a very very solid power rail supplying it....so you will need a power supply that can give you +/-70V with no more than say 300mV maximum undershoot or overshoot after a no-load to full-load transient and full-load to no-load transient.
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Old 14th April 2012, 10:35 PM   #7
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fity, a 500 VA transformer is too low a power, if you intend to operate the supply with a continuous load of 5 amps. Further, the RMS currents in the transformers secondaries will be far greater than 5 amps RMS.
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Old 15th April 2012, 05:14 PM   #8
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if its class d then theres no way itll be drawing 5A continuously.

However, as mentioned class d needs well regulated rails with little over/undershoot, so you will need more than what your trafo can give, as the other contributors said.

.....see my simulation of a class d amplifier in the class d forum to see how the class d draws power..posted today
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Old 15th April 2012, 07:34 PM   #9
RJM1 is offline RJM1  United States
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You do know this is a 6 year old thread.
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Old 15th April 2012, 07:36 PM   #10
oiphy is offline oiphy  Norway
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hehe..... made my day lol
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