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- Nov 17, 2011
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What has the voltage of the power supply to do with the flatness of the audio signal?
The regulator will not be very small either. As you are going for a hifi audio installation, a linear regulator is the preferred choice (unless you are willing to invest in comparatively elaborate filtering which will bring issues of cost and space by itself, in that case a switch mode regulator can be used).
Note that 120 V DC is a potentially lethal voltage. Take any precautions necessary to avoid electrical shock. The capacitor will store dangerous amounts of energy even after the mains supply has been turned off. Provide a bleeder resistor to discharge the capacitor.
You will need a big capacitor for that voltage. The capacity depends on the current you are going to draw from the supply.
The regulator will not be very small either. As you are going for a hifi audio installation, a linear regulator is the preferred choice (unless you are willing to invest in comparatively elaborate filtering which will bring issues of cost and space by itself, in that case a switch mode regulator can be used).
Note that 120 V DC is a potentially lethal voltage. Take any precautions necessary to avoid electrical shock. The capacitor will store dangerous amounts of energy even after the mains supply has been turned off. Provide a bleeder resistor to discharge the capacitor.
Switchmode
It sounds like you are talking about an offline power supply making 160 Vpeak after the rectifiers.
1. The capacitor voltage must be greater than 160 V. 2x the peak voltage is recommended for long-term reliability.
2. Offline supplies are a banned topic. No gigantic power transformer, no help.
ak
1. The capacitor voltage must be greater than 160 V. 2x the peak voltage is recommended for long-term reliability.
2. Offline supplies are a banned topic. No gigantic power transformer, no help.
ak
Can you suggest some linear regulators that i could use for my power supply? I am using the chip LM 4702 as my mosfet for an amplifier.
thank you for the warning at the bottom, i fully understand the dangers of 120v wall power.
you do realise this IC requires a split supply ? your comments so far indicate you don't
so with your stated 120V, I would have to assume that is the total rail to rail voltage ... ie. ... +60V 0V -60V
for those sort of voltages for audio amp gear, regulation isn't a requirement, the supply rails varying a few volts isn't an issue
Dave
so with your stated 120V, I would have to assume that is the total rail to rail voltage ... ie. ... +60V 0V -60V
for those sort of voltages for audio amp gear, regulation isn't a requirement, the supply rails varying a few volts isn't an issue
Dave
i have been busy, sorry for the late reply. did the datasheet say it needs a split supply? i didn't notice. i know the maximum operating voltage is 100 volts. How many volts should i use? I heard my dad say that the higher the voltage, the more likely it will sound better, because of better response. if someone can confirm that is the case, then i'll use something around 80-90v, which a dc power supply is a lot easier to make
Attachments
That chip is not a MOSFET, nor even a MOSFET driver. It is a driver chip for a complementary darlington output stage.
Also, the max voltage allowed is ±100V, but you don't need that much unless you want 600W into an 8Ω speaker.
Bob
