Hi everyone, i could do with some advice i have two p101 amps
that have Lateral Mosfets as outputs two of each n & p channel.
I built Maplin amps that used these Mosfet's quite a few years ago and it stated not to exceed 56volts.
The p101 boards state that around 70volts can be used.
I have a power supply from an old Yamaha amp which i would like to use which has outputs of +84volt & -84volt, would it be possible to use this with these Mosfets?.
Any advice would be greatly welcome thanks.
that have Lateral Mosfets as outputs two of each n & p channel.
I built Maplin amps that used these Mosfet's quite a few years ago and it stated not to exceed 56volts.
The p101 boards state that around 70volts can be used.
I have a power supply from an old Yamaha amp which i would like to use which has outputs of +84volt & -84volt, would it be possible to use this with these Mosfets?.
Any advice would be greatly welcome thanks.
Hello Mick!
It would be much easier to know for sure if you tell us which Mosfets you mean. Some power FETs can take up to 180 volts, so your 84 volt supply would be ok as the voltage across the FET can reach double that amount. (if we don´t take into consideration any spiked induced by inductive loads)
It would be much easier to know for sure if you tell us which Mosfets you mean. Some power FETs can take up to 180 volts, so your 84 volt supply would be ok as the voltage across the FET can reach double that amount. (if we don´t take into consideration any spiked induced by inductive loads)
With those kind of rails you need to be looking at 3 minimum, 4 ideally pairs of output devices. The voltage of the output devices is not so much the issue, it's the current and power that such high rails will bring.
Although those Exicon devices you have are only rated to 160V anyway, so your 84V rails would be too much.
Although those Exicon devices you have are only rated to 160V anyway, so your 84V rails would be too much.
300VA would be a bit feeble to run a pair of boards as you'd be pushing over 200W into a 4 ohm load each one. It would be perfect for a single board running 4 ohms or both boards running an 8 ohm load.
Bridging running those rails you would be limited to an 8 ohm load, although you would still run into supply collapse problems as with running 2x 4 ohm loads above. Bridging should use one supply really.
Bridging running those rails you would be limited to an 8 ohm load, although you would still run into supply collapse problems as with running 2x 4 ohm loads above. Bridging should use one supply really.
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