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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Norway on July 18, 2008, 09:06:15 PM
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Anybody knows what the powerconsumption is for the minimig? i have a ac dc adaptor that has 4 wats outputpower at 4,5 volts. can i use it? the centerpin is positiv.
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@Norway
I use this Power Supply (http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=164101).
Mike
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thank you, mine is 4,5 volts. but the huge 20w powersuply i got from amigakit was also set at 4,5v. i am going to put that beast aside now. :-)
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@Firedawg
Works good for you on your minimig?
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I use a variable output PSU on my Minimig set at 4.5v and it works fine.
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Minimig needs max. 150-200mA without PS/2 components.
With keyboard and mouse the PSU should provide at least stable 500mA. 1A and more are just for reserve and additional stabilizing.
Maximum power consume (200mA) is for about 1.5 sec while the FPGA is "booting". After uploading the firmware (minimig1.bin) the FPGA will internaly checksum the uploaded binary. this takes more power then normal operating but just for a short time.
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I still need to get a shaver adapter for mine. It arrived months ago and has still never been used.
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alexh wrote:
I still need to get a shaver adapter for mine. It arrived months ago and has still never been used.
Dont you have any other PSU for test? I also have one from an d-link router, it provides same polarity and voltage (5V) with the same plug into minimig.
In any case please check the polarity and output voltage at least once bevore plugging in! A bit too much or too little voltage will not directly harm but surtenly a negative polarity will.
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My MiniMig is on loan from Acube. I wouldn't want to blow it up.
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@anybody
Make sure that the power supply is regulated, so that you don't push excess volts in there. Unregulated supplies can easily rise to 50% or more above the "rated" level when the current being drawn is small. You might even consider using some batteries instead of a mains converter.
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The board itself don't have 3.3 and 5V regulators? :-?
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rkauer wrote:
The board itself don't have 3.3 and 5V regulators? :-?
The board has regulators for 3.3, 2.5 and 1.25 Volts. The 5V from input are for the blue LED and to directly supply both PS/2 and joystick ports. All the other components on minimig are working at 3.3V. The FPGA is internaly working at 2.5 and 1.25V.
There are capacitor to stable voltages but the 5V source must also be stable enough to let minimig work fine.
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Just got my two minimigs from the Amigakit store. Just to be on the safe side i ordered two power supplies for them. What was actually in the box however was two of those big unregulated "universal" type AC adaptors with the voltage and polarity glue-gunned to the appropriate settings. :(
Basically this means i'll be putting unregulated (approximated) 5v directly from the mains into the minimig. The house where i live is 70 years old and i'm not sure if i even dare to power the minimig without a regulated power supply.
Now i must come off sounding like a complete {bleep} here but what i'm wondering is what kind of fluctuations is the minimig able to handle if i use this power supply from amigakit?
Thanks.
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I dont know this PSU from Amigakit, but if this is a normal AC adapter it can handle some fluctuations in AC part. All this AC adapter do have some regulation and capacitor to support stable output voltages.
Minimig just need about a maximum of 200mA without PS/2 components. That is very few current and even with PS/2 the PSU easily should handle it :-)
Else many other ppl with Amigakit PSU should report problems. Until now I dont read anything about that.
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I'm using the AmigaKit UK PSU with a US adapter. In the couple of months I've had it there hasn't been any issues.
Bob
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boing4000 wrote:
Minimig needs max. 150-200mA without PS/2 components.
With keyboard and mouse the PSU should provide at least stable 500mA. 1A and more are just for reserve and additional stabilizing.
Maximum power consume (200mA) is for about 1.5 sec while the FPGA is "booting". After uploading the firmware (minimig1.bin) the FPGA will internaly checksum the uploaded binary. this takes more power then normal operating but just for a short time.
That seems like a bit high? From Acube:
[color=ff0000]Power: +5VDC (approx 100mA without mouse) [/color][/i]
A standard keyboard would require 50-mA maximum (with three LEDs ON) and mouse would max out at about the same. I'd say 300mA would be sufficient.
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I dont know who wrote this, but this one never really measured the current. I did it using a laboratory power suppley. There is a maximum peek of 200mA only while the FPGA is booting (short after loading up the minimig1.bin and 1st reset).
In normal operation there is 135mA of current (FPGA and CPU active).
I could only get about 110mA without loaded FPGA core but this is non normal operation state. 100mA was never seen here :-)
Or just try to measure at your own minimig, perhaps it take more or even less mA... I can only say what I found out.
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What's the consumption when running some intensive game/demo or such?
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That makes no different, The Amiga chipset is always working at "full speed", only some big blitter action could cause more heat in real (Fat)Agnus. In FPGA there is no more or less power consume if the Amiga is running a complex demo/game or just showing the kickstart hand.
The real 68000 cpu is also all time working, no halt-instruction will block it. This is doe to the minimig internal hardware design (Verilog).
Only when the PIC is operating (floppy drive simulation) the power consume could slightly rise about 45-50mA.
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boing4000 wrote:
I dont know who wrote this, but this one never really measured the current. I did it using a laboratory power suppley. There is a maximum peek of 200mA only while the FPGA is booting (short after loading up the minimig1.bin and 1st reset).
Interesting findings :-) What was the supplied lab voltage, I mean specifically (110V/120V/130V etc).
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Input 230V~ only (germany).
Output voltage is adjustable from 0V to 24V.
Ampere can manualy set to a maximum limit of 0mA to 800mA.
Both is displayed via digital numbers (0.2 sec update time).
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@boing4000:
There will be a difference in power consumption when gates are changing between 1 and 0, and when they aren't. So I think we are likely to see a difference in power usage between showing the kickstart logo. And playing an intense demo.
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Yes I know that. The FPGA is working at a very low speed (28MHz) and could work up to 250MHz. All internal gates of all components are static switches (like S-RAM). The FPGA core is operating at 1.25V.
Depending on that the power consume will not grow much if some internel parts like blitter, copper, cpu etc. is active or inactive.
I did check it out but you can also do it by your self :-)