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Low cost Hard Disk interface compatible with Atari ST/E family computers

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mast-eries:

--- Zitat von: czietz am Di 01.03.2022, 13:35:25 ---Over in Exxos's forum there is a discussion about power supplies for the ACSI2STM:
https://www.exxoshost.co.uk/forum/viewtopic.php?f=101&t=5199#p81007

I find it quite strange that people say that they need a 1.2(!) A power supply or that only specific USB cables work, which also indicates a significant current draw. Why would that be? Can you please comment on that, @mast-eries?

--- Ende Zitat ---

1.2 A is not needed,

The cheapest good quality power source I have is a Zapaa brand that provides 5 Volts 500mA, its a 2€ power source, that includes an excellent voltage stabilization, there is almost no overvoltage or undervoltage, despite current comsumption.

There are 20€ power sources that are clearly bad, when you saw them in the scope, you see weird voltage fluctuations. A good power source includes proportional and derivative oputput voltage control, many of them provide only proportional control, that leads to overvoltage/undervoltage (fluctuation).


The device usually draws 40 - 60 mA, with some spikes (up to 150 mA) when you are writing to the SD card. Completely normal.

However, you need a very stable 5 volts line in order to power the device; a peak to peak difference of 200 millivolts is not acceptable.


As user Badwolf told, he is able to drop the voltage to 3.8 Volts, and the device still works ok.

But voltage fluctuation appears to be non good for compatibility.


As well, some users found that bad quality USB cables produce no operation of the device,
Personally I tested one of those, and really bad quality cables damage the 5 volts stability, while others don´t.

mast-eries:
To remove

czietz:
Weil es ja in diesem Thread gefragt wurde: Wie dieses Gerät mit HDDRIVER funktioniert, wird hier beschrieben: https://www.hddriver.net/forum/viewtopic.php?p=887

cyberish:

--- Zitat von: mast-eries am Di 01.03.2022, 16:54:42 ---
--- Zitat von: czietz am Di 01.03.2022, 13:35:25 ---Over in Exxos's forum there is a discussion about power supplies for the ACSI2STM:
https://www.exxoshost.co.uk/forum/viewtopic.php?f=101&t=5199#p81007

I find it quite strange that people say that they need a 1.2(!) A power supply or that only specific USB cables work, which also indicates a significant current draw. Why would that be? Can you please comment on that, @mast-eries?

--- Ende Zitat ---

1.2 A is not needed,

The cheapest good quality power source I have is a Zapaa brand that provides 5 Volts 500mA, its a 2€ power source, that includes an excellent voltage stabilization, there is almost no overvoltage or undervoltage, despite current comsumption.

There are 20€ power sources that are clearly bad, when you saw them in the scope, you see weird voltage fluctuations. A good power source includes proportional and derivative oputput voltage control, many of them provide only proportional control, that leads to overvoltage/undervoltage (fluctuation).


The device usually draws 40 - 60 mA, with some spikes (up to 150 mA) when you are writing to the SD card. Completely normal.

However, you need a very stable 5 volts line in order to power the device; a peak to peak difference of 200 millivolts is not acceptable.


As user Badwolf told, he is able to drop the voltage to 3.8 Volts, and the device still works ok.

But voltage fluctuation appears to be non good for compatibility.


As well, some users found that bad quality USB cables produce no operation of the device,
Personally I tested one of those, and really bad quality cables damage the 5 volts stability, while others don´t.

--- Ende Zitat ---

I tried to google for that ZAPAA power supply without any luck. Do you have a link or something? thx

dbsys:

--- Zitat von: czietz am Mi 09.03.2022, 21:08:08 ---Weil es ja in diesem Thread gefragt wurde: Wie dieses Gerät mit HDDRIVER funktioniert, wird hier beschrieben: https://www.hddriver.net/forum/viewtopic.php?p=887

--- Ende Zitat ---

Vielen Dank dafür, uns auf die Diskussion im HDRIVER Forum aufmerksam zu machen. Es ist sehr interessant zu erfahren, was Uwe Seimet zu diesem Thema zu sagen hat.

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