Does Amiga parallel port supply power? (To Plipbox?)

Starglider 2 · 24 March 2016, 04:40

Here is a photo of my AVR-NET-IO board.

In his instructions he mentions an optional 9V power connection to the 2 sockets at the top right. Do I REALLY need a power supply or will the Amiga provide the power? Sadly he doesn't reply about why it's "optional".

Jope · 24 March 2016, 06:31

Not without modifications to the avr board, it won't. The parallel port's power pins are not standard, they are an Amiga oddity.

Starglider 2 · 24 March 2016, 07:53

Hmm, thanks. Can you take a look at point # 2.2 at https://github.com/cnvogelg/plipbox/...rc/hardware.md

Are you able to figure out what he means? Basically, what's the simplest way for me to power this board?

Here's his picture of the board with the power connected:

glenn · 24 March 2016, 08:05

Quote:

Originally Posted by Jope

Not without modifications to the avr board, it won't. The parallel port's power pins are not standard, they are an Amiga oddity.

Well, it wouln't help, the PC-parport does not provide any power at all.

The Amiga however provide power on pin14 (except for A1000 and probably A-rev of A2000), BUT it is only 5V 10mA, not useable to actually power any "normal" hardware, it is only there as a pullup.

Jope · 24 March 2016, 08:05

The simplest way for you to power the board: don't do any modifications to the power circuit and use a 9V supply as is expected by the AVR board.

Starglider 2 · 24 March 2016, 08:30

Quote:

Originally Posted by Jope

The simplest way for you to power the board: don't do any modifications to the power circuit and use a 9V supply as is expected by the AVR board.

Thanks guys. Would any 9V power supply do?

Here's the original item page. Doesn't say much about power. http://www.pollin.de/shop/dt/MTQ5OTg...ate_redirect=1

prowler · 24 March 2016, 20:56

Quote:

Originally Posted by Starglider 2

Thanks guys. Would any 9V power supply do?

Here's the original item page. Doesn't say much about power. http://www.pollin.de/shop/dt/MTQ5OTg...ate_redirect=1

The power requirement is 9V @ 190mA, i.e., a little more than 1.7W.

Starglider 2 · 24 March 2016, 21:42

Thanks. Would 2A be too much, Eg EPtech (6.5 Ft Long Cable) AC 100V-240V Converter Adapter 9V DC 2A Power Supply US 4.0mm x 1.5mm / 1.7mm Plug Tip Center + (Compatible with Amperage range from 1000mA-2000mA , 1100mA 1200mA 1300mA 1400mA 1500mA 1600mA 1700mA 1800mA 1900mA 2000mA ) https://www.amazon.com/dp/B00U4XY004..._tef9wb7RPBR5S ?

prowler · 24 March 2016, 21:55

Yep, that EPtech PSU should be just the job.

The spec is so good it could have been made with the AVR-NET-IO board in mind.

Starglider 2 · 24 March 2016, 21:56

Great, I'll order it right now!

Daedalus · 25 March 2016, 19:55

Yep, looks good. Don't worry about the high current rating, that's just a maximum it can supply, not what it actually puts out. Any electronic circuit will only take the amount of current it requires.

Arnie · 26 March 2016, 09:34

Quote:

Originally Posted by Starglider 2

Hmm, thanks. Can you take a look at point # 2.2 at https://github.com/cnvogelg/plipbox/...rc/hardware.md

Are you able to figure out what he means? Basically, what's the simplest way for me to power this board?

Here's his picture of the board with the power connected:

Does this help?

Daedalus · 26 March 2016, 11:49

If there was an option to power the board from 5V or 12V, you can get those voltages from the external floppy port...

Starglider 2 · 26 March 2016, 16:40

Quote:

Originally Posted by Arnie

Does this help?

Very helpful!

I think I'll go the 9v route as I've already ordered the power supply, but thank you!

xArtx · 28 March 2016, 07:56

If that regulator 3 pin device on the side is a 7805 you can power it between 9-30 Volts,
but lower is better, as the 7805 is warmer the higher the voltage you supply it.
Then the other regulator next to it is probably supplying 3.x Volts for one or more of the chips,
and it may have a limitation lower than the 30 Volts.

Anyway, the serial & par ports aren't designed to power any device the way a game port powers a mouse (100mA).
People have used output pins as a supply for low current devices, but it can only be a good
idea if your device wants less than the pin will provide.
Some early pic programmers got away with this.
You're better off not. Just the Microchip Ethernet controller ENCxxxxxx will probably
want more current alone than you should take from the port.

24 March 2016, 04:40	#1
Starglider 2 Registered User Join Date: Jan 2014 Location: California Posts: 1,146	Does Amiga parallel port supply power? (To Plipbox?) Here is a photo of my AVR-NET-IO board. In his instructions he mentions an optional 9V power connection to the 2 sockets at the top right. Do I REALLY need a power supply or will the Amiga provide the power? Sadly he doesn't reply about why it's "optional".

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24 March 2016, 06:31	#2
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	Not without modifications to the avr board, it won't. The parallel port's power pins are not standard, they are an Amiga oddity.

24 March 2016, 07:53	#3
Starglider 2 Registered User Join Date: Jan 2014 Location: California Posts: 1,146	Hmm, thanks. Can you take a look at point # 2.2 at https://github.com/cnvogelg/plipbox/...rc/hardware.md Are you able to figure out what he means? Basically, what's the simplest way for me to power this board? Here's his picture of the board with the power connected:

24 March 2016, 08:05	#5
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	The simplest way for you to power the board: don't do any modifications to the power circuit and use a 9V supply as is expected by the AVR board.

24 March 2016, 21:42	#8
Starglider 2 Registered User Join Date: Jan 2014 Location: California Posts: 1,146	Thanks. Would 2A be too much, Eg EPtech (6.5 Ft Long Cable) AC 100V-240V Converter Adapter 9V DC 2A Power Supply US 4.0mm x 1.5mm / 1.7mm Plug Tip Center + (Compatible with Amperage range from 1000mA-2000mA , 1100mA 1200mA 1300mA 1400mA 1500mA 1600mA 1700mA 1800mA 1900mA 2000mA ) https://www.amazon.com/dp/B00U4XY004..._tef9wb7RPBR5S ?

24 March 2016, 21:55	#9
prowler Global Moderator Join Date: Aug 2008 Location: Sidcup, England Posts: 10,300	Yep, that EPtech PSU should be just the job. The spec is so good it could have been made with the AVR-NET-IO board in mind.

24 March 2016, 21:56	#10
Starglider 2 Registered User Join Date: Jan 2014 Location: California Posts: 1,146	Great, I'll order it right now!

25 March 2016, 19:55	#11
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,334	Yep, looks good. Don't worry about the high current rating, that's just a maximum it can supply, not what it actually puts out. Any electronic circuit will only take the amount of current it requires.

26 March 2016, 11:49	#13
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,334	If there was an option to power the board from 5V or 12V, you can get those voltages from the external floppy port...

28 March 2016, 07:56	#15
xArtx Registered User Join Date: Jun 2013 Location: Australia Posts: 685	If that regulator 3 pin device on the side is a 7805 you can power it between 9-30 Volts, but lower is better, as the 7805 is warmer the higher the voltage you supply it. Then the other regulator next to it is probably supplying 3.x Volts for one or more of the chips, and it may have a limitation lower than the 30 Volts. Anyway, the serial & par ports aren't designed to power any device the way a game port powers a mouse (100mA). People have used output pins as a supply for low current devices, but it can only be a good idea if your device wants less than the pin will provide. Some early pic programmers got away with this. You're better off not. Just the Microchip Ethernet controller ENCxxxxxx will probably want more current alone than you should take from the port.

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