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Re: Miracle Systems Floppy PSU
Posted: Tue Oct 22, 2013 12:07 am
by Dave
Given the floppies use only +5v, even a couple of good quality USB adaptors can be rigged to supply power for the floppies. All you'd need to do is disassemble them and use the knowledge you've already demonstrated

Re: Miracle Systems Floppy PSU
Posted: Tue Oct 22, 2013 9:34 am
by RWAP
As I said - if you want to keep to the Genuine Miracle systems solution - I can supply you with a psu from a miracle case here....
Re: Miracle Systems Floppy PSU
Posted: Tue Oct 22, 2013 9:42 am
by bagpuss22
OK,
I have had a look and 1 of the input AND 1 of the output windings are Open Circuit, so I would
say the transformer has gone.
I am a little confused as I am not sure if this PSU is supposed to supply +5v or +12v as the #
floppy drive takes both on its connector! Might lift the regulator and see what it is.
Anyway Rich, what would be the cost of a replacement?
Thanks
Russ
Re: Miracle Systems Floppy PSU
Posted: Tue Oct 22, 2013 11:04 am
by RWAP
bagpuss22 wrote:OK,
I have had a look and 1 of the input AND 1 of the output windings are Open Circuit, so I would
say the transformer has gone.
I am a little confused as I am not sure if this PSU is supposed to supply +5v or +12v as the #
floppy drive takes both on its connector! Might lift the regulator and see what it is.
Anyway Rich, what would be the cost of a replacement?
Thanks
Russ
Ermm £10 plus postage
Rich
Re: Miracle Systems Floppy PSU
Posted: Tue Oct 22, 2013 11:09 am
by bagpuss22
OK,
Update from my last posting.
Input winding is definately O/C, output winding I am not too sure and will have to check again
tonight. I come to this conclusion as I see that the Floppy only required 5v dc (only states 5v as a supply on the case), therefore the 2 x 9v output windings are in parallel giving 9v and therefore the regulator woukld be a 7805.... Phew!
Anyway Rich, if you could let me know the total value of the unit + shipping, and maybe package it all together with my Psion Chess, then I can make you a payment to cover it.
Thanks
Russ
Re: Miracle Systems Floppy PSU
Posted: Tue Oct 22, 2013 11:22 am
by vanpeebles
Professor Yaffle would have fixed it for you
Psion Chess is a beast of game too!
Re: Miracle Systems Floppy PSU
Posted: Tue Oct 22, 2013 11:24 am
by bagpuss22
And the 'mice of the magic mouse organ!!!'
I know what you mean about Psion Chess, awesome game.
Re: Miracle Systems Floppy PSU
Posted: Tue Oct 22, 2013 11:57 am
by RWAP
PayPal invoice sent
Re: Miracle Systems Floppy PSU
Posted: Tue Oct 22, 2013 12:25 pm
by bagpuss22
Invoice payed

Re: Miracle Systems Floppy PSU
Posted: Tue Oct 22, 2013 2:56 pm
by 1024MAK
Yes, if the drives only need +5V, the 7805 will supply them. This was my first thought, that the drives are single supply models. However, when I searched for information on them, I found a picture showing the model number and also showing the power requirements, which stated +5V and +12V. So it looks like both types were produced.
Mark