Hello all - thankyou for taking the time to read my 1st post!
I am a sinclair fan and recently picked up a cheap Sinclair QL computer from the 80's. Unfortunately it did not come with a power pack, and it appears the power pack is an unusual beastie and very hard to come by. So I wondered how difficult it would be to re-create such a Power pack.
Looking online it shows that the original power pack carries two loads - a 9v DC 1.8a and a 15.6Vac 02.a, and a common ground.
http://www.dilwyn.me.uk/docs/hardware/qlpsu.png
I guess its easy enough to get hold of a 9v dc power supply, but I am stuck on trying to find a 15.6Vac power pack.
I was thinking about re-creating the 15.6vac line myself, but this is where my knowledge lets me down - i know very little about designing electronics. i have a very basic understanding of components, but have no idea on how to create my own circuits etc.
From my rudementary understanding I thought I could just use a transformer to generate this power line.
I see on ebay I can buy a transformer that will convert 230vac to 15vac, but this is not 15.6vac. Do I really need 15.6vac, or is 15vac close enough - is there usually a tolerance allowed (like a cap with +-20% etc)
http://www.ebay.co.uk/itm/Encapsula...hash=item2a1b163b77:m:mZyvhEy-bcWlksgtjwXKggQ
Do I need to go for the higher rated 230vac to 18vac maybe, then somehow step down again to 15.6v. If this is so, then i am lost. What do i need to do to achieve this. Also I believe these dont have enough amperage so how do i get around that - these ebay transformers show 60mA but I believe the 0.2a requirement on the ql psu diagram equates to 200mA??
So sorry for the dumb questions, but I was hoping for a quick easy resolve to this, and the more I look into it, the further out of depth I feel!
Regards
Jason
I am a sinclair fan and recently picked up a cheap Sinclair QL computer from the 80's. Unfortunately it did not come with a power pack, and it appears the power pack is an unusual beastie and very hard to come by. So I wondered how difficult it would be to re-create such a Power pack.
Looking online it shows that the original power pack carries two loads - a 9v DC 1.8a and a 15.6Vac 02.a, and a common ground.
http://www.dilwyn.me.uk/docs/hardware/qlpsu.png
I guess its easy enough to get hold of a 9v dc power supply, but I am stuck on trying to find a 15.6Vac power pack.
I was thinking about re-creating the 15.6vac line myself, but this is where my knowledge lets me down - i know very little about designing electronics. i have a very basic understanding of components, but have no idea on how to create my own circuits etc.
From my rudementary understanding I thought I could just use a transformer to generate this power line.
I see on ebay I can buy a transformer that will convert 230vac to 15vac, but this is not 15.6vac. Do I really need 15.6vac, or is 15vac close enough - is there usually a tolerance allowed (like a cap with +-20% etc)
http://www.ebay.co.uk/itm/Encapsula...hash=item2a1b163b77:m:mZyvhEy-bcWlksgtjwXKggQ
Do I need to go for the higher rated 230vac to 18vac maybe, then somehow step down again to 15.6v. If this is so, then i am lost. What do i need to do to achieve this. Also I believe these dont have enough amperage so how do i get around that - these ebay transformers show 60mA but I believe the 0.2a requirement on the ql psu diagram equates to 200mA??
So sorry for the dumb questions, but I was hoping for a quick easy resolve to this, and the more I look into it, the further out of depth I feel!
Regards
Jason