Search found 189 matches

by belg4rion67
Sun Nov 24, 2019 9:01 am
Forum: Hardware
Topic: Issue 6 board updates
Replies: 105
Views: 58124

Re: Issue 6 board updates

:D wow, great work, amazing !
Bravo
by belg4rion67
Sun Mar 17, 2019 4:35 pm
Forum: Hardware
Topic: QL test points...
Replies: 19
Views: 11871

Re: QL test points...

Me too!
by belg4rion67
Sat Feb 09, 2019 8:40 pm
Forum: Hardware
Topic: Scart to vga or hdmi
Replies: 2
Views: 1911

Re: Scart to vga or hdmi

Hi, try to use search bar, we have discussed this some times ago.
by belg4rion67
Wed Dec 19, 2018 10:39 pm
Forum: Hardware
Topic: LM7805 3A
Replies: 7
Views: 5004

Re: LM7805 3A

Yes of course, there’s no problem to use it, in effect I have changed regulator into my QL with a switching one with 3.5 amps capability.
by belg4rion67
Wed Sep 26, 2018 8:28 am
Forum: Hardware
Topic: VGA BOX
Replies: 4
Views: 3706

Re: VGA BOX

yes is true! see this picture: http://www.fruitcake.plus.com/Sinclair/ ... ableQL.htm
QLCableCircuit.gif
QLCableCircuit.gif (5.25 KiB) Viewed 3574 times
by belg4rion67
Tue Sep 25, 2018 7:34 pm
Forum: Hardware
Topic: VGA BOX
Replies: 4
Views: 3706

Re: VGA BOX

It’s possible because the video signals from that ULA are direct and not protected to rgb socket! If you have some experience with soldering you can attach some zener diodes to protect output pins.
by belg4rion67
Sun Sep 23, 2018 7:08 pm
Forum: Hardware
Topic: QL wont work
Replies: 15
Views: 8194

Re: QL wont work

D26 is the diode that bring negative rail to -12 volt regulator ic so is it possible that you have checked the ac voltage that feed power supply; try check the c40 condensator if it has 0 and -12 volt, but in effect that voltage is needed only for rs232 ports so is not the main problem ....
by belg4rion67
Sat Sep 22, 2018 2:16 pm
Forum: Hardware
Topic: QL wont work
Replies: 15
Views: 8194

Re: QL wont work

Hi, on the voltage regulator you must have 9-10 volt on right pin that is the output voltage of transformer and 5 volt on left pin to drive all chips on motherboard, also you can check pin 14 of video driver chip ( the one below modulator) where you must have 12 volt.
by belg4rion67
Sat Aug 25, 2018 11:54 pm
Forum: Hardware
Topic: PSU - Alternative
Replies: 1
Views: 1764

Re: PSU - Alternative

Hi, any psu that can supply 9 volt dc with at least 1.5 ampere and 15 volt ac with at least 500 mAmpere.
by belg4rion67
Sat Aug 11, 2018 12:39 pm
Forum: Hardware
Topic: Connecting a mouse to the QL
Replies: 8
Views: 5074

Re: Connecting a mouse to the QL

Hi, if you search into forum you will find a topic about an interface to connect a ps2 mouse and also in Dilwyn web site you will find a lot of infos about your request.