kodak80 H4 build (x2)

Topic for users to share their building progress.
Post Reply
User avatar
kodak80
Posts: 254
Joined: Sat Oct 21, 2017 1:14 am
Location: Brisbane,QLD Australia
Contact:

Re: kodak80 H4 build (x2)

Post by kodak80 » Sun Dec 15, 2019 1:46 am

Here is my work at the moment. I am using 2x680R as I do not have any 330R resistors.
7C0902E4-1CC9-44E0-BDA3-685E204046F1.jpeg
7C0902E4-1CC9-44E0-BDA3-685E204046F1.jpeg (350.45 KiB) Viewed 1044 times
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boards
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review

User avatar
exxos
Site Admin
Site Admin
Posts: 11272
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
YouTube: https://www.youtube.com/user/exxosuk
Contact:

Re: kodak80 H4 build (x2)

Post by exxos » Sun Dec 15, 2019 1:26 pm

Hard to make it out.. Looks like you have 2x100R in parallel for 50R ? not 330R ?

Though the SMT 75R are just lifted out, and the cap & 330R in series , then soldered to the 2 pads where the 75R ones were.

With 75R termination on the monitor end, this would give 0.7V max output voltage. So I don't know how you ended with more like 2.5V there.

Maybe measure the red output voltage on the the DAC and verify its around the 3V level as the pdf states ?
https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.

User avatar
kodak80
Posts: 254
Joined: Sat Oct 21, 2017 1:14 am
Location: Brisbane,QLD Australia
Contact:

Re: kodak80 H4 build (x2)

Post by kodak80 » Sat Dec 21, 2019 8:00 am

DAC video fix applied to my board using 10k POT and happy to report video output looks great now. POT sits nicely aligned to the modulator rear hole and will allow tweaking once in a case.
07CE4DD1-D6BF-4893-997F-756667D21453.jpeg
07CE4DD1-D6BF-4893-997F-756667D21453.jpeg (318.41 KiB) Viewed 987 times
6BEAFB69-745A-4D44-990E-C116030C10E5.jpeg
6BEAFB69-745A-4D44-990E-C116030C10E5.jpeg (501.33 KiB) Viewed 987 times
A87A9602-6810-4357-BCFA-D32C205526F7.jpeg
A87A9602-6810-4357-BCFA-D32C205526F7.jpeg (434.35 KiB) Viewed 987 times
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boards
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review

User avatar
Icky
Moderator
Moderator
Posts: 2317
Joined: Sun Sep 03, 2017 10:57 am
Location: UK
YouTube: https://tinyurl.com/yals4a3k
Contact:

Re: kodak80 H4 build (x2)

Post by Icky » Sat Dec 21, 2019 10:14 am

Nice neat job @kodak80

User avatar
kodak80
Posts: 254
Joined: Sat Oct 21, 2017 1:14 am
Location: Brisbane,QLD Australia
Contact:

Re: kodak80 H4 build (x2)

Post by kodak80 » Sat Dec 21, 2019 10:34 am

@icky Thanks. I did test the 2 resistors (10k and 4.7k) and the output looked fine, but kept the POT to allow for differences in monitors I use with the H4 board.
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boards
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review

User avatar
exxos
Site Admin
Site Admin
Posts: 11272
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
YouTube: https://www.youtube.com/user/exxosuk
Contact:

Re: kodak80 H4 build (x2)

Post by exxos » Sat Dec 21, 2019 1:04 pm

Does it make any odds to the various monitors if series caps are used in the 75R ? On future boards its likely to be the fixed resistors, so want to make sure the caps have zero effect else I will add them on future boards.
https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.

User avatar
kodak80
Posts: 254
Joined: Sat Oct 21, 2017 1:14 am
Location: Brisbane,QLD Australia
Contact:

Re: kodak80 H4 build (x2)

Post by kodak80 » Fri Dec 27, 2019 10:30 pm

Parallel port solder into place and I have successfully used PARCP-USB to transfer files from my laptop to my SatanDisk so I would say parallel port is wired correctly.

I have my SatanDisk on the internal 20 pin header and this is also working as normal after a warm reset the disk boots up from C: drive. I currently have the LS245 buffer IC jumpered across.
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boards
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review

User avatar
exxos
Site Admin
Site Admin
Posts: 11272
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
YouTube: https://www.youtube.com/user/exxosuk
Contact:

Re: kodak80 H4 build (x2)

Post by exxos » Fri Dec 27, 2019 10:42 pm

Great stuff!
https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.

User avatar
kodak80
Posts: 254
Joined: Sat Oct 21, 2017 1:14 am
Location: Brisbane,QLD Australia
Contact:

Re: kodak80 H4 build (x2)

Post by kodak80 » Sat Dec 28, 2019 9:59 pm

I noticed on my board that capacitor C900 has been chipped and bent by the PSU metal leg. I would suggest relocating this capacitor more to the left on the next board version.
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boards
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review

User avatar
exxos
Site Admin
Site Admin
Posts: 11272
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
YouTube: https://www.youtube.com/user/exxosuk
Contact:

Re: kodak80 H4 build (x2)

Post by exxos » Sun Dec 29, 2019 12:03 am

Can you post a image of this ? I did moved a lot of caps away from the PSU legs already, I was limited on space after all the track moving in most places.
https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.

Post Reply

Return to “MONGREL H4 USER BUILDS”