Superboard II Rev D construction.

dave
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Re: Superboard II Rev D construction.

Post by dave » Thu Mar 21, 2019 4:04 pm

Hi Walter,

Is it possible the picture is too large? What happens if you resize the image and try again? For example, I just tried to attache Jeff's photo of his board, and it attached just fine. It's 1.6 MB. (I have since edited to delete it.)

Many cameras and phones will routinely take photos larger than 5 MB, and that may be the issue. What is happening when you are unable to post? Are you selecting the file, and it's not showing up as an attachment?

Dave

dave
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Re: Superboard II Rev D construction.

Post by dave » Thu Mar 21, 2019 4:09 pm

Also, where is the facebook group?

waltermixxx
Posts: 118
Joined: Sun Feb 03, 2019 10:31 pm

Re: Superboard II Rev D construction.

Post by waltermixxx » Thu Mar 21, 2019 8:21 pm

https://www.facebook.com/groups/69644500408/

i prefer forums to facebook groups.
but there is an OSI facebook group which is neat. :)
Turning into quite an OSI Junkie (HTFDTH?) Superboard II REV B-40K, 9600b, HC-05 Bluetooth, Superboard II Rev D, C4P rebuild- 502, 542c, 540B. :)

waltermixxx
Posts: 118
Joined: Sun Feb 03, 2019 10:31 pm

Re: Superboard II Rev D construction.

Post by waltermixxx » Mon Mar 25, 2019 1:37 pm

here is my progress so far...
just wondering about capacitors, sometimes it specifies high voltage caps when clearly the voltage will never get beyond 5 volts.
can i use lower voltage caps? 200 volts instead of 1000? that sort of thing.... at any rate, here she is:
IMG_0177.jpeg
IMG_0177.jpeg (1.12 MiB) Viewed 1668 times
Turning into quite an OSI Junkie (HTFDTH?) Superboard II REV B-40K, 9600b, HC-05 Bluetooth, Superboard II Rev D, C4P rebuild- 502, 542c, 540B. :)

dave
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Re: Superboard II Rev D construction.

Post by dave » Mon Mar 25, 2019 2:40 pm

Very nice!

Regarding the caps, in general for the situation you described, you should be able to go with lower voltage caps. As a rule of thumb, you will be fine if you're more than double the max expected voltage. I wonder why a 1000V cap would have been specified(!). What circuit is it in?

Cheers,

Dave

waltermixxx
Posts: 118
Joined: Sun Feb 03, 2019 10:31 pm

Re: Superboard II Rev D construction.

Post by waltermixxx » Mon Mar 25, 2019 9:13 pm

it's in the REV D. parts list:
C57 27PFD 1KV 10%

also I think the REV. B has a few of these larger Voltage caps
in a few placed. :)

I've decided to use the Superboard_II_Assembly_Instructions.pdf to build this computer.
and the values assigned by it. :) So i will be back tracking a bit. Just to verify all is well.

:)I'm hoping to finish this computer before mid April. :)
Turning into quite an OSI Junkie (HTFDTH?) Superboard II REV B-40K, 9600b, HC-05 Bluetooth, Superboard II Rev D, C4P rebuild- 502, 542c, 540B. :)

waltermixxx
Posts: 118
Joined: Sun Feb 03, 2019 10:31 pm

Re: Superboard II Rev D construction.

Post by waltermixxx » Tue Mar 26, 2019 3:19 am

Q1 and Q2 on the board....
the schematic and the transister placement do not appear to line up?

the Emitter and collector seem to be reversed on both?
in the schematic the Q1 Emitter goes to R72 and collector to R65 half watt 1K resister....
in the placement, image posted earlier with all the placements indicators over the motherboard image,
seems to tell a different story... same issue with Q2.... help? I dont like transisters...
Turning into quite an OSI Junkie (HTFDTH?) Superboard II REV B-40K, 9600b, HC-05 Bluetooth, Superboard II Rev D, C4P rebuild- 502, 542c, 540B. :)

dave
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Re: Superboard II Rev D construction.

Post by dave » Wed Mar 27, 2019 4:47 pm

Can you post some close ups of the area with the transistors in question?

waltermixxx
Posts: 118
Joined: Sun Feb 03, 2019 10:31 pm

Re: Superboard II Rev D construction.

Post by waltermixxx » Thu Mar 28, 2019 4:26 pm

I will post some close ups, in the mean time, i just soldered them in based on the schematic,
and for the 2N3906/3904's i had, the flat side faced east as indicated in the Superboard II contruction document. :)

on another front, does anyone have any spare MX locking switches for the REV D board? Did anyone buy any extra's?
if so, happy to pay what ever you think they are worth, or I may have to resort to this little circuit, making use of the non
toggle and a bit of track cutting.... This is the smallest circuit i could find, i would use this with the LED, and a tiny 5 volt relay.
usually those have a toggle on them so when not engaged (less current) i can have it in the lock position by default, and engage
it to remove the caps lock. here is what I as thinking: replacing D4 with a tiny 5volt relay....it will produce a nice click as if it
was coming from the switch itself....

Image

with one of these on the output:

Image
Turning into quite an OSI Junkie (HTFDTH?) Superboard II REV B-40K, 9600b, HC-05 Bluetooth, Superboard II Rev D, C4P rebuild- 502, 542c, 540B. :)

Klyball
Posts: 195
Joined: Tue Dec 09, 2014 12:53 am

Re: Superboard II Rev D construction.

Post by Klyball » Thu Mar 28, 2019 5:32 pm

you could just put the switch on,

:D
600key.jpg
600key.jpg (110.96 KiB) Viewed 1632 times
Replica 600 Rev D:8K,CEGMON
Replica 610 Rev B: 24k,MPI B-51 with Custom Data separator D-13
510 on the bench/replica 582 backplane/replica 470a /replica 555/original 570B/2 x Shugart 851
Ongoing : 630 ,620 ,510,542c,custom 590,SA1200,592,594,596,598

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