30 Jun
2011
30 Jun
'11
11:03 a.m.
On Wed, Jun 29, 2011 at 5:45 PM, Pete Turnbull <pete at dunnington.plus.com>
wrote:
> Some pictures can be seen at
http://tinyurl.com/5w4l6uv
Does anyone have any lamp information on the indicator panels? I have
one (courtesy of a list member) that was gifted to me with no lamps From what I remembrm the panels are just lamps and
driver transistrors,
so the lap voltage is determined by the PSU you use (within
reason ;-)).
I think DEC used an 8V (probably unregulted) supply line for them in the
DX11.
One thing to be aware of is that there are no ground pins on the ribbon
cables. All are signals. You have to complete the circuit by ensuring the
lmap power supply shares its 0-V rail wit hthe sytem logic supply.
and I'd like to do something interesting with it
someday (including,
most likely, building LED lamp replacements vs buying dozens of $2
bulbs).
DEC had some official bi-pin LED modules (I think I've seen similar
things in the catalogues, but theu're not cheap, particularly if you need
144 of them). You have to dike out the preheat resistor in each driver
circuit if you use LEDs. If you use bare LEDs, you have to add a suitable
seires resistro (so suit the supply you're running the lamps from).
-tony