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What Voltage Bulb on PDP 11/45

Marty

Veteran Member
Joined
Jul 26, 2009
Messages
3,141
Location
Boulder , Colorado USA
Hi All;
Does anyOne know What Voltage Bulb was used on the Front Panel for the PDP 11/45 ??? My guess is somewhere around 8 volts to 14 volts.. I am assuming that it originally used Bulbs, but it could have been Leds, since the PDP 11/40 was Led's..
I am Thinking for Now that IF possible I will use Led's. Since I have Plenty.. And with the Pull-up resistor that the Front Panel uses will help determine what voltage I need for the Leds.. But, knowing what voltage was originally used would help me (I think)..
THANK YOU Marty
 

Marty

Veteran Member
Joined
Jul 26, 2009
Messages
3,141
Location
Boulder , Colorado USA
HI All;
I found my answer, it was a 15 Volt supply with a 220 ohm resistor, So I can change it to a 5 volt supply with about another 100-300 ohms or so from the Power Supply just to make things last longer..
But, I still would like to know What voltage Bulb was originally used, maybe a 16-24 volt bulb to make them last longer ??
THANK YOU Marty
 
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