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Author Topic: Negative -5volts for coin lights and +10 unregulated for logic boards  (Read 2349 times)

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ed12

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Re: Negative -5volts for coin lights and +10 unregulated for logic boards
« Reply #40 on: December 16, 2014, 07:42:12 pm »
pre 3 pin req's
u had them type of can reg's that required +/- sense line
u are digging back to the late 70's/early 80's
the tech for lm305 i will let u look up,
as it is a freggen book onto it's self

ed
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vanwatson

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Re: Negative -5volts for coin lights and +10 unregulated for logic boards
« Reply #41 on: December 16, 2014, 07:55:24 pm »
here is the Datasheet for the LM305
yes it's a Metal Can Regulator

Pin#6 is the feedback
Pin#1 is the Current Limit
Pin#4 is the ground

I think the Sense + and Sense - , Test points are to adjust the current limit of the regulator

ed12

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Re: Negative -5volts for coin lights and +10 unregulated for logic boards
« Reply #42 on: December 16, 2014, 08:16:16 pm »
perty much

ed
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lilshawn

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Re: Negative -5volts for coin lights and +10 unregulated for logic boards
« Reply #43 on: December 16, 2014, 11:35:40 pm »
because it's an old obsolete part that has no internal voltage/current regulation and must be done externally... also i'll just leave this here:

http://www.ti.com/lit/ds/symlink/lm305.pdf