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P/Supply board _ Which resistor to change?
P/Supply board _ Which resistor to change?
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Old 19th July 2019, 10:04 PM   #1
gigigirl is offline gigigirl
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Default P/Supply board _ Which resistor to change?

Hi Guys, A little help please. I stupidly ordered two of these boards without fully reading the description, Thinking they were adjustable, I need 18 VDC but got the default 5 VDC.

LT1963A LT1963 regulated power supply board for decoding, preamplifier coaxial | eBay

The vendor advises I just need to change the resistors, But can anyone advise what value? Or do I just need to increase or decrease the resistance by trial & error to get it right.

Cheers
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Old 19th July 2019, 10:08 PM   #2
gigigirl is offline gigigirl
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Default Picture of un-populated board

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Old 19th July 2019, 10:23 PM   #3
rayma is offline rayma  United States
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It's difficult to tell the resistor values on the board, but use

18V = 1.21V x ( 1 + R2/R1 ) .... and then 13.88 x R1 = R2

Keep R2 the same, and decrease R1.
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Old 20th July 2019, 01:45 AM   #4
gigigirl is offline gigigirl
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Hi, Thanks rayma I will give that a go.

Cheers
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