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It's been a long time since I've designed an electronic circuit, can someone please advise the best was to handle this problem.

I have a trigger switch as seen below, the voltage value of SPEED_CTRL should be followed by a buffer which feeds an ADC.

VCC is 3.3v The VAR is around 20k ohm. (please advise if I need to add PU/PD on the VAR)

I would like ACTIVE_SW to also cause the output of the buffer to always be 0v when main_sw is closed otherwise the buffer output should follow SPEED_CTRL.

trigger switch

toolic
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asked Nov 20, 2024 at 21:16
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  • \$\begingroup\$ @Tyassin your right I can use SN74AHC1G125, thanks. \$\endgroup\$ Commented Nov 21, 2024 at 7:46

2 Answers 2

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It seems you can connect ACTIVE_SW to an enable pin of a buffer, which have an active high enable. The input to the buffer should then be SPEED_CTRL.

I ended up using a buffer with output enable like this one SN74AHC1G125.

answered Nov 21, 2024 at 8:04
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I ended up using a buffer with output enable like this one SN74AHC1G125.

answered Nov 21, 2024 at 7:46
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