Pushbutton that opens when pressed?
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Eypw 3 months ago
Do pushbuttons exist that are normally closed but open (disconnect) a circuit as long as they are pressed? Are any of those available as SMD components? I'm searching for this as a reset button for USB-powered USB devices - to temporarily disconnect the 5V line while this button is pressed, and where this pushbutton is the only component.
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andyfierman 3 months ago
What you need to search for is a normally closed or a single pole double throw (SPDT) non-latching momentary action switch. With an SPDT you use the normally closed contacts. Interrupting the power supply (Turn-Off, Turn-On or TOTO) is a very brute force method of resetting any system normally reserved for resetting very badly crashed computers. Is there some reason that you cannot reset the device(s) being powered by a more usual reset input as would exist on processor and logic devices such as flip-flops and counter?
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andyfierman 3 months ago
[https://lcsc.com/products/Tactile-Switches_427.html?q=Switch%20smd%20spdt](https://lcsc.com/products/Tactile-Switches_427.html?q=Switch%20smd%20spdt)
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Eypw 3 months ago
Thank you! I actually need to forcefully disconnect and reconnect a device for testing.
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andyfierman 3 months ago
You might be better to use a mosfet as the switching element and control that from a debounced switch or a pulse generator.
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