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Questions tagged [switches]

Devices to interrupt or route a signal or power one of several ways.

7
votes
4answers
2k views

Latching switch ideas

I'm trying to build a latching switch connected to a door and would appreciate ideas. The switch is connected to a microcontroller input pin, and I'd like it to operate as follows: When a person ...
5
votes
3answers
335 views

Choosing a switching device

I am overwhelmed with the variety of switching devices. MOSFETS/BJTS Relays(mechanical/solidstate),optoisolated solutions, etc.. I need to support 15V, 60A bursts, should be high efficiency, and ...
5
votes
1answer
1k views

Old Hall-Effect Keyswitches?

I have a keyboard from an old Silent 700 TTY that I'm trying to bring to life. The problem is that each individual keyswitch appears to be a hall effect sensor. There are no part numbers; the chip ...
9
votes
3answers
2k views

Need help operating a transistor

I have a relay operated by an NPN transistor that needs some voltage applied to the base. I'm working with an arduino and if I give it a digital port, all's well. The circuit looks like this one: ...
7
votes
6answers
3k views

How can I convert the output from a momentary switch to a pulse on push and a pulse on release?

The title pretty much says it all. I have an idea to try out involving a op-amp differentiator circuit and a diode bridge, but I am flying blind. Also I am trying to accomplish this without a micro-...