Need some help designing a switch circuit

[Paul]

I want to make a switch for my flashlight project. The idea is to have one button to turn the light on and off with and one to change mode (break the connection when pushed and make it when released). As switches I've got some small push-to-make buttons that I'd like to use.

I think that what I want is to use a transistor as a switch (as the buttons are low rated), like this:

For the box A (change mode) I would need to make something that includes a button and that is connected when the button isn't pushed. Some kind of inverter maybe?

For the box B (on/off) I would need something like an alternate-action circuit. Maybe something like this? Don't know how it works, but it's the best I've found.

Maybe somebody give me some help on this one?

 

[Th232]

My first choice would be to buy another switch. Why do you want to use those momentaries? Seems to me that a reverse clicky is pretty much what you want, and all in one package as well.

If you're dead set on using the push-to-make switches you have...

One cheap and extremely nasty solution would be to wire the circuit up so that switch A is between GND and the +ve terminal of switch B. Press to short circuit and hence cut current to B, leave it alone to let current flow through B. As I said though, extremely nasty, and I personally wouldn't use it.

For making a momentary switch into a push-button, I personally use this:
http://www.edn.com/contents/images/102804di.pdf

Personally, I'd just buy a reverse clicky and save the momentaries for an application they're more suited to.

 

[Paul]

My first choice would be to buy another switch. Why do you want to use those momentaries? Seems to me that a reverse clicky is pretty much what you want, and all in one package as well..

A reverse clicky would do the trick, but I'd like to have two buttons for the interface. The main reason I don't want to use momentaries is that it would take up more space than using two small push-to-make buttons. At least with those buttons I've seen around.