Pulse rifle related electronics - help!

[LDR]

I'm currently adding miscroswitches to my PR to work electronics, counter and sounds.
However as my PR is a cap firing one, there is very little room.

I need a super thin switch to go inside the Thompson. Also i need it reversed, so:

trigger is not pressed, the switch is pressed, and the circuit broken.

when:

trigger is pressed, the switch is released, and circuit is made.


So, ive found these in the uk, which are 0.25mm thick which is perfect.

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P14169DKR-ND

However im not sure if they do what i require.

Can anyone give me advice on these? Are these like microswitches but flat? and do they wire up like microswitches? Just solder pos and neg wires to them? Finally if wired the other way round, does it reverse the function?

Thanks in advance!

lewis

 

[Ttaskmaster]

I'm no expert on electronics, by any stretch, but...

Can you not do away with the whole 'reversed' business and put a switch behind the trigger instead?
As I understand it, you'd then have - "trigger is pressed, the switch is pressed, and circuit is made".


It just seems simpler.
Is there a specific reason for needing the circuit broken when the trigger is pressed?

 

[LDR]

Hi thanks for the reply.

I know it sounds a bit long winded, but the only space available is infront of the trigger.

I've found a nice gap, that is closed when the trigger is not pressed, and opens when the trigger is pressed. So a perfect place for a switch.

Hope that makes sense.

I know you can wire a microswitch and it functions the other way round...so circuit made until the button is pressed.

Any ideas on the tactile switch in question?

 

[Sidewinder]

I have a PFC Thomp and see where u wanna put it.

You need a 'normal closed' momentary switch.

That one u found is 'normal open' momentary ie. u press it it makes a circuit, doesn't matter how u wire it up.

SAS

 

[LDR]

Thanks SAS, thats just the info i needed.

So do you know where i can get one of these (a NC one) 1mm or less in height really?

Any ideas?

Thanks again.

lewis

 

[Mr.Engineer]

I am not familiar with your version of the pulse rifle, but have you tried the SMD switches? But you have to be careful as although they are small, they could be very fragile and yeah, its mostly NO.

There is another idea, the design of those power switches in the 90's PC where the power switch is not a power switch but just a moulded cap connected to a long metal rod which pushes the actual switch hidden deep inside the PC, or the power supply. You can use this idea on a microswitch.

But its just an idea........

 

[Sidewinder]

You could drill a hole in the curve behind the trigger and have a push on switch positioned there (hollow out the grip a bit too) and have the trigger actuate that when u pull it. Ok it would be visible but makes for an easier build.

SAS

 

[g05ty]

Have a look at "front brake light switches" for japanese motorcycles some of these are very small and complete the circuit when the brake lever is pulled (pressure taken off the switch) so when you pull the trigger it would be doing the same thing ... pull trigger=>pressure taken off the switch & circuit completed.

 

[LDR]

Thanks for the replies guys. I've found a small NC switch, which im going to test out on an old hudson receiver i have.

LDR