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Old 04-06-2016, 08:45 AM #1
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Default Switch wiring for dual button

Hi~

this is wiring diagram i made for dual switch setup.

conventional rubber or silicon click buttons are unable to verify whether
they are ON or OFF states currently, so sometimes it is somewhat dangerous
to load battery and capping it.

Using 12V 3A chrome push-lock button on the rear and push-on button for
side, this setup provides power is standby status by lights up LED when
you click the rear button.




Last edited by ferrarihong; 04-06-2016 at 08:58 AM.
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Old 04-06-2016, 08:50 AM #2
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Default Re: Switch wiring for dual button

Hi F,
By you referring to push button the proper term for this is called a latching switch.

Rich
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Old 04-06-2016, 08:57 AM #3
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Default Re: Switch wiring for dual button

Quote:
Originally Posted by Lifetime17 View Post
Hi F,
By you referring to push button the proper term for this is called a latching switch.

Rich
oh~ O.K. it is latching switch. thanks~
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Old 04-06-2016, 09:06 AM #4
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Default Re: Switch wiring for dual button

Hi Looks like in your diagram it's a case Pos+ build. All my pen builds are case Neg-. Oh if you need an answer PM the Pman here on LPF he's the pen guru with some awesome builds..

Rich
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Old 04-06-2016, 11:30 AM #5
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Default Re: Switch wiring for dual button

I've built a lot of pens over the years but that doesn't mean yours aren't just as good or better Rich Thanks for the compliment though.
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Old 04-06-2016, 08:52 PM #6
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Default Re: Switch wiring for dual button

Hi Pman,
Hey you deserve the kudos brother don't be so modest buddy. suck em up my man LOL..

Rich
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Old 04-07-2016, 06:50 AM #7
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Default Re: Switch wiring for dual button

Quote:
Originally Posted by ferrarihong View Post
... conventional rubber or silicon click buttons are unable to verify whether they are ON or OFF states currently, so sometimes it is somewhat dangerous to load battery and capping it...
My sentiments exactly. Nice work putting in the effort to draw it up.

I prefer dual button hosts too and your post motivated me to draw up a couple diagrams but mine are case negative. It does what the OP's diagram does - when the tailcap switch is switched ON the LED in the momentary lights up to alert the user that the laser will light up if the momentary switch is deliberately or accidentally pressed.

I included a resistor to limit current in the LED/Momentary Switch in case a 12V version is unavailable. 12V LED momentary switches (often advertised as boat switches) already have current limiting built in but they expect the full 12V to illuminate the LED at its brightest. The farther away from 12V you are the dimmer the LED will be. For example, if you're only using one Li-Ion battery, at most you'll have ~4.2V (max) instead of 12V, roughly 1/3rd thus only 1/3rd of the current it was designed for will drive the LED. With two batteries you double the voltage to ~8.4V (max) which is still only ~2/3rds of 12V thus the current into the LED will only be 2/3rds of what it was designed for. While less, the purpose of the LED is to alert the user that the tailcap switch is turned ON thus while dimmer, it still may 'function' fine.

The calculation for the resistor value is in another post which I'll find and add to this post with an edit. It's just Ohm's law again (V=IR). Most LEDs in these switches are ~3V thus the resistor is sized based on the total battery voltage you intend to use (e.g. one or two batteries) and the max current the LED can take (or that you desire). A typical value for max LED forward current is If=20mA max.

The switch in the tailcap can also be a SPST (instead of SPDT as shown) and are sometimes called a 1NO switch if/when searching eBay.

Here is a schematic of sorts ...


And a diagram with component pictures ...


If I made a boo boo anywhere I'm sure someone will spot it and call me out on it ... So I guess I'll put this post out as a 'peer review'. I already see some changes I'd like to do to the schematic.

Last edited by OVNI; 04-07-2016 at 07:31 AM. Reason: Better pictures
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Old 04-07-2016, 12:52 PM #8
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Default Re: Switch wiring for dual button

Quote:
Originally Posted by OVNI View Post
My sentiments exactly. Nice work putting in the effort to draw it up.

I prefer dual button hosts too and your post motivated me to draw up a couple diagrams but mine are case negative. It does what the OP's diagram does - when the tailcap switch is switched ON the LED in the momentary lights up to alert the user that the laser will light up if the momentary switch is deliberately or accidentally pressed.

I included a resistor to limit current in the LED/Momentary Switch in case a 12V version is unavailable. 12V LED momentary switches (often advertised as boat switches) already have current limiting built in but they expect the full 12V to illuminate the LED at its brightest. The farther away from 12V you are the dimmer the LED will be. For example, if you're only using one Li-Ion battery, at most you'll have ~4.2V (max) instead of 12V, roughly 1/3rd thus only 1/3rd of the current it was designed for will drive the LED. With two batteries you double the voltage to ~8.4V (max) which is still only ~2/3rds of 12V thus the current into the LED will only be 2/3rds of what it was designed for. While less, the purpose of the LED is to alert the user that the tailcap switch is turned ON thus while dimmer, it still may 'function' fine.

The calculation for the resistor value is in another post which I'll find and add to this post with an edit. It's just Ohm's law again (V=IR). Most LEDs in these switches are ~3V thus the resistor is sized based on the total battery voltage you intend to use (e.g. one or two batteries) and the max current the LED can take (or that you desire). A typical value for max LED forward current is If=20mA max.

The switch in the tailcap can also be a SPST (instead of SPDT as shown) and are sometimes called a 1NO switch if/when searching eBay.

Here is a schematic of sorts ...


And a diagram with component pictures ...


If I made a boo boo anywhere I'm sure someone will spot it and call me out on it ... So I guess I'll put this post out as a 'peer review'. I already see some changes I'd like to do to the schematic.
Wow~! this is very nice. not only the schematic, but also the actual wiring pics! as you says using one 18650 battery on 12V button LED is significantly dim. thus this will be really helpful for my next project. thanks!

Last edited by ferrarihong; 04-07-2016 at 01:14 PM.
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