SMD switch test mod

[xMackx]

I recently found a great deal on some quality smd push button switches I couldn't turn down. This was just a simple quick ugly test mod to see how they performed. They are just great if space is an issue because they take up almost no room. I like the feel of them, reminds me of an ego push button. Now I know I like them I can make something that looks good.

 

[bapgood]

I would give it a good work out and maybe try a low ohm coil, because I don't believe switches like that are typically designed for very much current.

 

[xMackx]

I would give it a good work out and maybe try a low ohm coil, because I don't believe switches like that are typically designed for very much current.

Been vaping off it all week, works great. Been using them on my flash circuit welders as well. Haven't noticed anything wrong with performance yet.

 

[bapgood]

Been vaping off it all week, works great. Been using them on my flash circuit welders as well. Haven't noticed anything wrong with performance yet.

Nice....If it works it works....What ohm coil are you using?

Just to give you an idea....this is a radio shack switch

 

[xMackx]

Nice....If it works it works....What ohm coil are you using?

Just to give you an idea....this is a radio shack switch

2.0 ohm coil... I took one apart and the disc spring has gold plate on the side that makes the connections.

 

[retird]

I wonder what the amperage rating of your smd push button switch is......normally they are rated in mA .....

 

[breaktru]

A typical tactile switch is rated at 50mA. You are putting 1.85A - 2.1A through it.
It will eventually weld or burn out the contacts in the tact.
Plus a tact sw has 100 mohms of resistance while a good 3A pushbutton has less than 30 mohms.

 

[dsy5]

You will probably need that whole bag of switches unless you put a MOSFET in as the switching device...

 

[xMackx]

Yeah I knew what they were rated for, but for 400 switches for 5 bucks I figured I could splurge.

 

[retird]

hum....I'm confused.....knowing what they were rated for, why even use them in your pictured application, knowing they were WAY under-rated for the amperage draw???????

 

[bapgood]

I think the main concern is safety. Most likely when the switch goes it will burn out the contacts and the switch just won't work, but there is the chance that welds it's self closed and then you have a battery in a very dangerous situation.

 

[retird]

Totally agree ... bag...... not to mention a very hot vape with a burnt taste when the switch welds closed....

and for those who read this thread..... best to not "try this at home"......only use switches designed for the purpose.....

 

[xMackx]

I'll let you guys know when the switch dies.

This was a test mod, so definitely don't try this at home.

Dys5 what type of mosfet would you recommend? Are they small enough to make it worth the while?

 

[Robert T]

Seems like they would be ok on the DNA 20 or other chips that have an option for a low amp switch.

 

[WillyB]

Using tact (or under rated) switches on their own is a time honored tradition on these forums from the bygone era.

The 'well it works fine' is the oft repeated mantra.

These were often claimed to work just fine also.

SPST 0.5-Amp Momentary Switch (2-Pack) : Momentary Switches | RadioShack.com

I'm a frugal guy, but anyway you cut it a switch that cost < 2¢ is not on my list.

I thought it was interesting when someone posted a pic of the 26650 Bombshell's switch.

 

[retird]

I saw that pic also and thought to myself......alot of work and thought went into design and not much in hardware spec's.......

 

[asdaq]

Word. Talk about a let down. 26mm round and ~8mm deep and mostly filled with plastic.

To be fair the OP's mod is to 'test' the switches and has lots of failsafes built in. If time is of the essence and there is not enough to yank the battery out, simply throwing it down on the ground there is no way the battery stays in there. Also note the ripcord effect the wiring provides.

 

[xMackx]

Made an ugly test passthrough, 5 volt usb 1.6amp usb adapter. Safer way to see what they can handle.

 

[xMackx]

Also if anyone has any info on hooking up a mosfet I'd be very interested in learning.

 

[retird]

Saving my comments after seeing the last pic........thru with this thread......