Labradar recoil trigger DIY

Do you mind sharing where you got it from?

A place called JKL Precision have them listed for $35. I didn't buy any, obviously ;)

I actually have the sensitive version recoil trigger that I put together for testing the 555 timer that I don't intend to use. It's free to a good home if you want it.
 
Thanks @10 Ring Tao for bring this thread back to the surface! I thought I posted this...but apparently I didn't. Here is the schematic of my final version of the labradar trigger with both recoil and sound capabilities.

One caution if you are attempting this...make sure you use a CMOS based 555 timer (TLC555). They are needed for the 3v supply from the labradar.

Recoil_trigger_final.png

ETA info on 555 timer.
 
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Thanks @10 Ring Tao for bring this thread back to the surface! I thought I posted this...but apparently I didn't. Here is the schematic of my final version of the labradar trigger with both recoil and sound capabilities.

View attachment 1137216
Would you mind posting a picture of what the physical shape of your trigger ended up looking like?

I’m curious as to how big this ended up being.
 
The pictures you posted don’t include the timer, voltage comparator and switch shown on the schematic.
I was wondering how you incorporated all that into a small package to fit on a rifle.

It's a bit hard to see. Here is a picture with the components pointed out. All the capacitors and resistors are on the other side of the proto board.

Recoil_trigger_components.png
 
I know there are labradar recoil triggers available for purchase that range in price from $35 to $50...but what's the fun in that? :D

So I want to make one myself. Primary reason for wanting one is so I don't have to reposition the radar for different rifles.

So far, I have figured out that for the stereo plug used for the external trigger 3 sections are voltage supply at the tip, presumed control signal middle ring, and then ground.

I am guessing a voltage proportional to the supply voltage to the signal connection is what is used for external triggering.

Have anyone made one that have pointers that they are willing to share?
 
Thanks for sharing!

But be careful using the piezo speaker directly. The voltage from the speaker is proportional to pressure, and it can spike pretty high if the pressure is high enough (like placing it right next to the muzzle). The high voltage may damage the labradar.

Cheapest is still to simply use a direct wired shake switch.
 
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