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Old 03-11-2014, 09:55 AM #1
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Default Single Pulse Driver Circuit

Good Hello,

I recently acquired some 1:1 replica assualt rifle guns that are plastic and have switches and lights and what not.

I plan to fit a high power blue laser in the barrel and when i press the trigger it gives a short pulse to a buck driver then turns off.

I was thinking i could do this with a 555 timer in monostable mode?

Attached is my diagram, if anyone is familiar in driving mosfets/transistors from a 555 time and could lend a hand it would be great!

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Old 03-11-2014, 10:09 AM #2
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Default Re: Single Pulse Driver Circuit

10 to 100 ohms will work for R=?

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Old 03-11-2014, 10:12 AM #3
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Default Re: Single Pulse Driver Circuit

sweet, i wouldnt know how to match the gate curent to a transistor i pick lol
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Old 03-11-2014, 10:39 AM #4
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Default Re: Single Pulse Driver Circuit

Since it's a DC pulse Rgate can be relatively high, you just don't want to excessively load the 555. R= V/I 50mA is a good ballpark figure. 8.4/0.05 = 168 ohms.

Btw that MOSFET is wired wrong; standard Pinout is GDS, so reverse the center pin and the pin to buck negative. Also don't use a BJT for this as a fet is better for power switching a high current load like a LD driver.

I didn't check your 555 schematic since I don't have monostable retriggerable memorized anymore.


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Old 03-11-2014, 10:41 AM #5
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Default Re: Single Pulse Driver Circuit

i plan on using a IRF1405 MOSFET, so the gate resistor would be to limit current from the 555 timer?
also i think the 555 timer is rated for 200mA output
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Old 03-11-2014, 10:50 AM #6
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Default Re: Single Pulse Driver Circuit

In case you didn't know, that circuit will keep the LD on for as long as the trigger is held closed. if the trigger closes for a very short time, only then will it stay on depending on the set time using the R and C value.
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Old 03-11-2014, 10:55 AM #7
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Default Re: Single Pulse Driver Circuit

yeah, but even if the trigger is pressed multiple times during the first pulse it has no effect. im trying to replicate single shot fire from a gun
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Old 03-11-2014, 10:55 AM #8
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Default Re: Single Pulse Driver Circuit

Yep gate resistors in DC pulse systems are to limit dI/dT and dV/dT on the gate to control EMI generation, ringing, and transients, but in this application you want to limit loading of the signal source. It will slow down the discharge of the gate (not super important since the 555 pulls output to ground on off periods) but you can put a reverse biased diode in parallel with Rgate to quickly discharge the gate for applications where the signal source can't sink current as well. If the signal source can't sink current at all then you need a resistor in parallel with the GS junction to discharge it, but mind then that Rgate forms a voltage divider with Rgs so the values used will be critical to ensure sufficient gate drive and keep the 5RC time constant low enough to ensure quick discharge.


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Old 03-11-2014, 10:57 AM #9
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Default Re: Single Pulse Driver Circuit

wow so much information!
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Old 03-11-2014, 04:07 PM #10
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Default Re: Single Pulse Driver Circuit

Sig drops the Internet on every post and it's written at a physicist's vocabulary. Lol. I have read some of his things to my wife and she just gives me that "your a nerd look Ido learn a lot from them tthough.
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Old 03-11-2014, 04:21 PM #11
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Default Re: Single Pulse Driver Circuit

It may be worth giving this thread a read:
Creating a "One Shot" laser trigger.
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Old 03-11-2014, 04:24 PM #12
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Default Re: Single Pulse Driver Circuit

You can give this circuit a try. It has a cap at the trigger input to limit the pulse length to a minimum so the output will only be a short pulse right at the moment you pull the trigger. I did it in about 5min so the values might need some adjusting but it should work more or less.

It'll be a similar action to a semi automatic gun/rifle. One short pulse after each pull. Adjust RT and CT for your desired pulse length and use the mosfet of your choice that can handle the current.

EDIT: RHD beat me to it and with a similar circuit too.
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Old 03-11-2014, 05:03 PM #13
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Default Re: Single Pulse Driver Circuit

Nice work you two! I was thinking there should be a DC blocking cap added in there somewhere but couldn't remember the proper implementation off the top of my head.

Oh and that's very kind of you Speedy! =)


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Old 03-11-2014, 05:08 PM #14
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Default Re: Single Pulse Driver Circuit

I've used 555's for years. What is the resistor and
diode doing off of the VCC?
I like the addition of the trigger circuit and
Don't use a soft start driver??
HMike
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Old 03-12-2014, 01:56 AM #15
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Default Re: Single Pulse Driver Circuit

It's probably supposed to be an LED and function as a power indicator light
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Old 03-12-2014, 01:58 AM #16
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Default Re: Single Pulse Driver Circuit

Quote:
Originally Posted by djQUAN View Post
It's probably supposed to be an LED and function as a power indicator light
thats correct
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