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Old 03-12-2014, 08:42 AM #17
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Default Re: Single Pulse Driver Circuit

Ok got it working, only problem i have is if i hold the trigger switch on, the output stays on?

How would i make it so that if the trigger is held down longer than the pulse the output turns off?


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Old 03-12-2014, 10:18 AM #18
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Default Re: Single Pulse Driver Circuit

Having no memorable direct experience to advise you with (I usually use a uC for precision one-shot stuff instead of a 555 these days) I've done a bit of searching and found this:


Quote:
The two circuits below illustrate using the 555 timer to close a relay for a predetermined amount of time by pressing a momentary N/O push button. The circuit on the left can be used for long time periods where the push button can be pressed and released before the end of the timing period. For shorter periods, a capacitor can be used to isolate the switch so that only the initial switch closure is seen by the timer input and the switch can remain closed for an unlimited period without effecting the output.
Circuits Page 9

I believe this operates the way the one djQuan posted does, did you try that or just the one in the OP?
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Old 03-12-2014, 05:45 PM #19
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Default Re: Single Pulse Driver Circuit

Quote:
Originally Posted by Fiddy View Post
Ok got it working, only problem i have is if i hold the trigger switch on, the output stays on?

How would i make it so that if the trigger is held down longer than the pulse the output turns off?
That's exactly what I said would happen on post #6. That's why I recommended a circuit I drew on post#12.
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Old 03-12-2014, 11:03 PM #20
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Default Re: Single Pulse Driver Circuit

Quote:
Originally Posted by djQUAN View Post
That's exactly what I said would happen on post #6. That's why I recommended a circuit I drew on post#12.
im sorry, i read your post wrong, thanks for drawing that up djQUAN & RHD
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Old 03-12-2014, 11:35 PM #21
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Default Re: Single Pulse Driver Circuit

that circuit rhd and djQUAN did works nicely, just simulated it on a program,

i put a 10k resistor in series with a 100k pot so the pulse can be set from 110ms to 1.1seconds and if the trigger is held closed it doesnt trigger again or stay on!


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Old 03-13-2014, 02:28 AM #22
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Default Re: Single Pulse Driver Circuit

made messy modifications to my first diagram to bring it up to what rhd and djQUAN drew,

works perfectly, heres the prototype in my M4

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Old 03-13-2014, 03:09 AM #23
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Default Re: Single Pulse Driver Circuit

Good work


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Old 03-13-2014, 03:41 AM #24
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Default Re: Single Pulse Driver Circuit

Glad you got it working
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Old 03-15-2014, 02:28 AM #25
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Default Re: Single Pulse Driver Circuit

My Phaser "toy" nearly toasted the cheep switch.
I tried an IFR510 Mosfet and found the voltage is
too low for operation. I switched to a TIP120 NPN
Darlington BPT and it works OK. That tranisitor
has an hFe of over 1,000.
Fiddy is OK because he is over ~5 volts.
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Old 03-15-2014, 02:32 AM #26
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Default Re: Single Pulse Driver Circuit

Quote:
Originally Posted by Hemlock_Mike View Post
My Phaser "toy" nearly toasted the cheep switch.
I tried an IFR510 Mosfet and found the voltage is
too low for operation. I switched to a TIP120 NPN
Darlington BPT and it works OK. That tranisitor
has an hFe of over 1,000.
Fiddy is OK because he is over ~5 volts.
HMike
haha dam, the N channel im using has a threshold voltage of 4V
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Old 03-15-2014, 03:05 AM #27
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Default Re: Single Pulse Driver Circuit

So do mine but I figured -- "what's 0.3 volts?"
It does make a big difference. My BPT only
cost me 100 mW -- so what ---
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Old 03-15-2014, 03:35 AM #28
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Default Re: Single Pulse Driver Circuit

Use logic level mosfets. Those have Vth of about 1V or so.
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Old 03-15-2014, 03:49 AM #29
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Default Re: Single Pulse Driver Circuit

dQ -----
Really !!!! Our local radio shack doesn't even know... They stock only one and I tried two others which I had. I'll look for one of those and maybe a small IGBT transistor but for now, the darlington is working.
Thanks --- HMike
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Old 03-15-2014, 04:59 AM #30
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Default Re: Single Pulse Driver Circuit

You can also just use a mosfet directly as the current limiter and then control its gate from the 555. Then you don't need to use the buck.
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Old 03-15-2014, 05:19 AM #31
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Default Re: Single Pulse Driver Circuit

RadioShack is a dismal afterimage of what it once was. Not only are components 500% overpriced but the selection doesn't let you do much with what's available.
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Old 03-15-2014, 07:40 AM #32
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Default Re: Single Pulse Driver Circuit

You can find logic level mosfets in old motherboards. It will be a little hard to remove though since the boards are multilayer and would need a considerable amount of heat to remove parts.
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