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Looking for a circuit that when you press a button powers t

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jskiba(at)icosa.net
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Posted: Sat Sep 14, 2013 11:31 am Post subject: Looking for a circuit that when you press a button powers t

Sorry for the bad specs, let me try again



Functions:

Press a momentary switch device turns on release same switch device turns off (even if shorter than the below set time)

Press same switch and hold for more than x time say 2 or 3 seconds (would like that to be adjustable if Possible) the device will only be on for the max set time even if button still held, to get device on again you would have to release button and press again.

Do not care if solid state or relay, would probably prefer solid state, ultimately looking for simple and CHEAP to build or buy.

This needs to run off 12-14 volts



Hope that clears things up ?



Jeff.

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enginerdy(at)gmail.com
Guest

Posted: Sat Sep 14, 2013 11:49 am Post subject: Looking for a circuit that when you press a button powers t

.a circuit that will only be on for 3 seconds maximum, even if you're still holding down the button. If you let go early, it turns off early. Do I have that right?



What is the load you're driving? How much current?



Daniel



On Sep 14, 2013, at 2:30 PM, Jeffrey Skiba <jskiba(at)icosa.net> wrote:



[quote] 

 

 Sorry for the bad specs, let me try again

 

 Functions:

 Press a momentary switch device turns on release same switch device turns off (even if shorter than the below set time)

 Press same switch and hold for more than x time say 2 or 3 seconds (would like that to be adjustable if Possible) the device will only be on for the max set time even if button still held, to get device on again you would have to release button and press again.

 Do not care if solid state or relay, would probably prefer solid state, ultimately looking for simple and CHEAP to build or buy.

 This needs to run off 12-14 volts

 

 Hope that clears things up ?

 

 Jeff.

 

 

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Bob McC

Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON

Posted: Sat Sep 14, 2013 12:19 pm Post subject: Looking for a circuit that when you press a button powers t

Jeff;  

   

Momentary normally open pushbutton in series with a timer which opens the load after the preset delay time. Because button is momentary and in series with the load and the timer, it must be held to power the load for any period of time. Any time it is released the load loses power. The timer opens the load after the preset delay even if the button is still maintained. Releasing the button resets the timer whether or not it has timed out.  

Provides exactly the functionality you describe. One example of such a timer is Omron H3RN-1 which is available in 12 VDC (also 24 VAC and 24 VDC) and in 2 timing ranges from .1 sec to 10 min OR .1 min to 10 HR. This particular timer will switch a resistive load of 3 amps up to 250 Volts. Spec sheet found here; http://tinyurl.com/mruy73u  

This is a plug in solid state timer with a relay output (SPDT)  

   

Bob McC  

   

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Bob McC
Falco #908
(just starting)

stein(at)steinair.com
Guest

Posted: Sat Sep 14, 2013 12:51 pm Post subject: Looking for a circuit that when you press a button powers t

I know this this probably doesn't exactly fit your "cheap" requirement, but

I'm guessing it's pretty close to what you're trying to do here.  By the

time you round up all the components and put some of your own time into it,

I'd bet you'd be close to this anyway (as far as time/money goes):



http://tcwtech.com/safety_trim.html#features



Cheers,



Stein 



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kuffel(at)cyberport.net
Guest

Posted: Sun Sep 15, 2013 7:10 am Post subject: Looking for a circuit that when you press a button powers t

Jeff,



Exactly the circuit you describe for two axis trim and two pilot control was 

published by me in the June 2013 Kitplanes magazine.



If you leave out the fancy external (safety feature) controls and the 

variable speed capability the parts cost (including 8 amp relays) is less 

than $15.  This compares well with the commercial unit Stein mentioned.



If you don't have access to the Kitplanes Magazine E-Library I can email you 

pdf files of the schematic and the perfboard layout as well as the Bill of 

Materials.



Tom

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