Switch off a motor after some seconds.

[Locrian]

Hello.
I need a circuit to drive a small 12V DC motor.
I want the motor to operate when the circuit is powered on and after
some seconds to stop the motor.
Any idea or circuit ?

Thank you.

 

[Active8]

On 22 Mar 2004 01:03:02 -0800, Locrian wrote:

Hello.
I need a circuit to drive a small 12V DC motor.
I want the motor to operate when the circuit is powered on and after
some seconds to stop the motor.
Any idea or circuit ?

Thank you.

555 one shot and bipolar switch.
--
Best Regards,
Mike

 

[Roy Battell]

In article <44b6ea3a.0403220103.28675d6f@posting.google.com>, Locrian
<locrian@freemail.gr> writes

Hello.
I need a circuit to drive a small 12V DC motor.
I want the motor to operate when the circuit is powered on and after
some seconds to stop the motor.
Any idea or circuit ?

Thank you.

A visit to Terry Pinnell's site index at
http://dspace.dial.pipex.com/terrypin/indexpersonal.html
will reward you with lots of ways of making one-shots
and suggestions for controlling higher loads from logic
level signals.

e.g.
One shot (Increase Ct to increase the time)
http://dspace.dial.pipex.com/terrypin/Images/555OneShot.gif
Drive a relay (or small motor replacing the relay coil)
http://dspace.dial.pipex.com/terrypin/Images/RelayDriver.gif
--
Roy Battell.
To use this address remove the digits included to remove Spam ...
Mail: news@vutrax666.co.uk
URL: http://www.vutrax.co.uk (Vutrax CAD system, FREE up to 256 pins)

 

[Locrian]

Roy Battell <news@vutrax666.co.uk> wrote in message

A visit to Terry Pinnell's site index at
http://dspace.dial.pipex.com/terrypin/indexpersonal.html
will reward you with lots of ways of making one-shots
and suggestions for controlling higher loads from logic
level signals.

Thank you Roy.
Perhaps the circuit i'm looking for is
http://dspace.dial.pipex.com/terrypin/Images/555AutoOff.gif
with an addition of a driver transistor at pin 3 to handle the motor.

Thanks

 

[Ken Moffett]

Locrian wrote:

Hello.
I need a circuit to drive a small 12V DC motor.
I want the motor to operate when the circuit is powered on and after
some seconds to stop the motor.
Any idea or circuit ?

Thank you.

I've used this circuit:

http://ourworld.compuserve.com/homepages/Bill_Bowden/page2.htm#relay_i.gif

as part of a control unit to keep my shop's dust collector system running for a few
seconds after I power down my table saw. Works as advertised.

 

[Terry Pinnell]

locrian@freemail.gr (Locrian) wrote:

Roy Battell <news@vutrax666.co.uk> wrote in message
A visit to Terry Pinnell's site index at
http://dspace.dial.pipex.com/terrypin/indexpersonal.html
will reward you with lots of ways of making one-shots
and suggestions for controlling higher loads from logic
level signals.


Thank you Roy.
Perhaps the circuit i'm looking for is
http://dspace.dial.pipex.com/terrypin/Images/555AutoOff.gif
with an addition of a driver transistor at pin 3 to handle the motor.

No, I think you'd be better off adapting this one I posted in response
to similar enquiry a couple of years ago:
http://www.terrypin.dial.pipex.com/Images/555TimerDelayedOff.gif

In its present form, that gives a mono which is triggered by power-up
times out after about 30 s, and drives its load of up to 200 mA
directly or (as shown) via a realy, using the same power supply.

So the changes you'd probably want to make are:
1. Alter R and/or C to get time you want (or make R a pot or preset in
series with say 10k, to make it adjustable).
2. Use a separate power supply for the motor, via the N/O relay
contacts.
3. Or use a MOSFET as the driver stage instead, as shown in
http://www.terrypin.dial.pipex.com/Images/555DelayedOff.gif

--
Terry Pinnell
Hobbyist, West Sussex, UK

 

[Locrian]

Terry Pinnell <terrypin@dial.pipex.com> wrote in message

No, I think you'd be better off adapting this one I posted in response
to similar enquiry a couple of years ago:
http://www.terrypin.dial.pipex.com/Images/555TimerDelayedOff.gif

OK.
I think it is almost the same circuit with some differents at the
output.

So the changes you'd probably want to make are:
1. Alter R and/or C to get time you want (or make R a pot or preset in
series with say 10k, to make it adjustable).
I have already done this.

2. Use a separate power supply for the motor, via the N/O relay
contacts.
Why i need a seperate power supply ?

Is there a problem to the timer (555) by the motor if i use the same
power supply ?

Anyway, i have already build that circuit with successful.
I need that circuit for a diy aquarium fish feeder.
The next step is to build an 24 hour timer, to trigger the feeder.
The main proccess of the 24 hour timer is to on/off a relay to drive
the 555TimerDelayedOff circuit.
So i need an additional circuit to make that job.
A push button which when pressed will open a relay, and when pressed
again will close the relay, when pressed again will open the relay,
and so on.
Is there a circuit for this ?

Thank you all of you for respont.
You have help me very much.