ic waterspray delay

[Pappu1]

i was installing a ic water spray in a mates wrx and was wonderinf if anyone had a simple circuit on how to have the water motor on for like 3 seconds with a single push of the spray button like in the factory sti.

at the moment its on for only as long as u push the button for the spray.

cheers.

[mattapo]

look at teh jaycar website

[DRFVDR]

http://www.hella.co.nz/?t=9&pcid=497&sct=1&pid=791&View=Full

just use one of these

[Pappu1]

 DRFVDR said:

http://www.hella.co.nz/?t=9&pcid=497&sct=1&pid=791&View=Full

just use one of these

brilliant!!!!!

[Pappu1]

 pappu']

[quote name='DRFVDR said:

url]http://www.hella.co.nz/?t=9&pcid=497&sct=1&pid=791&View=Full[/url]

just use one of these

brilliant!!!!!

ouch that hella one is bleeding expensive..like $108 dammm

better see the jaycar site perhaps

[suubyduuby]

You might be interested in having a look at this:

http://autospeed.com/cms/title_Intelligent-Intercooler-Water-Spray-Part-1/A_0527/article.html

[Durty-Sanchez]

A simple RC circuit would do the trick here...

1. Push button to charge cap and start pump.

2. Release button to let cap discharge through (variable) resistor.

3. Cap discharges over time period t, at which point the voltage has dropped so much that the pump goes off

If you use a variable resistor on the discharge circuit you can alter how long it takes to discharge the cap (which is how long the pump stays on for). Just hook the cap voltage up to a FET load driver of some kind and it'd work a treat

[Pappu1]

 Durty-Sanchez said:

A simple RC circuit would do the trick here...

1. Push button to charge cap and start pump.

2. Release button to let cap discharge through (variable) resistor.

3. Cap discharges over time period t, at which point the voltage has dropped so much that the pump goes off

If you use a variable resistor on the discharge circuit you can alter how long it takes to discharge the cap (which is how long the pump stays on for). Just hook the cap voltage up to a FET load driver of some kind and it'd work a treat

wud u know what sort of circuit i wud need to say do a 3 or 4 secont time lapse?

what about a 10 sec one.

how do i put the FET in there lol.. not too clued up on that one.. but m sure need it to drive the pump relay right?

[suubyduuby]

Here you go:

12V 3A Timer Module 2 Seconds to 10 minutes -- Jaycar Electronics.

RRP $41.90

http://www.jaycar.co.nz/productView.asp?ID=AA0364&keywords=timer&form=KEYWORD

Alternatively, you could get a flextimer circuit kit:

http://www.jaycar.co.nz/productView.asp?ID=KA1732&keywords=timer&form=KEYWORD

And hook it up to a simple automotive relay:

http://www.jaycar.co.nz/productView.asp?ID=SY4070&keywords=spdt+relay&form=KEYWORD

[Durty-Sanchez]

You'd need to pick a FET and get it's on/off gate voltage, then pick a RC pair (or variable resistor region) that best suits... etc. I'd just get the jaycar one, it comes in a cool box and everything!

 pappu']

[quote name='Durty-Sanchez said:

A simple RC circuit would do the trick here...

1. Push button to charge cap and start pump.

2. Release button to let cap discharge through (variable) resistor.

3. Cap discharges over time period t, at which point the voltage has dropped so much that the pump goes off

If you use a variable resistor on the discharge circuit you can alter how long it takes to discharge the cap (which is how long the pump stays on for). Just hook the cap voltage up to a FET load driver of some kind and it'd work a treat

/quote]

wud u know what sort of circuit i wud need to say do a 3 or 4 secont time lapse?

what about a 10 sec one.

how do i put the FET in there lol.. not too clued up on that one.. but m sure need it to drive the pump relay right?

[subieboy]

 mattapo said:

look at teh jaycar website

+ 1