time off delay

[Relay]

hello all, i want to make a circuit that will turn on a 120VAC soleniod for
a variable length of time(between 3-10 seconds). i have a one shot switch
and a relay with a 12VDC coil. what can i use to keep the soleniod on for
the desired time?

thanks in advance to anyone that offers help.

 

[JeffM]

i want to make a circuit that will turn on a 120VAC soleniod for
a variable length of time(between 3-10 seconds). i have a one shot
switch
and a relay with a 12VDC coil.
Relay

A similar question has been asked hundreds of times before.
This would have been a place to start:
http://groups.google.com/
(Years and years of archived stuff here.)

Here's the answer:
http://groups.google.com/groups?hl=en&lr=lang_en&ie=UTF-8&safe=off&threadm=f8b945bc.0311221414.770cbd3d%40posting.google.com&rnum=2&prev=/groups%3Fnum%3D100%26hl%3Den%26lr%3Dlang_en%26ie%3DISO-8859-1%26safe%3Doff%26q%3Djeff

 

[Dennis Davis]

Relay wrote:

hello all, i want to make a circuit that will turn on a 120VAC soleniod
for a variable length of time(between 3-10 seconds). i have a one shot
switch and a relay with a 12VDC coil. what can i use to keep the soleniod
on for the desired time?

thanks in advance to anyone that offers help.
try a large cap value across the coil 1000mfd for starters,the energy stored

in the cap will go thru the coil when you remove the source voltage.