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Have a look at the following... From http://www.ozitronics.com

K141 - Multi-Mode Timer
The kit contains seven different timing modes using only ONE IC and some support 
components on a single-sided PCB. Opto-isolated trigger input and relay output.

Timing Modes:
1. Instant On, Delayed Off, Level triggered
2. Instant On, Delayed Off, Edge triggered
3. Delayed On
4. Instant On and Hold, Delayed Off
5. Toggling
6. Instant On, Delayed Off, with Pause
7. Delayed On with Pause

Delay Ranges:
1. 1 - 255 seconds in steps of 1 second
2. 10 - 2550 seconds (42min 30sec) in steps of 10 seconds
3. 1 - 255 minutes (4hr 15min) in 1 minute steps
4. 10 - 2550 minutes (42hr 30min) in 10 minutes steps

The timing modes and delay ranges are selected by on-board DIP switches. There 
is provision for another timer mode. If you can think of another timer variation 
(or even a completely different set of timing modes) then let us know - it's 
only a software change! Various triggering options available (see 
documentation). 12VDC operation. 96 x 48mm - (3 3/4" x 1 7/8") PCB.

Featured in April 2002 issue of Silicon Chip

John Waters wrote:
> Hi All,
> 
> I need a timer to turn on/off a small aquarium air pump, but cost is 
> very sensitive while accuracy is not a problem, could anyone suggest me 
> a cheap solution? it could be a circuit, an off-the-shelf product, or 
> whatever method, as long as it is cheap! I need only one on/off interval 
> - once every hour (just roughly will do), each time turn on for about 5 
> minutes. It would be perfect if the on/off interval can be swtichable to 
> once every ten hours (again on for around 5 minutes) as well. If it is 
> not possible to have such a long or switchable delay, just once on/off 
> interval every hour will be ok.
> 
> Thanks in advance!
> 
> John
> 
> 

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