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258 posts

Ultimate Geek
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Topic # 233872 7-May-2018 16:59
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Still haven’t managed to track down a countdown timer. Paid about $6 for one from Ali Express but can’t get it to work.
What I want is a unit to set say at 20 minutes that turns whatever OFF in that time.
When the power is applied to the unit again it turns off again in the 20 minutes.
Any suggestions?
Many thanks




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Glurp
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  Reply # 2009410 7-May-2018 17:30
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There ought to be Jaycar kits that can do that if you don't mind some soldering. I don't know offhand of any commercial products but this is a pretty simple timer IC function. 

 

 





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453 posts

Ultimate Geek
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  Reply # 2009432 7-May-2018 18:13
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do you need the timer to give the device time to shut off in that 20 mins or after 20mins the power is cut and the unit is off?

 

i might be reading the post wrong, apologies in advance......


 
 
 
 


369 posts

Ultimate Geek
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  Reply # 2009459 7-May-2018 19:04
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Is a standard light switch timer not suitable?
https://nz.rs-online.com/web/p/timer-switches/0490194/

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Uber Geek
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  Reply # 2009593 7-May-2018 20:51
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stuffed: Still haven’t managed to track down a countdown timer. Paid about $6 for one from Ali Express but can’t get it to work.

What I want is a unit to set say at 20 minutes that turns whatever OFF in that time.

When the power is applied to the unit again it turns off again in the 20 minutes.

Any suggestions?

Many thanks



I have an analogue timer plug (has a dial like an old rotary phone). You just twist it to 20 minutes or up to 3 hours and it turns off after that time. I used it to charge old nicad batteries for RC cars. Got it from Bunnings (don't see it on the website).

Pretty sure it's made by HPM. Took me ages to track one down so good luck.

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  Reply # 2009597 7-May-2018 20:54
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It's the one at the bottom of this page, not sure if you can still get them.

http://dongrayelectricalsupplies.com.au/product-category/timers-counters/domestic-plug-in-timers/

741 posts

Ultimate Geek
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  Reply # 2009611 7-May-2018 21:05
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If you end up with the right timer but it switches on when you want off, or vice versa, you can use a relay to invert the function.

 

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276 posts

Ultimate Geek
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  Reply # 2013369 10-May-2018 13:28
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stuffed: Still haven’t managed to track down a countdown timer. Paid about $6 for one from Ali Express but can’t get it to work.
What I want is a unit to set say at 20 minutes that turns whatever OFF in that time.
When the power is applied to the unit again it turns off again in the 20 minutes.
Any suggestions?
Many thanks

 

 

 

This timer here will do it - it has a countdown mode that should do what you want it to.

 

https://www.mitre10.co.nz/shop/hpm-digital-time-slimline-240v-white/p/180955




258 posts

Ultimate Geek
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  Reply # 2013388 10-May-2018 13:37
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Thanks for that and will have a look at it.




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