12VDC Timer, Off The Shelf?

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itolond

Copper - Posts: 87

Joined: February 13, 2016

Location: Singapore

Posted: August 22, 2020 at 5:57 PM / IP Logged

Seeking this for a custom Automotive application - seeking a 12VDC (10A max) timer NO which cycles NC (adjustable delay and NC time) when it receives a 12VDC input - preferable IP67

off the shelf somewhere?

eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: August 23, 2020 at 8:16 PM / IP Logged

You don't state how long a delay you require but this will probably work for you:

https://www.amazon.ca/PAC-TR-7-Universal-Trigger-Output/dp/B0002J22BO/ref=sr_1_1?dchild=1&keywords=pac+tr7&qid=1598231626&sr=8-1

itolond

Copper - Posts: 87

Joined: February 13, 2016

Location: Singapore

Posted: August 23, 2020 at 10:35 PM / IP Logged

Hi and Thanks

delay adjustable from 1-10seconds,

isn't this for car stereos?

itolond

Copper - Posts: 87

Joined: February 13, 2016

Location: Singapore

Posted: August 26, 2020 at 5:49 PM / IP Logged

eguru wrote:

You don't state how long a delay you require but this will probably work for you:

https://www.amazon.ca/PAC-TR-7-Universal-Trigger-Output/dp/B0002J22BO/ref=sr_1_1?dchild=1&keywords=pac+tr7&qid=1598231626&sr=8-1

I did to checking on the unit prescribed (TR7)- seems straight forward but it is not exactly clear to me. Do you know if this can be programmed with 4second on 3 second off cycle or similar?

eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: August 26, 2020 at 8:13 PM / IP Logged

I don't understand what you mean when you talk about an off time. Output will be off after the 4 second on time. Are you wanting some kind of repeating 4 on/3 off as long as the trigger is active?

itolond

Copper - Posts: 87

Joined: February 13, 2016

Location: Singapore

Posted: August 26, 2020 at 8:27 PM / IP Logged

Yes the operation as suggested (a boolean example)

IF Input 12VDC+ energised Then;

Sub output_cycle

Output 12VDC+ energised for 4 seconds,

Output 12VDC+ not energised for 2 seconds

Loop

End sub

Else End

eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: August 27, 2020 at 7:25 AM / IP Logged

Why not just build this with 555 timer (or many derivatives)?

https://www.electroschematics.com/pulse-generator-with-555/

itolond

Copper - Posts: 87

Joined: February 13, 2016

Location: Singapore

Posted: August 27, 2020 at 3:44 PM / IP Logged

That would be a last resort - still need to manager 10A draw as well

itolond

Copper - Posts: 87

Joined: February 13, 2016

Location: Singapore

Posted: August 27, 2020 at 3:52 PM / IP Logged

eguru wrote:

You don't state how long a delay you require but this will probably work for you:

https://www.amazon.ca/PAC-TR-7-Universal-Trigger-Output/dp/B0002J22BO/ref=sr_1_1?dchild=1&keywords=pac+tr7&qid=1598231626&sr=8-1

I take it this unit does not provide for what I need?

eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: August 27, 2020 at 5:26 PM / IP Logged

IDK how to do it with a TR7.

Add a power MOSFET to the example 555 circuit in the link I provided.

A relay won't last very long if you are cycling it twice every 7 seconds.

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