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12VDC Timer, Off The Shelf?

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=146408
Printed Date: October 19, 2021 at 4:43 AM


Topic: 12VDC Timer, Off The Shelf?

Posted By: itolond
Subject: 12VDC Timer, Off The Shelf?
Date Posted: August 22, 2020 at 5:57 PM

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?



Replies:

Posted By: eguru
Date Posted: August 23, 2020 at 8:16 PM
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




Posted By: itolond
Date Posted: August 23, 2020 at 10:35 PM
Hi and Thanks

delay adjustable from 1-10seconds,

isn't this for car stereos?




Posted By: itolond
Date Posted: August 26, 2020 at 5:49 PM
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?




Posted By: eguru
Date Posted: August 26, 2020 at 8:13 PM
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?




Posted By: itolond
Date Posted: August 26, 2020 at 8:27 PM
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




Posted By: eguru
Date Posted: August 27, 2020 at 7:25 AM
Why not just build this with 555 timer (or many derivatives)?

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




Posted By: itolond
Date Posted: August 27, 2020 at 3:44 PM
That would be a last resort - still need to manager 10A draw as well




Posted By: itolond
Date Posted: August 27, 2020 at 3:52 PM
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?




Posted By: eguru
Date Posted: August 27, 2020 at 5:26 PM
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.




Posted By: itolond
Date Posted: August 28, 2020 at 1:49 AM
with the 555 Pulse Generator Circuit,

what is needed to ensure i can power with a Auto 11-14VDC input?





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