Moderator's note: This post was split off of https://forum.allaboutcircuits.com/...y-and-dc-to-dc-step-down.144411/#post-1264464 to create this new thread.

I have a similar question. I need a step down converter from 12v to 5v with a built in time delay.

AnalogKid for my circuit:
1. The source would be a nominal 12v DC and GND from a vehicle battery/charging system with a voltage range from 11.8v up to 14.8v DC.
2. Load side would be 5v DC to power a LED pixel controller and LED pixels.
3. Current would be up to 10A of draw.
In my case I am looking at time delay relay that will have constant power to it and a 12v signal that would trigger the time delay relay to turn on then a step down in voltage to power the LED pixel controller and LED's

Thanks!

 

You can do this with a 555 timer and buck down converter chip, any automotive 10amp relay will do., what time delay do you need?


Buck down converter ....
https://m.banggood.com/DC-DC-Buck-C...MI4LzntLvc2gIVz7DtCh2QeAC9EAQYASABEgK9L_D_BwE

 

hi Hilo,
What time delay period is required, fixed/variable , single shot or recycling.?
Is that 5V at 10Amp.?
E

 

You can do this with a 555 timer and buck down converter chip, any automotive 10amp relay will do., what time delay do you need?


Buck down converter ....
https://m.banggood.com/DC-DC-Buck-C...MI4LzntLvc2gIVz7DtCh2QeAC9EAQYASABEgK9L_D_BwE

I would opt for a variable time delay as I have not come up with my lighting scheme/sequence yet.

hi Hilo,
What time delay period is required, fixed/variable , single shot or recycling.?
Is that 5V at 10Amp.?
E

Variable time delay as noted above. Not sure about single shot or recycling. 10A at 5V is on the high side as I just want to make sure I have the current available in case my lighting scheme changes.

A little more information on what Im doing. The lights will be triggered by the 12V blinker single from the car. I would like the delay relay to stay on as long as its keeps getting signal from the blinker of the car. Once the blinker cycle is finished a predetermined time (variable) that it will stay on before it shuts off. Im not sure what the timing will be as I still need to come up with my lighting pattern and figure out the amount of time I need delayed in order for it to go through a full cycle of the pattern.

Thanks!

 

figure out the amount of time I need delayed in order for it to go through a full cycle of the pattern.

How about, once the cycle starts, having the circuit automatically stay on until the cycle has finished?

What will control the cycle sequence?

 

How about, once the cycle starts, having the circuit automatically stay on until the cycle has finished?

What will control the cycle sequence?

This is what I am planning to use to control the pixel LED's
https://www.nledshop.com/index.php?main_page=product_info&cPath=1&products_id=75

 

I actually have a time delay that is in the car now doing sort of what I am looking for. But it has no time delay adjustment or voltage step down.

Sorry its in Nihongo (Japanese)
http://shinem.jp/shopdetail/004000000001/

So my other option is to buy another module like that and a buck converter and stick it in a box with the LED pixel controller. But I'm hoping to simply things and not have so many separate components.

Thanks!

 

So my other option is to buy another module like that and a buck converter and stick it in a box with the LED pixel controller. But I'm hoping to simply things and not have so many separate components.

That's probably true.
You have three distinct functions, and it's not likely you will find them in a single package unless you build it yourself, and that's a reasonably complex project.