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Power Control for Heated Seats

 
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jluckey(at)pacbell.net
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PostPosted: Sun Aug 20, 2023 12:22 pm    Post subject: Power Control for Heated Seats Reply with quote

Listers,
I want to have some control over the temperature of heated seats in an RV-14.
I am considering 2 types of circuit:
1. a high-power linear regulator like a LM138
or
2. a low frequency (maybe 50 Hz) PWM circuit (maybe a 555) driving an FET; 

I don't think any kind of thermostatic control is practical or necessary (but I'm open to suggestions).
The heater(s) consist of 2 pads, one for the seat and one for the lower back. In total they draw 6 amps at 12v.


TIA,
Jeff Luckey
KCMA


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Ceengland



Joined: 11 Oct 2020
Posts: 389
Location: MS

PostPosted: Sun Aug 20, 2023 12:44 pm    Post subject: Power Control for Heated Seats Reply with quote

On 8/20/2023 3:22 PM, Jeff Luckey wrote:

Quote:
Listers,


I want to have some control over the temperature of heated seats in an RV-14.


I am considering 2 types of circuit:
1. a high-power linear regulator like a LM138
or
2. a low frequency (maybe 50 Hz) PWM circuit (maybe a 555) driving an FET; 



I don't think any kind of thermostatic control is practical or necessary (but I'm open to suggestions).


The heater(s) consist of 2 pads, one for the seat and one for the lower back.  In total they draw 6 amps at 12v.




TIA,


Jeff Luckey
KCMA


The ones (ama-bay specials) I bought for my RV6 came with variable controls for each seat.

FWIW,
Charlie
Virus-free.www.avast.com[url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2] [/url]


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nuckolls.bob(at)aeroelect
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PostPosted: Sun Aug 20, 2023 5:08 pm    Post subject: Power Control for Heated Seats Reply with quote

At 03:22 PM 8/20/2023, you wrote:
Quote:
Listers,

I want to have some control over the temperature of heated seats in an RV-14.

I am considering 2 types of circuit:
1. a high-power linear regulator like a LM138
or
2. a low frequency (maybe 50 Hz) PWM circuit (maybe a 555) driving an FET;

I don't think any kind of thermostatic control is practical or necessary (but I'm open to suggestions).

The heater(s) consist of 2 pads, one for the seat and one for the lower back. In total they draw 6 amps at 12v.


I've used these for fan motor control on
vehicles. The price is right and they're
pretty compact.

https://tinyurl.com/4caahvz4






Bob . . .

////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================

In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.


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jluckey(at)pacbell.net
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PostPosted: Sun Aug 20, 2023 10:11 pm    Post subject: Power Control for Heated Seats Reply with quote

Bob,
Does the knob "click off"?  It says something like that somewhere on the web page it's not exactly clear.
And you're right, at that price it would be hard to go wrong.... I've got a couple of things around here that I would like to control the speed... and a nichrome wire cutter, and a ... 

Thx

On Sunday, August 20, 2023 at 06:20:18 PM PDT, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com> wrote:

At 03:22 PM 8/20/2023, you wrote:

Listers,

I want to have some control over the temperature of heated seats in anRV-14


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nuckolls.bob(at)aeroelect
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PostPosted: Wed Aug 23, 2023 8:19 am    Post subject: Power Control for Heated Seats Reply with quote

At 01:10 AM 8/21/2023, you wrote:
Quote:
Bob,

Does the knob "click off"? It says something like that somewhere on the web page it's not exactly clear.


Yes, they have an on/off switch at max CCW rotation


Bob . . .

////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================

In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.


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jluckey(at)pacbell.net
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PostPosted: Wed Aug 23, 2023 10:18 am    Post subject: Power Control for Heated Seats Reply with quote

Thanks Bob. I just ordered one to test.


-Jeff


On Wednesday, August 23, 2023 at 09:31:42 AM PDT, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com> wrote:




At 01:10 AM 8/21/2023, you wrote:
Quote:
Bob,

Does the knob "click off"? It says something like that somewhere on the web page it's not exactly clear.


Yes, they have an on/off switch at max CCW rotation


Bob . . .

////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================

In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.


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