[PSUBS-MAILIST] PSUBS light project status

Sat Jul 9 16:58:17 EDT 2016

Alan,

No,

None of the parts gets near 70C or 75C, only the Varo LED.

The remainder of the parts should not see much more than about 45C.

The LM239 should stay about 5 degrees above the ambient. It’s one of the lowest temperature rise parts on the design.

Hope this helps,

Ken

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan via Personal_Submersibles
Sent: Saturday, July 09, 2016 2:47 PM
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] PSUBS light project status

So the LM393N rated to 70C may malfunction before the 

thermal protection cuts in at 75C?

Alan

Sent from my iPad

On 10/07/2016, at 2:48 am, Ken Martindale via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > wrote:

Correction, shuts off at 75C.

Ken

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan via Personal_Submersibles
Sent: Friday, July 08, 2016 9:25 PM
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> >
Subject: Re: [PSUBS-MAILIST] PSUBS light project status

Yes I did briefly.

Thanks for that, it represents a lot of work. Wish I was as talented.

I saw you were using an LM393N that is rated to 70 C whereas there seems to be other

similar products rated to 105 C. Is there a suitable alternative with the higher temperature

rating? The Vero 29 has a max rating of 105 C., am wondering what component

is the lowest denominator as far as temperature is concerned?

Cheers Alan

Sent from my iPad

On 9/07/2016, at 12:44 pm, Ken Martindale via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > wrote:

I take it you looked at the schematic?

Ken

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan via Personal_Submersibles
Sent: Friday, July 08, 2016 5:58 PM
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> >
Subject: Re: [PSUBS-MAILIST] PSUBS light project status

Thanks Ken,

Ouch, that's a lot of components to try & pack in to the back

of the housing & keep cool. I guess that's what happens when

you are designing a generic unit.

Also the Vero 29 operating voltage doesn't help, as you need to

build a buck / boost system for the varying sub voltages.

Was reading that the European electric car manufacturers are

agreeing on a standardised 48V system. Perhaps there will be some

spin offs for submarines that adopt 48V, like off the shelf led drivers,

cheap charging / battery monitoring systems, battery packs etc.

Cheers Alan

Sent from my iPad

On 9/07/2016, at 7:55 am, Ken Martindale via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > wrote:

Alan,

I think it’s on a project page and it’s existing now.

Take a look.

Ken

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan via Personal_Submersibles
Sent: Friday, July 08, 2016 3:19 PM
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> >
Subject: Re: [PSUBS-MAILIST] PSUBS light project status

Thanks Ken,

look forward to the circuit diagram.

Alan

Sent from my iPad

On 9/07/2016, at 1:39 am, Ken Martindale via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > wrote:

Alan,

The simplest thing to do with my design is to change one of the resistor values for the current required by the Vero or any other LED with the same current.

This resistor controls the current through the LEDs and is independent of the input voltage and within certain limits independent of the LEDs forward voltage.

Thanks,

Ken

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan via Personal_Submersibles
Sent: Thursday, July 07, 2016 8:44 PM
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> >
Subject: Re: [PSUBS-MAILIST] PSUBS light project status

Hi Ken,

I am running a 48V system & haven't found a suitable led driver

for that input that will run the vero 29 or other 36V leds. 

Would it be difficult to adapt your driver design to a 48V input?

I was looking at this switch mode regulator as a possible candidate.

http://www.ti.com.cn/cn/lit/ds/symlink/lm2593hv.pdf

I believe you are designing a boost / buck system. I am not sure how much

extra circuitry is involved in the boost side. Will it be possible to

simply eliminate the boost circuitry when copying your design?

Cheers Alan

Sent from my iPad

On 8/07/2016, at 4:12 am, Ken Martindale via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > wrote:

Thanks Cliff,

Can you send me your off line E-mail address?

Thanks,

Ken

wmartindale at cfl.rr.com <mailto:wmartindale at cfl.rr.com> 

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Cliff Redus via Personal_Submersibles
Sent: Wednesday, July 06, 2016 7:24 PM
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> >
Subject: Re: [PSUBS-MAILIST] PSUBS light project status

Ken, good news on all fronts.  Welcome back.

Cliff

On Wed, Jul 6, 2016 at 3:31 PM, Ken Martindale via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > wrote:

To all,

My wife has been cleared of cancer and I’ll be back on the LED project, starting tomorrow.

Sorry to drop out for so long,

Ken Martindale

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org <mailto:personal_submersibles-bounces at psubs.org> ] On Behalf Of Cliff Redus via Personal_Submersibles
Sent: Friday, July 01, 2016 10:40 PM
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> >
Subject: Re: [PSUBS-MAILIST] PSUBS light project status

Alec, I was doing the 1 arm can for the light and Ken was doing the electronics.  Ken bailed out so unless someone steps up to take over the LED driver side of the project, we are dead in the water.  If someone could source a small OTS LED driver, I could go forward.  

On Friday, July 1, 2016, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > wrote:

Hi gents,

I have an almost-ready sub but no lights, so was wondering whether to make them per the PSUBS-designed model in the community projects section of the website. I'm in awe of those drawings! However, they show a printed wiring board that is a placeholder for a part still to be designed. I was wondering if that might have happened, or if there might be an ETA?  

Thanks,

Alec

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