Rocksolid Light

Welcome to novaBBS (click a section below)

mail  files  register  newsreader  groups  login

Message-ID:  

<Stealth> How do I bind a computer to an NIS server? <Joey> Use a rope? -- Seen on #Debian

tech / sci.electronics.design / Re: Is 3 Watts really too much to ask?

SubjectAuthor
* Re: Is 3 Watts really too much to ask?amdx
`* Re: Is 3 Watts really too much to ask?amdx
 `* Re: Is 3 Watts really too much to ask?Rick C
  `- Re: Is 3 Watts really too much to ask?amdx

1
Re: Is 3 Watts really too much to ask?

<sr4ima$ngi$1@dont-email.me>

  copy mid

https://www.novabbs.com/tech/article-flat.php?id=86818&group=sci.electronics.design#86818

  copy link   Newsgroups: sci.electronics.design
Path: i2pn2.org!i2pn.org!eternal-september.org!reader02.eternal-september.org!.POSTED!not-for-mail
From: amd...@knology.net (amdx)
Newsgroups: sci.electronics.design
Subject: Re: Is 3 Watts really too much to ask?
Date: Wed, 5 Jan 2022 10:57:46 -0600
Organization: A noiseless patient Spider
Lines: 28
Message-ID: <sr4ima$ngi$1@dont-email.me>
References: <r7i2gr$al9$5@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Injection-Date: Wed, 5 Jan 2022 16:57:47 -0000 (UTC)
Injection-Info: reader02.eternal-september.org; posting-host="56046682797173613119ccf74e139d19";
logging-data="24082"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/Kz8BwhmnAJ6vfocCdBhCe"
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
Thunderbird/91.4.1
Cancel-Lock: sha1:hS7mmzoqANS7IltyrNXcY9hOyro=
In-Reply-To: <r7i2gr$al9$5@dont-email.me>
X-Antivirus-Status: Clean
Content-Language: en-US
X-Antivirus: Avast (VPS 220105-6, 1/5/2022), Outbound message
 by: amdx - Wed, 5 Jan 2022 16:57 UTC

On 4/19/2020 12:41 PM, Cursitor Doom wrote:
> Gentlemen,
>
> in pursuance of what is turning out to be a jinxed project (installing a
> dashcam) I'm attempting to drop 14.5V (the normal battery voltage whilst
> the engine is running) to 5V for the camera. The camera draws at most
> 300mA so the regulator (an L7805CV) shouldn't find that task too much of
> a struggle, since it only has to disspate just under 3 Watts by my
> reckoning. I'd have thought this reasonably large heatsink (see 20p piece
> for scale comparison) would be overkill. Unfortunately it isn't, though.
> Even with a low ambient temp of about 65'F it gets a bit too hot to touch
> after a few minutes, so once in the car in a couple of months with a
> T_amb north of 100'F, it hasn't a hope in hell of preventing the reg from
> going up in smoke.
> Apart from advising me to permanantly give up electronics, has anyone got
> any constructive suggestions to make here?
> TIA.

A series 20Ω 5 watt resistor between the 14.5V and the 5 V regulator
would move a lot of that heat.

                                            Mikek

--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

Re: Is 3 Watts really too much to ask?

<sr4ipi$ngi$2@dont-email.me>

  copy mid

https://www.novabbs.com/tech/article-flat.php?id=86819&group=sci.electronics.design#86819

  copy link   Newsgroups: sci.electronics.design
Path: i2pn2.org!i2pn.org!eternal-september.org!reader02.eternal-september.org!.POSTED!not-for-mail
From: amd...@knology.net (amdx)
Newsgroups: sci.electronics.design
Subject: Re: Is 3 Watts really too much to ask?
Date: Wed, 5 Jan 2022 10:59:30 -0600
Organization: A noiseless patient Spider
Lines: 38
Message-ID: <sr4ipi$ngi$2@dont-email.me>
References: <r7i2gr$al9$5@dont-email.me> <sr4ima$ngi$1@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Injection-Date: Wed, 5 Jan 2022 16:59:30 -0000 (UTC)
Injection-Info: reader02.eternal-september.org; posting-host="56046682797173613119ccf74e139d19";
logging-data="24082"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18sWG5716oKWwGigAO7IdZ0"
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
Thunderbird/91.4.1
Cancel-Lock: sha1:0iC7f0DF6y53fhjGHsndNnGLAao=
In-Reply-To: <sr4ima$ngi$1@dont-email.me>
X-Antivirus-Status: Clean
Content-Language: en-US
X-Antivirus: Avast (VPS 220105-6, 1/5/2022), Outbound message
 by: amdx - Wed, 5 Jan 2022 16:59 UTC

On 1/5/2022 10:57 AM, amdx wrote:
> On 4/19/2020 12:41 PM, Cursitor Doom wrote:
>> Gentlemen,
>>
>> in pursuance of what is turning out to be a jinxed project (installing a
>> dashcam) I'm attempting to drop 14.5V (the normal battery voltage whilst
>> the engine is running) to 5V for the camera. The camera draws at most
>> 300mA so the regulator (an L7805CV) shouldn't find that task too much of
>> a struggle, since it only has to disspate just under 3 Watts by my
>> reckoning. I'd have thought this reasonably large heatsink (see 20p
>> piece
>> for scale comparison) would be overkill. Unfortunately it isn't, though.
>> Even with a low ambient temp of about 65'F it gets a bit too hot to
>> touch
>> after a few minutes, so once in the car in a couple of months with a
>> T_amb north of 100'F, it hasn't a hope in hell of preventing the reg
>> from
>> going up in smoke.
>> Apart from advising me to permanantly give up electronics, has anyone
>> got
>> any constructive suggestions to make here?
>> TIA.
>
> A series 20Ω 5 watt resistor between the 14.5V and the 5 V regulator
> would move a lot of that heat.
>
>                                             Mikek
>
>
Oh, I see Ricky C beat me to it.

                              Mikek

--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

Re: Is 3 Watts really too much to ask?

<6cb606ae-ca8d-4554-ab86-42299d1042fbn@googlegroups.com>

  copy mid

https://www.novabbs.com/tech/article-flat.php?id=86889&group=sci.electronics.design#86889

  copy link   Newsgroups: sci.electronics.design
X-Received: by 2002:a37:6113:: with SMTP id v19mr40542184qkb.333.1641440609963;
Wed, 05 Jan 2022 19:43:29 -0800 (PST)
X-Received: by 2002:a25:2c11:: with SMTP id s17mr65494338ybs.7.1641440609773;
Wed, 05 Jan 2022 19:43:29 -0800 (PST)
Path: i2pn2.org!i2pn.org!weretis.net!feeder6.news.weretis.net!news.misty.com!border2.nntp.dca1.giganews.com!nntp.giganews.com!news-out.google.com!nntp.google.com!postnews.google.com!google-groups.googlegroups.com!not-for-mail
Newsgroups: sci.electronics.design
Date: Wed, 5 Jan 2022 19:43:29 -0800 (PST)
In-Reply-To: <sr4ipi$ngi$2@dont-email.me>
Injection-Info: google-groups.googlegroups.com; posting-host=162.12.231.45; posting-account=I-_H_woAAAA9zzro6crtEpUAyIvzd19b
NNTP-Posting-Host: 162.12.231.45
References: <r7i2gr$al9$5@dont-email.me> <sr4ima$ngi$1@dont-email.me> <sr4ipi$ngi$2@dont-email.me>
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <6cb606ae-ca8d-4554-ab86-42299d1042fbn@googlegroups.com>
Subject: Re: Is 3 Watts really too much to ask?
From: gnuarm.d...@gmail.com (Rick C)
Injection-Date: Thu, 06 Jan 2022 03:43:29 +0000
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Lines: 48
 by: Rick C - Thu, 6 Jan 2022 03:43 UTC

On Wednesday, January 5, 2022 at 11:59:36 AM UTC-5, amdx wrote:
> On 1/5/2022 10:57 AM, amdx wrote:
> > On 4/19/2020 12:41 PM, Cursitor Doom wrote:
> >> Gentlemen,
> >>
> >> in pursuance of what is turning out to be a jinxed project (installing a
> >> dashcam) I'm attempting to drop 14.5V (the normal battery voltage whilst
> >> the engine is running) to 5V for the camera. The camera draws at most
> >> 300mA so the regulator (an L7805CV) shouldn't find that task too much of
> >> a struggle, since it only has to disspate just under 3 Watts by my
> >> reckoning. I'd have thought this reasonably large heatsink (see 20p
> >> piece
> >> for scale comparison) would be overkill. Unfortunately it isn't, though.
> >> Even with a low ambient temp of about 65'F it gets a bit too hot to
> >> touch
> >> after a few minutes, so once in the car in a couple of months with a
> >> T_amb north of 100'F, it hasn't a hope in hell of preventing the reg
> >> from
> >> going up in smoke.
> >> Apart from advising me to permanantly give up electronics, has anyone
> >> got
> >> any constructive suggestions to make here?
> >> TIA.
> >
> > A series 20Ω 5 watt resistor between the 14.5V and the 5 V regulator
> > would move a lot of that heat.
> >
> > Mikek
> >
> >
> Oh, I see Ricky C beat me to it.

That was almost two years ago!!!

--

Rick C.

+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209

Re: Is 3 Watts really too much to ask?

<sraqqu$qpj$1@dont-email.me>

  copy mid

https://www.novabbs.com/tech/article-flat.php?id=87114&group=sci.electronics.design#87114

  copy link   Newsgroups: sci.electronics.design
Path: i2pn2.org!i2pn.org!aioe.org!eternal-september.org!reader02.eternal-september.org!.POSTED!not-for-mail
From: amd...@knology.net (amdx)
Newsgroups: sci.electronics.design
Subject: Re: Is 3 Watts really too much to ask?
Date: Fri, 7 Jan 2022 19:53:32 -0600
Organization: A noiseless patient Spider
Lines: 42
Message-ID: <sraqqu$qpj$1@dont-email.me>
References: <r7i2gr$al9$5@dont-email.me> <sr4ima$ngi$1@dont-email.me>
<sr4ipi$ngi$2@dont-email.me>
<6cb606ae-ca8d-4554-ab86-42299d1042fbn@googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Injection-Date: Sat, 8 Jan 2022 01:53:35 -0000 (UTC)
Injection-Info: reader02.eternal-september.org; posting-host="282a4f723219af6a540ec9bd4cbc6ef3";
logging-data="27443"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+2566ltufVLajgZwzv7vke"
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
Thunderbird/91.4.1
Cancel-Lock: sha1:G+7Dk28sc+qgVzEHAwGEtyvbizA=
In-Reply-To: <6cb606ae-ca8d-4554-ab86-42299d1042fbn@googlegroups.com>
X-Antivirus-Status: Clean
Content-Language: en-US
X-Antivirus: Avast (VPS 220107-4, 1/7/2022), Outbound message
 by: amdx - Sat, 8 Jan 2022 01:53 UTC

On 1/5/2022 9:43 PM, Rick C wrote:
> On Wednesday, January 5, 2022 at 11:59:36 AM UTC-5, amdx wrote:
>> On 1/5/2022 10:57 AM, amdx wrote:
>>> On 4/19/2020 12:41 PM, Cursitor Doom wrote:
>>>> Gentlemen,
>>>>
>>>> in pursuance of what is turning out to be a jinxed project (installing a
>>>> dashcam) I'm attempting to drop 14.5V (the normal battery voltage whilst
>>>> the engine is running) to 5V for the camera. The camera draws at most
>>>> 300mA so the regulator (an L7805CV) shouldn't find that task too much of
>>>> a struggle, since it only has to disspate just under 3 Watts by my
>>>> reckoning. I'd have thought this reasonably large heatsink (see 20p
>>>> piece
>>>> for scale comparison) would be overkill. Unfortunately it isn't, though.
>>>> Even with a low ambient temp of about 65'F it gets a bit too hot to
>>>> touch
>>>> after a few minutes, so once in the car in a couple of months with a
>>>> T_amb north of 100'F, it hasn't a hope in hell of preventing the reg
>>>> from
>>>> going up in smoke.
>>>> Apart from advising me to permanantly give up electronics, has anyone
>>>> got
>>>> any constructive suggestions to make here?
>>>> TIA.
>>> A series 20Ω 5 watt resistor between the 14.5V and the 5 V regulator
>>> would move a lot of that heat.
>>>
>>> Mikek
>>>
>>>
>> Oh, I see Ricky C beat me to it.
> That was almost two years ago!!!
>
OK, it doesn't count then!

                  Mikek

--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

1
server_pubkey.txt

rocksolid light 0.9.81
clearnet tor