Use resistor instead of regulator?

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John Doe

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Jan 30, 2021, 12:31:47 PMJan 30
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I can put a resistor after a voltage that's too high for the circuit?

Of course the resistor must handle the current.

A decoupling capacitor after the resistor.

Any problems with that?

Thanks.

Jasen Betts

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Jan 30, 2021, 6:00:46 PMJan 30
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If the capacitor is needed there probably are problems.

In the spirit of your question that is all I will say.
--
Jasen.

Rich

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Jan 30, 2021, 6:01:57 PMJan 30
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If your load has a variable current draw, then you will also have a
variable voltage on the load side of the resistor.

John Doe

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Jan 31, 2021, 6:58:35 AMJan 31
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Rich wrote:
If it's a big capacitor, the voltage variation is minimal?

Rich

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Jan 31, 2021, 10:33:20 AMJan 31
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No, the size of the capacitor simply determines the rate at which the
voltage changes. Given a current draw change of sufficient length in
time (length determined by capicator size), the voltage across the
capacitor will settle to that which remains after the new drop across
the resistor.

Wire up a test circuit on a breadboard and measure the changes
yourself.

John Doe

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Feb 1, 2021, 6:26:14 AMFeb 1
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Rich <ri...@example.invalid> wrote:

> John Doe wrote:
>> Rich wrote:
>>> John Doe wrote:
>>
>>>> I can put a resistor after a voltage that's too high for the circuit?
>>>>
>>>> Of course the resistor must handle the current.
>>>>
>>>> A decoupling capacitor after the resistor.
>>>>
>>>> Any problems with that?
>>>
>>> If your load has a variable current draw, then you will also have a
>>> variable voltage on the load side of the resistor.
>>
>> If it's a big capacitor, the voltage variation is minimal?
>
> No, the size of the capacitor simply determines the rate at which the
> voltage changes.

Then your answer should be "Yes", given the same amount of time.

Why are you fighting this?

Do you think it makes you look smart?

Rich

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Feb 1, 2021, 9:59:57 AMFeb 1
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No, the correct answer is "no". The voltage variation can be
substantial. Rate of change is a different measure than voltage
magnitude.

> Why are you fighting this?

Note that I could ask you the same question. My answer is correct,
yours is incorrect.

John Doe

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Feb 1, 2021, 3:11:51 PMFeb 1
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No, thanks anyway...

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Rich <ri...@example.invalid> wrote:

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> Subject: Re: Use resistor instead of regulator?
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RheillyPhoull

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Feb 1, 2021, 8:55:43 PMFeb 1
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On 2/02/2021 4:11 am, John Doe wrote:
> No, thanks anyway...
>
So bugger off and do it know it all.You don't need advice from us humble
mortals !!

John Doe

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Feb 2, 2021, 1:11:52 AMFeb 2
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Lots of reasons for non-answers, crappy answers, and venting. When a group
is dying, for example. Non-answers are entirely understandable and no
problem with me. Normally, people answer questions because they like the
question, and because they want to see their writing on USENET. Then there
are not-quite-grown-ups who love playing with an imaginary kill file
friend (they are not skilled enough to control).

This netcop wannabe troll can go fuck itself...

--
RheillyPhoull <Rhe...@bigslong.com> wrote:

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John Doe

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Feb 2, 2021, 1:13:45 AMFeb 2
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Lots of Australian trolls on USENET recently...

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RheillyPhoull <Rhe...@bigslong.com> wrote:

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RheillyPhoull

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Feb 3, 2021, 7:08:28 PMFeb 3
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On 2/02/2021 2:13 pm, John Doe wrote:
> Lots of Australian trolls on USENET recently...
>
We respond when know it all's ask non detailed questions that require
description of the process involved. Not mentioning the nature of the
load shows how little you understand of the nature of your query.
On the subject of trolls, I see much more of your nick (which I assume
applies to your brain) than mine ??

John Doe

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Feb 4, 2021, 5:27:41 AMFeb 4
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Australia is a small country, but in fact, of the four groups I post to, I
have encountered Australian trolls in three groups recently. There are
several in the electronics design group, the most hyperactive being "Bill
Sloman". The only response to one of my recent posts in the metalworking
group is an Australian troll. And now here. Australia under pressure from
communist China seems to be like Norway before World War II. Will it
continue pleading "neutrality" if communist China invades and rapes it?

--
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RheillyPhoull

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Feb 4, 2021, 6:46:33 PMFeb 4
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On 4/02/2021 6:27 pm, John Doe wrote:
> Australia is a small country, but in fact, of the four groups I post to, I
> have encountered Australian trolls in three groups recently. There are
> several in the electronics design group, the most hyperactive being "Bill
> Sloman". The only response to one of my recent posts in the metalworking
> group is an Australian troll. And now here. Australia under pressure from
> communist China seems to be like Norway before World War II. Will it
> continue pleading "neutrality" if communist China invades and rapes it?
>

WHOOOOSSHH !!

John Doe

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Feb 5, 2021, 5:20:15 AMFeb 5
to
Australia is a small country, but in fact, of the four groups I have
recently posted to, I have encountered Australian trolls in three. There
are several in the electronics design group, the most hyperactive being
"Bill Sloman". The only response to my recent post in the metalworking
group is an Australian troll. And now here. Australia under pressure from
communist China seems to be like Norway before World War II. Will it
continue pleading "neutrality" if communist China invades and rapes it?

A troll who publicly plays with its imaginary kill file friend is almost
always technically incapable of ignoring a thread branch. So they end up
stumbling over all the replies to the person that they allegedly kill
filed.

And they are always incapable of simply pressing the "ignore thread" key
when they see a post by someone they cannot cope with.

Such is the way of this silly troll and its fake kill file...

--
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Glenn Gundlach

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Feb 5, 2021, 2:41:28 PMFeb 5
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Mr. Doe, Rich explained it correctly. You are wrong and he is right. How much Voltage are you trying to get rid of?


John Doe

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Feb 5, 2021, 2:57:42 PMFeb 5
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Bullshit...

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RheillyPhoull

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Feb 5, 2021, 7:26:44 PMFeb 5
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On 6/02/2021 3:57 am, John Doe wrote:
> Bullshit...
>
It displays it's technical prowess again :-) what a joke !!

John Doe

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Feb 5, 2021, 9:47:10 PMFeb 5
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Nothing but a troll...

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RheillyPhoull

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Feb 5, 2021, 11:51:24 PMFeb 5
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On 6/02/2021 10:47 am, John Doe wrote:
> Nothing but a troll...
>
Takes one to recognize one oh brainless one.

Stevo

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Feb 7, 2021, 11:02:31 AMFeb 7
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You people with the off topic messages. What are you, toddlers in nursery school? Please quit ruining the Google group for everyone.

This is not a google group

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Feb 7, 2021, 1:50:23 PMFeb 7
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Stevo <newsolut...@gmail.com> wrote:
> Please quit ruining the Google group for everyone.

This is not a google group.

This is a Usenet news group.

https://en.wikipedia.org/wiki/Usenet

The google groups UI simply provides an interface to the Usenet
newsgroup you are reading.

John Doe

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Feb 7, 2021, 2:15:30 PMFeb 7
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Nym-shifting...

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RheillyPhoull

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Feb 7, 2021, 7:13:03 PMFeb 7
to
Well Neeny Narny Noo google grooper !!

amdx

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Feb 10, 2021, 8:08:54 PMFeb 10
to
 Now you have made yourself look ignorant, which you are, otherwise you
would not have ask the question.

 Say your device needs 9V and you have a 12V source. At some point in
time you measure the current your device draws and it is

20ma, so you decide you need a series 150 ohm resistor.  You have it all
figured out. Then at some point it fails to work.

At some point the motor in this device (the one you didn't explain )
turns on and the voltage drops to 4 volts causing the circuit to fail to
operate.

 Do you want to calculate the capacitance needed to keep you supply
voltage within 5% of your required 9v?

Or do you want to just admit it is a big ass cap and a regulator may be
better.

On the other hand you could give us details of the circuit, so it would
not be a guessing game.

                                                  Mikek





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John Doe

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Feb 10, 2021, 9:43:38 PMFeb 10
to
As discussed in the design group thread, a low dropout regulator looks good.

I'm easy.

--
amdx <am...@knology.net> wrote:

> Path: eternal-september.org!reader02.eternal-september.org!.POSTED!not-for-mail
> From: amdx <am...@knology.net>
> Newsgroups: sci.electronics.basics
> Subject: Re: Use resistor instead of regulator?
> Date: Wed, 10 Feb 2021 19:08:48 -0600
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>
> On 2/1/2021 5:26 AM, John Doe wrote:
>> Rich <ri...@example.invalid> wrote:
>>
>>> John Doe wrote:
>>>> Rich wrote:
>>>>> John Doe wrote:
>>>>>> I can put a resistor after a voltage that's too high for the circuit?
>>>>>>
>>>>>> Of course the resistor must handle the current.
>>>>>>
>>>>>> A decoupling capacitor after the resistor.
>>>>>>
>>>>>> Any problems with that?
>>>>> If your load has a variable current draw, then you will also have a
>>>>> variable voltage on the load side of the resistor.
>>>> If it's a big capacitor, the voltage variation is minimal?
>>> No, the size of the capacitor simply determines the rate at which the
>>> voltage changes.
>> Then your answer should be "Yes", given the same amount of time.
>>
>> Why are you fighting this?
>>
>> Do you think it makes you look smart?
>
> ¶ÿNow you have made yourself look ignorant, which you are, otherwise you
> would not have ask the question.
>
> ¶ÿSay your device needs 9V and you have a 12V source. At some point in
> time you measure the current your device draws and it is
>
> 20ma, so you decide you need a series 150 ohm resistor.¶ÿ You have it all
> figured out. Then at some point it fails to work.
>
> At some point the motor in this device (the one you didn't explain )
> turns on and the voltage drops to 4 volts causing the circuit to fail to
> operate.
>
> ¶ÿDo you want to calculate the capacitance needed to keep you supply
> voltage within 5% of your required 9v?
>
> Or do you want to just admit it is a big ass cap and a regulator may be
> better.
>
> On the other hand you could give us details of the circuit, so it would
> not be a guessing game.
>
> ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ¶ÿ Mikek

amdx

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Feb 11, 2021, 9:14:36 AMFeb 11
to
On 2/10/2021 8:43 PM, John Doe wrote:
> As discussed in the design group thread, a low dropout regulator looks good.
>
> I'm easy.
>
I see you keep posting all the header information, what is the purpose
of that?

I don't know enough about it to glean anything from it, what are you
getting from it?

Bertrand Sindri

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Feb 11, 2021, 10:21:45 AMFeb 11
to
In sci.electronics.basics amdx <am...@knology.net> wrote:
> On 2/10/2021 8:43 PM, John Doe wrote:
>> As discussed in the design group thread, a low dropout regulator
>> looks good.
>>
>> I'm easy.
>>
> I see you keep posting all the header information, what is the
> purpose of that?

That appears to be Mr Doe's signal that he has switched into troll
mode.

If you read through the first few posts in this thread, you'll see that
Mr Doe is indeed quite capable of proper quoting. But once he appears
to get ticked off, he toggles into troll mode and starts quoting
excessive header information (and top posting as well).

He seems to have a very Dr. Jeckyl/Mr. Hyde aspect to his postings.

amdx

unread,
Feb 11, 2021, 11:44:49 AMFeb 11
to
But that takes extra effort on his part, what is his purpose in doing it?

He's trying to accomplish something with the action.

John Doe, what's up?

John Doe

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Feb 11, 2021, 12:44:59 PMFeb 11
to
What part of "I'm easy" don't you understand?

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Bertrand Sindri <bertran...@dont.spam.me@yahoo.com> wrote:

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> From: Bertrand Sindri <bertran...@dont.spam.me@yahoo.com>
> Newsgroups: sci.electronics.basics
> Subject: Re: Use resistor instead of regulator?
> Followup-To: sci.electronics.basics
> Date: Thu, 11 Feb 2021 15:21:38 +0000 (UTC)
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John Doe

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Feb 11, 2021, 12:47:15 PMFeb 11
to
It takes a two syllable voice command... "on top".

Voice-activated scripting is a whole new world for someone who enjoys
systemwide macros in windows.

amdx

unread,
Feb 12, 2021, 8:21:04 AMFeb 12
to
Ok, so you can do it easily, but why do you do it?

What do you think you are doing to the person who's header you put in
the body of the post.

I just want to understand what advantage you get from this act.

Is it something I should start doing when I'm disagree with a poster?

And should I top post when I do it?

Or, am I over thinking this and you can't write a macro to do a proper
post with a quote?

John Doe

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Feb 12, 2021, 9:43:46 AMFeb 12
to
Because.

This group is starving for activity...

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amdx <am...@knology.net> wrote:

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> From: amdx <am...@knology.net>
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> Subject: Re: Use resistor instead of regulator?
> Date: Fri, 12 Feb 2021 07:20:58 -0600
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Bertrand Sindri

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Feb 12, 2021, 10:30:16 AMFeb 12
to
amdx <am...@knology.net> wrote:
> On 2/11/2021 11:47 AM, John Doe wrote:
>> It takes a two syllable voice command... "on top".
>>
>> Voice-activated scripting is a whole new world for someone who
>> enjoys systemwide macros in windows.
>
> Ok, so you can do it easily, but why do you do it?

The appearance on this end of "why" looks to be: "to be irritating".

> What do you think you are doing to the person who's header you put in
> the body of the post.

The appearance given out, when the pattern happens, is that the Mr Hyde
personality half of Mr Doe does it for the purpose of irritation of the
poster to which Mr Doe has chosen to "troll".

> I just want to understand what advantage you get from this act.

There seems to be no advantage. Other than to overtely be irritating.

> Is it something I should start doing when I'm disagree with a poster?
>
> And should I top post when I do it?
>
> Or, am I over thinking this and you can't write a macro to do a
> proper post with a quote?

Except that when Mr Doe is operating from his Dr Jeckyl personality
half, he is quite capable of proper quoting, quote trimming, avoiding
quoting headers, and bottom posting. Implying he can write a macro to
do a proper post.

There are at least two explanations for this:

One - Mr Doe has a proper voice activated macro that can quote properly
and bottom post -- which implies that the header quoting top posting Mr
Hyde personality is a deliberate choice on his part.

Two - Mr Doe only uses his voice activated macro when trolling. Which
is, again, a deliberate choice on his part when the Mr Hyde personality
is activated.

Both boil down to deliberate choices on Mr Doe's part.

So I submit that he deliberatly chooses the top posting, header
quoting, Mr Hyde version to be irritating to the person to which he is
responding.


John Doe

unread,
Feb 12, 2021, 11:06:41 AMFeb 12
to
Nobody forces anybody to read anybody else's posts on USENET. The idea
USENET posts must conform to some standard is nothing but a ridiculous
troll. You can cope with it or you can ignore it.

A netcop wannabe troll starved for attention...

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Bertrand Sindri <bertran...@dont.spam.me@yahoo.com> wrote:

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> From: Bertrand Sindri <bertran...@dont.spam.me@yahoo.com>
> Newsgroups: sci.electronics.basics
> Subject: Re: Use resistor instead of regulator?
> Date: Fri, 12 Feb 2021 15:30:09 +0000 (UTC)
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Jasen Betts

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Feb 12, 2021, 4:02:24 PMFeb 12
to
On 2021-02-12, John Doe <alway...@message.header> wrote:
> Nobody forces anybody to read anybody else's posts on USENET. The idea
> USENET posts must conform to some standard is nothing but a ridiculous
> troll. You can cope with it or you can ignore it.

Generally your mangled posts consist entirely of untruths.
(with the exception of the quoted part), this one seems to have some
truth however.


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Jasen.
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