Resistor in DC supply line...

On Sunday, August 13, 2023 at 8:26:15 AM UTC-4, Cursitor Doom wrote:
On Sun, 13 Aug 2023 11:54:40 GMT, Jan Panteltje <al...@comet.invalid
wrote:

On a sunny day (Sun, 13 Aug 2023 12:41:10 +0100) it happened Cursitor Doom
c...@notformail.com> wrote in <p7ghdil8l6rhq8qe8...@4ax.com>:

On Sun, 13 Aug 2023 11:33:12 GMT, Jan Panteltje <al...@comet.invalid
wrote:

On a sunny day (Sun, 13 Aug 2023 12:00:35 +0100) it happened Cursitor Doom
c...@notformail.com> wrote in <aqdhdih6bf5r9116f...@4ax.com>:

On Sun, 13 Aug 2023 02:09:23 -0700 (PDT), Ricky
gnuarm.del...@gmail.com> wrote:

On Sunday, August 13, 2023 at 4:52:58?AM UTC-4, Cursitor Doom wrote:
On Sun, 13 Aug 2023 01:43:05 -0700 (PDT), Ricky
gnuarm.del...@gmail.com> wrote:
On Sunday, August 13, 2023 at 4:26:25?AM UTC-4, Cursitor Doom wrote:
Gentlemen,

I refer you to this circuit fragment:

https://disk.yandex.com/i/O-4WvVAgNjmNlg

What\'s R30 supposed to achieve? This is right at the top of the
schematic, btw.

My guess would be to act as the R in a pi filter. Hard to say actually. Or maybe the idea is to provide current limiting
on
application of power. The downstream cap seems to be 2,000 uF which is a whopper. How much current does the output drive?
What
is the output load? The output cap is 1,000 uF.
I couldn\'t come up with anything better than the pi filter possibility
either to be honest, but haven\'t done any calcs to see if that would
make any sense or not. This IC directly drives a 2W 8 ohm speaker.

Have you replaced the resistor yet? I have no idea why it broke, but it\'s not like everything is made perfectly. Have you
tried just reflowing the solder? I\'m assuming it\'s surface mount.

No, it\'s tru hole. Sorry I thought I\'d linked to a picture as well but
it hasn\'t shown up. Let\'s try that again:

https://disk.yandex.com/i/dE9o0lh937qdrg

It\'s the resistor right next to the largest electro.

Do you measure a short across that capacitor?
That UPC2002H is no longer made, could well be the chip.
The filter could work the other way: prevent audio to cause the 13.8V to change



Nope. The caps all test fine for value, ESR and whatnot and there\'s
nothing in that area getting hot either, and that includes the chip.

You did say you did not replace the resistor, so then you have no power to that chip,
Else just use your multimeter on highest current range instead of the 1 Ohm for a second
to see what happens, or even a small lightbulb...
WIthout audio that chip should draw very little current, class B likely.


Jan, I do have some spare 1 ohm resistors in my junk box which I could
use to bridge across! Please credit me with *some* level of
competence! :-D
Click to expand...

What are you trying to do at this point? It seems like you are analyzing it to death.

--

Rick C.

-- Get 1,000 miles of free Supercharging
-- Tesla referral code - https://ts.la/richard11209
 
On a sunny day (Sun, 13 Aug 2023 13:26:08 +0100) it happened Cursitor Doom
<cd@notformail.com> wrote in <ssihdih7q68ak0mreb4qmf44h6squut1ac@4ax.com>:

On Sun, 13 Aug 2023 11:54:40 GMT, Jan Panteltje <alien@comet.invalid
wrote:

On a sunny day (Sun, 13 Aug 2023 12:41:10 +0100) it happened Cursitor Doom
cd@notformail.com> wrote in <p7ghdil8l6rhq8qe8c7vuvir9vvqe58kcr@4ax.com>:

On Sun, 13 Aug 2023 11:33:12 GMT, Jan Panteltje <alien@comet.invalid
wrote:

On a sunny day (Sun, 13 Aug 2023 12:00:35 +0100) it happened Cursitor Doom
cd@notformail.com> wrote in <aqdhdih6bf5r9116ft3ijctfdqguj44qt6@4ax.com>:

On Sun, 13 Aug 2023 02:09:23 -0700 (PDT), Ricky
gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, August 13, 2023 at 4:52:58?AM UTC-4, Cursitor Doom wrote:
On Sun, 13 Aug 2023 01:43:05 -0700 (PDT), Ricky
gnuarm.del...@gmail.com> wrote:
On Sunday, August 13, 2023 at 4:26:25?AM UTC-4, Cursitor Doom wrote:
Gentlemen,

I refer you to this circuit fragment:

https://disk.yandex.com/i/O-4WvVAgNjmNlg

What\'s R30 supposed to achieve? This is right at the top of the
schematic, btw.

My guess would be to act as the R in a pi filter. Hard to say actually. Or maybe the idea is to provide current
limiting
on
application of power. The downstream cap seems to be 2,000 uF which is a whopper. How much current does the output
drive?
What
is the output load? The output cap is 1,000 uF.
I couldn\'t come up with anything better than the pi filter possibility
either to be honest, but haven\'t done any calcs to see if that would
make any sense or not. This IC directly drives a 2W 8 ohm speaker.

Have you replaced the resistor yet? I have no idea why it broke, but it\'s not like everything is made perfectly. Have
you
tried just reflowing the solder? I\'m assuming it\'s surface mount.

No, it\'s tru hole. Sorry I thought I\'d linked to a picture as well but
it hasn\'t shown up. Let\'s try that again:

https://disk.yandex.com/i/dE9o0lh937qdrg

It\'s the resistor right next to the largest electro.

Do you measure a short across that capacitor?
That UPC2002H is no longer made, could well be the chip.
The filter could work the other way: prevent audio to cause the 13.8V to change



Nope. The caps all test fine for value, ESR and whatnot and there\'s
nothing in that area getting hot either, and that includes the chip.

You did say you did not replace the resistor, so then you have no power to that chip,
Else just use your multimeter on highest current range instead of the 1 Ohm for a second
to see what happens, or even a small lightbulb...
WIthout audio that chip should draw very little current, class B likely.



Jan, I do have some spare 1 ohm resistors in my junk box which I could
use to bridge across! Please credit me with *some* level of
competence! :-D
Click to expand...

I dunno, but does it work with a new resistor then?
 
John Larkin <jlarkin@highlandSNIPMEtechnology.com> Wrote in message:r
> On Sun, 13 Aug 2023 09:26:15 +0100, Cursitor Doom <cd@notformail.com>wrote:>Gentlemen,>>I refer you to this circuit fragment:>>https://disk.yandex.com/i/O-4WvVAgNjmNlg>>What\'s R30 supposed to achieve? This is right at the top of the>schematic, btw.It\'s audio. Circuit randomness is high.

Protection mostly. Like you see with the old sg3525.

Cheers
--


----Android NewsGroup Reader----
https://piaohong.s3-us-west-2.amazonaws.com/usenet/index.html
 
On Sunday, August 13, 2023 at 9:01:47 AM UTC-7, Martin Rid wrote:
John Larkin <jla...@highlandSNIPMEtechnology.com> Wrote in message:r
On Sun, 13 Aug 2023 09:26:15 +0100, Cursitor Doom <c...@notformail.com>wrote:>Gentlemen,>>I refer you to this circuit fragment:>>https://disk.yandex.com/i/O-4WvVAgNjmNlg>>What\'s R30 supposed to achieve? This is right at the top of the>schematic, btw.It\'s audio. Circuit randomness is high.

Protection mostly. Like you see with the old sg3525.
Click to expand...

Resistors are cheaper than fuses, I guess.
 
On Sun, 13 Aug 2023 09:08:18 -0700 (PDT), Eddy Lee
<eddy711lee@gmail.com> wrote:

On Sunday, August 13, 2023 at 9:01:47?AM UTC-7, Martin Rid wrote:
John Larkin <jla...@highlandSNIPMEtechnology.com> Wrote in message:r
On Sun, 13 Aug 2023 09:26:15 +0100, Cursitor Doom <c...@notformail.com>wrote:>Gentlemen,>>I refer you to this circuit fragment:>>https://disk.yandex.com/i/O-4WvVAgNjmNlg>>What\'s R30 supposed to achieve? This is right at the top of the>schematic, btw.It\'s audio. Circuit randomness is high.

Protection mostly. Like you see with the old sg3525.

Resistors are cheaper than fuses, I guess.
Click to expand...

I was recently looking into using resistors, low ohms 0805\'s, as fuses
on two D25 connectors, on the theory that I\'d rather fry resistors
than pcb traces. But it looks like we can squeeze in 48 leaded
polyfuses.

We\'ve found surface mount polyfuses to be flakey, and they don\'t save
much PCB area.

The AoE supplement, the X-chapters, has a bunch of experimental data
about exploding resistors. They used my DUT (device under torture)
rig.
 
On Sun, 13 Aug 2023 06:21:19 -0700 (PDT), Fred Bloggs
<bloggs.fredbloggs.fred@gmail.com> wrote:

On Sunday, August 13, 2023 at 4:30:36?AM UTC-4, Cursitor Doom wrote:
The aforementioned resistor failed open-circuit without any external
sign of overheating at all. Bonus points will be awarded for anyone
who can think of a reason why this might have occurred.

I\'ve used metal oxide resistors to shut down a circuit under fault conditions. That technology can be subjected to a couple hundred X it\'s max power rating and open up without a hint of visible damage. Not so with carbon film, that technology swells, smokes, chars and ultimately goes off like a fireworks sparkler.
Click to expand...

Okay, thanks. I know the photo could have been better, but it\'s good
enough for this question: is this a MO resistor or a carbon one? The
radio it comes from is about 35 years old and with my eyesight I
struggle to tell the difference.
 
On Sun, 13 Aug 2023 15:01:09 GMT, Jan Panteltje <alien@comet.invalid>
wrote:

On a sunny day (Sun, 13 Aug 2023 13:26:08 +0100) it happened Cursitor Doom
cd@notformail.com> wrote in <ssihdih7q68ak0mreb4qmf44h6squut1ac@4ax.com>:

On Sun, 13 Aug 2023 11:54:40 GMT, Jan Panteltje <alien@comet.invalid
wrote:

On a sunny day (Sun, 13 Aug 2023 12:41:10 +0100) it happened Cursitor Doom
cd@notformail.com> wrote in <p7ghdil8l6rhq8qe8c7vuvir9vvqe58kcr@4ax.com>:

On Sun, 13 Aug 2023 11:33:12 GMT, Jan Panteltje <alien@comet.invalid
wrote:

On a sunny day (Sun, 13 Aug 2023 12:00:35 +0100) it happened Cursitor Doom
cd@notformail.com> wrote in <aqdhdih6bf5r9116ft3ijctfdqguj44qt6@4ax.com>:

On Sun, 13 Aug 2023 02:09:23 -0700 (PDT), Ricky
gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, August 13, 2023 at 4:52:58?AM UTC-4, Cursitor Doom wrote:
On Sun, 13 Aug 2023 01:43:05 -0700 (PDT), Ricky
gnuarm.del...@gmail.com> wrote:
On Sunday, August 13, 2023 at 4:26:25?AM UTC-4, Cursitor Doom wrote:
Gentlemen,

I refer you to this circuit fragment:

https://disk.yandex.com/i/O-4WvVAgNjmNlg

What\'s R30 supposed to achieve? This is right at the top of the
schematic, btw.

My guess would be to act as the R in a pi filter. Hard to say actually. Or maybe the idea is to provide current
limiting
on
application of power. The downstream cap seems to be 2,000 uF which is a whopper. How much current does the output
drive?
What
is the output load? The output cap is 1,000 uF.
I couldn\'t come up with anything better than the pi filter possibility
either to be honest, but haven\'t done any calcs to see if that would
make any sense or not. This IC directly drives a 2W 8 ohm speaker.

Have you replaced the resistor yet? I have no idea why it broke, but it\'s not like everything is made perfectly. Have
you
tried just reflowing the solder? I\'m assuming it\'s surface mount.

No, it\'s tru hole. Sorry I thought I\'d linked to a picture as well but
it hasn\'t shown up. Let\'s try that again:

https://disk.yandex.com/i/dE9o0lh937qdrg

It\'s the resistor right next to the largest electro.

Do you measure a short across that capacitor?
That UPC2002H is no longer made, could well be the chip.
The filter could work the other way: prevent audio to cause the 13.8V to change



Nope. The caps all test fine for value, ESR and whatnot and there\'s
nothing in that area getting hot either, and that includes the chip.

You did say you did not replace the resistor, so then you have no power to that chip,
Else just use your multimeter on highest current range instead of the 1 Ohm for a second
to see what happens, or even a small lightbulb...
WIthout audio that chip should draw very little current, class B likely.



Jan, I do have some spare 1 ohm resistors in my junk box which I could
use to bridge across! Please credit me with *some* level of
competence! :-D

I dunno, but does it work with a new resistor then?
Click to expand...

Oh, yes. I came alive immediately. Even with the old resistor out of
circuit and with a high power stereoscope, there was not the slightest
sign of any damage to it. I\'m going to fry it with a blow torch later
just to teach it a lesson for being a c*nt to track down.
 
On Sun, 13 Aug 2023 09:32:33 -0700, John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote:

On Sun, 13 Aug 2023 09:08:18 -0700 (PDT), Eddy Lee
eddy711lee@gmail.com> wrote:

On Sunday, August 13, 2023 at 9:01:47?AM UTC-7, Martin Rid wrote:
John Larkin <jla...@highlandSNIPMEtechnology.com> Wrote in message:r
On Sun, 13 Aug 2023 09:26:15 +0100, Cursitor Doom <c...@notformail.com>wrote:>Gentlemen,>>I refer you to this circuit fragment:>>https://disk.yandex.com/i/O-4WvVAgNjmNlg>>What\'s R30 supposed to achieve? This is right at the top of the>schematic, btw.It\'s audio. Circuit randomness is high.

Protection mostly. Like you see with the old sg3525.

Resistors are cheaper than fuses, I guess.

I was recently looking into using resistors, low ohms 0805\'s, as fuses
on two D25 connectors, on the theory that I\'d rather fry resistors
than pcb traces. But it looks like we can squeeze in 48 leaded
polyfuses.

We\'ve found surface mount polyfuses to be flakey, and they don\'t save
much PCB area.

The AoE supplement, the X-chapters, has a bunch of experimental data
about exploding resistors. They used my DUT (device under torture)
rig.
Click to expand...

I just thought - we haven\'t heard a peep out of Win since he invited
corrections to AoE III (or was it II?) Anyway, I hope he\'s okay. We
didn\'t get on politically, but he was a hugely valuable contributor
here.
 
On Sun, 13 Aug 2023 06:56:43 -0700, John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote:

On Sun, 13 Aug 2023 09:26:15 +0100, Cursitor Doom <cd@notformail.com
wrote:

Gentlemen,

I refer you to this circuit fragment:

https://disk.yandex.com/i/O-4WvVAgNjmNlg

What\'s R30 supposed to achieve? This is right at the top of the
schematic, btw.

It\'s audio. Circuit randomness is high.
Click to expand...

But you say essentially the same thing about RF! Am I to assume you\'re
only comfortable answering topics relating to the bit of the spectrum
in between? :-D
 
On Sun, 13 Aug 2023 07:24:21 -0700 (PDT), Ricky
<gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, August 13, 2023 at 8:26:15?AM UTC-4, Cursitor Doom wrote:
On Sun, 13 Aug 2023 11:54:40 GMT, Jan Panteltje <al...@comet.invalid
wrote:

On a sunny day (Sun, 13 Aug 2023 12:41:10 +0100) it happened Cursitor Doom
c...@notformail.com> wrote in <p7ghdil8l6rhq8qe8...@4ax.com>:

On Sun, 13 Aug 2023 11:33:12 GMT, Jan Panteltje <al...@comet.invalid
wrote:

On a sunny day (Sun, 13 Aug 2023 12:00:35 +0100) it happened Cursitor Doom
c...@notformail.com> wrote in <aqdhdih6bf5r9116f...@4ax.com>:

On Sun, 13 Aug 2023 02:09:23 -0700 (PDT), Ricky
gnuarm.del...@gmail.com> wrote:

On Sunday, August 13, 2023 at 4:52:58?AM UTC-4, Cursitor Doom wrote:
On Sun, 13 Aug 2023 01:43:05 -0700 (PDT), Ricky
gnuarm.del...@gmail.com> wrote:
On Sunday, August 13, 2023 at 4:26:25?AM UTC-4, Cursitor Doom wrote:
Gentlemen,

I refer you to this circuit fragment:

https://disk.yandex.com/i/O-4WvVAgNjmNlg

What\'s R30 supposed to achieve? This is right at the top of the
schematic, btw.

My guess would be to act as the R in a pi filter. Hard to say actually. Or maybe the idea is to provide current limiting
on
application of power. The downstream cap seems to be 2,000 uF which is a whopper. How much current does the output drive?
What
is the output load? The output cap is 1,000 uF.
I couldn\'t come up with anything better than the pi filter possibility
either to be honest, but haven\'t done any calcs to see if that would
make any sense or not. This IC directly drives a 2W 8 ohm speaker.

Have you replaced the resistor yet? I have no idea why it broke, but it\'s not like everything is made perfectly. Have you
tried just reflowing the solder? I\'m assuming it\'s surface mount.

No, it\'s tru hole. Sorry I thought I\'d linked to a picture as well but
it hasn\'t shown up. Let\'s try that again:

https://disk.yandex.com/i/dE9o0lh937qdrg

It\'s the resistor right next to the largest electro.

Do you measure a short across that capacitor?
That UPC2002H is no longer made, could well be the chip.
The filter could work the other way: prevent audio to cause the 13.8V to change



Nope. The caps all test fine for value, ESR and whatnot and there\'s
nothing in that area getting hot either, and that includes the chip.

You did say you did not replace the resistor, so then you have no power to that chip,
Else just use your multimeter on highest current range instead of the 1 Ohm for a second
to see what happens, or even a small lightbulb...
WIthout audio that chip should draw very little current, class B likely.


Jan, I do have some spare 1 ohm resistors in my junk box which I could
use to bridge across! Please credit me with *some* level of
competence! :-D

What are you trying to do at this point? It seems like you are analyzing it to death.
Click to expand...

I like to know the ins and outs of this kind of thing to the nth
degree. Phil and Fred have both done a pretty good job of satisfying
this particular craving. Credit\'s due to Jan and others as well.
 
On Sun, 13 Aug 2023 12:51:09 -0400, legg <legg@nospam.magma.ca> wrote:

>Cheaper than a fuse.

Yeah, but ONE OHM? How much current is that going to limit?
 
On 2023-08-13 18:58, Cursitor Doom wrote:
On Sun, 13 Aug 2023 12:51:09 -0400, legg <legg@nospam.magma.ca> wrote:

Cheaper than a fuse.

Yeah, but ONE OHM? How much current is that going to limit?
Click to expand...

It\'s more a matter of how much energy is needed to blow it up.

I used to insert small resistors in the power supply connections
of subcircuits because that makes it easy to measure how much
current goes into each. That\'s a great help in fault finding.

Jeroen Belleman
 
On Sunday, August 13, 2023 at 9:58:43 AM UTC-7, Cursitor Doom wrote:
On Sun, 13 Aug 2023 12:51:09 -0400, legg <le...@nospam.magma.ca> wrote:

Cheaper than a fuse.

Yeah, but ONE OHM? How much current is that going to limit?
Click to expand...

Resistors can sometimes handle 10x rated current or power briefly. It can give out smoke signals and/or change requests (burnt out mark).

I also use halogen/incandescent light bulbs as current meters and fuses.
 
On Sun, 13 Aug 2023 17:47:47 +0100, Cursitor Doom <cd@notformail.com>
wrote:

On Sun, 13 Aug 2023 06:56:43 -0700, John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote:

On Sun, 13 Aug 2023 09:26:15 +0100, Cursitor Doom <cd@notformail.com
wrote:

Gentlemen,

I refer you to this circuit fragment:

https://disk.yandex.com/i/O-4WvVAgNjmNlg

What\'s R30 supposed to achieve? This is right at the top of the
schematic, btw.

It\'s audio. Circuit randomness is high.

But you say essentially the same thing about RF! Am I to assume you\'re
only comfortable answering topics relating to the bit of the spectrum
in between? :-D
Click to expand...

RF generally has measurable things: power, noise figure, impedances.
Audio tends to be more arbitrary, as in \"I like how that sounds.\"

I think sine waves are boring, at both ends of the spectrum.
 
On Sun, 13 Aug 2023 17:58:35 +0100, Cursitor Doom <cd@notformail.com>
wrote:

On Sun, 13 Aug 2023 12:51:09 -0400, legg <legg@nospam.magma.ca> wrote:

Cheaper than a fuse.

Yeah, but ONE OHM? How much current is that going to limit?
Click to expand...

Just about all film resistors 10 ohms and below are nickel film.

These fuse rather predictively to an energy value in excess of
their ratings. Like fuses, they can provide protection from
single-fault abnormals, reducing ancilliary component and trace
damage. There need be no dynamic rupturing, as in other film types,
but in some cases (eg HV fet gate drive) unavoidable.

Combined with low voltage, low power zeners, reliable surge
protection can also be developed.

It would have served better use in the line to the regulator and
off-board contacts, in your schematic, but that\'s designer/bean
counter prerogative.

RL
 
On Sun, 13 Aug 2023 10:14:04 -0700 (PDT), Eddy Lee
<eddy711lee@gmail.com> wrote:

On Sunday, August 13, 2023 at 9:58:43?AM UTC-7, Cursitor Doom wrote:
On Sun, 13 Aug 2023 12:51:09 -0400, legg <le...@nospam.magma.ca> wrote:

Cheaper than a fuse.

Yeah, but ONE OHM? How much current is that going to limit?

Resistors can sometimes handle 10x rated current or power briefly. It can give out smoke signals and/or change requests (burnt out mark).

I also use halogen/incandescent light bulbs as current meters and fuses.
Click to expand...

Check out Diodes\' AP22652 current limiter chip. Very slick.

We tried a TI E-fuse thing and it worked like a real fuse, just once,
except that it failed shorted.

A wire bond might be a good fuse. Imagine an IC that had a couple of
input pins and a bunch of outputs and just wire bonds inside.
 
On Sunday, August 13, 2023 at 12:54:54 PM UTC-7, John Larkin wrote:
On Sun, 13 Aug 2023 10:14:04 -0700 (PDT), Eddy Lee
eddy7...@gmail.com> wrote:
On Sunday, August 13, 2023 at 9:58:43?AM UTC-7, Cursitor Doom wrote:
On Sun, 13 Aug 2023 12:51:09 -0400, legg <le...@nospam.magma.ca> wrote:

Cheaper than a fuse.

Yeah, but ONE OHM? How much current is that going to limit?

Resistors can sometimes handle 10x rated current or power briefly. It can give out smoke signals and/or change requests (burnt out mark).

I also use halogen/incandescent light bulbs as current meters and fuses.
Check out Diodes\' AP22652 current limiter chip. Very slick.

We tried a TI E-fuse thing and it worked like a real fuse, just once,
except that it failed shorted.
Click to expand...

Then it\'s not a fuse.

A wire bond might be a good fuse. Imagine an IC that had a couple of
input pins and a bunch of outputs and just wire bonds inside.
Click to expand...

Sometimes i use very thin wire as fuse.
 
On Sunday, August 13, 2023 at 4:51:43 PM UTC-4, Eddy Lee wrote:
On Sunday, August 13, 2023 at 12:54:54 PM UTC-7, John Larkin wrote:
On Sun, 13 Aug 2023 10:14:04 -0700 (PDT), Eddy Lee
eddy7...@gmail.com> wrote:
On Sunday, August 13, 2023 at 9:58:43?AM UTC-7, Cursitor Doom wrote:
On Sun, 13 Aug 2023 12:51:09 -0400, legg <le...@nospam.magma.ca> wrote:

Cheaper than a fuse.

Yeah, but ONE OHM? How much current is that going to limit?

Resistors can sometimes handle 10x rated current or power briefly. It can give out smoke signals and/or change requests (burnt out mark).

I also use halogen/incandescent light bulbs as current meters and fuses.
Check out Diodes\' AP22652 current limiter chip. Very slick.

We tried a TI E-fuse thing and it worked like a real fuse, just once,
except that it failed shorted.
Then it\'s not a fuse.
A wire bond might be a good fuse. Imagine an IC that had a couple of
input pins and a bunch of outputs and just wire bonds inside.
Sometimes i use very thin wire as fuse.
Click to expand...

Why does that not surprise me at all?

--

Rick C.

-+ Get 1,000 miles of free Supercharging
-+ Tesla referral code - https://ts.la/richard11209
 
On Sunday, August 13, 2023 at 2:16:12 PM UTC-7, Ricky wrote:
On Sunday, August 13, 2023 at 4:51:43 PM UTC-4, Eddy Lee wrote:
On Sunday, August 13, 2023 at 12:54:54 PM UTC-7, John Larkin wrote:
On Sun, 13 Aug 2023 10:14:04 -0700 (PDT), Eddy Lee
eddy7...@gmail.com> wrote:
On Sunday, August 13, 2023 at 9:58:43?AM UTC-7, Cursitor Doom wrote:
On Sun, 13 Aug 2023 12:51:09 -0400, legg <le...@nospam.magma.ca> wrote:

Cheaper than a fuse.

Yeah, but ONE OHM? How much current is that going to limit?

Resistors can sometimes handle 10x rated current or power briefly. It can give out smoke signals and/or change requests (burnt out mark).

I also use halogen/incandescent light bulbs as current meters and fuses.
Check out Diodes\' AP22652 current limiter chip. Very slick.

We tried a TI E-fuse thing and it worked like a real fuse, just once,
except that it failed shorted.
Then it\'s not a fuse.
A wire bond might be a good fuse. Imagine an IC that had a couple of
input pins and a bunch of outputs and just wire bonds inside.
Sometimes i use very thin wire as fuse.
Why does that not surprise me at all?
Click to expand...

A fuse is just a thin wire in a safe place. As long as I know the wire is safe from burning other thing, it\'s as good as a fuse.
 
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