C
Commander Kinsey
Guest
On Tue, 15 Feb 2022 20:19:47 -0000, Rick C <gnuarm.deletethisbit@gmail.com> wrote:
I prefer cheap to safe.
I prefer cheap to safe.
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C
Commander Kinsey
Guest
On Sun, 13 Feb 2022 20:55:51 -0000, Rick C <gnuarm.deletethisbit@gmail.com> wrote:
I\'ve learned from someone on Quora that it\'s actually a PTC Fuse - a resettable semiconductor fuse.
The second image in the link shows a brown disk, which I thought was a ceramic capacitor. Looks like it\'s to stop a busted battery from being overcharged when a cell has died.
On Sunday, February 13, 2022 at 3:33:49 PM UTC-5, Commander Kinsey wrote:
https://imgur.com/a/b8l5qKQ
Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge?
Maybe it\'s an AC battery? They are very useful for grid storage applications as long as you can control the phase.
What makes you think that component is a capacitor? I\'m assuming you drew the schematic.
I\'ve learned from someone on Quora that it\'s actually a PTC Fuse - a resettable semiconductor fuse.
The second image in the link shows a brown disk, which I thought was a ceramic capacitor. Looks like it\'s to stop a busted battery from being overcharged when a cell has died.
C
Commander Kinsey
Guest
On Sun, 13 Feb 2022 21:56:55 -0000, jkn <jkn_gg@nicorp.f9.co.uk> wrote:
I didn\'t expect two completely different devices to look identical. So how the fuck am I supposed to tell which one is?
On Sunday, February 13, 2022 at 9:16:58 PM UTC, Custos Custodum wrote:
On Sun, 13 Feb 2022 12:52:31 -0800 (PST), jkn <jkn...@nicorp.f9.co.uk
wrote:
On Sunday, February 13, 2022 at 8:33:42 PM UTC, Commander Kinsey wrote:
https://imgur.com/a/b8l5qKQ
Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge?
What else might that yellow thing be, other than a capacitor?
A thermistor or a VDR, to provide current limiting.
Regarding operation, power diodes tend to have a higher Vf than small
signal diodes or transistor junctions, so once the diode goes into
conduction it produces a large enough voltage to turn on the
transistor and the red LED, indicating that charging is taking place.
The green LED merely indicates that power is applied to the circuit.
My (probably futile) hope was that he might answer it himself,
or at least try to...
I didn\'t expect two completely different devices to look identical. So how the fuck am I supposed to tell which one is?
P
Phil Allison
Guest
Commander Kinsey wrote:
=====================
Goes high resistance when hot and drops backs when cool.
> The second image in the link shows a brown disk, which I thought was a ceramic capacitor.
** Shame about the odd markings.
> Looks like it\'s to stop a busted battery from being overcharged when a cell has died.
** Nope.
Would only act on a short or reverse connected battery.
...... Phil
=====================
What makes you think that component is a capacitor? I\'m assuming you drew the schematic.
I\'ve learned from someone on Quora that it\'s actually a PTC Fuse - a resettable semiconductor fuse.
** It\'s \"self resetting\".
Goes high resistance when hot and drops backs when cool.
> The second image in the link shows a brown disk, which I thought was a ceramic capacitor.
** Shame about the odd markings.
> Looks like it\'s to stop a busted battery from being overcharged when a cell has died.
** Nope.
Would only act on a short or reverse connected battery.
...... Phil
R
Rex Jones
Guest
On Mon, 14 Feb 2022 09:47:41 +1100, Commander Kinsey <CK1@nospam.com>
wrote:
The text on it, fuckwit.
wrote:
On Sun, 13 Feb 2022 21:56:55 -0000, jkn <jkn_gg@nicorp.f9.co.uk> wrote:
On Sunday, February 13, 2022 at 9:16:58 PM UTC, Custos Custodum wrote:
On Sun, 13 Feb 2022 12:52:31 -0800 (PST), jkn <jkn...@nicorp.f9.co.uk
wrote:
On Sunday, February 13, 2022 at 8:33:42 PM UTC, Commander Kinsey
wrote:
https://imgur.com/a/b8l5qKQ
Look at the circuit diagram. The positive of the battery is only
connected through a capacitor. How can a capacitor possibly pass DC
current to allow the battery to charge?
What else might that yellow thing be, other than a capacitor?
A thermistor or a VDR, to provide current limiting.
Regarding operation, power diodes tend to have a higher Vf than small
signal diodes or transistor junctions, so once the diode goes into
conduction it produces a large enough voltage to turn on the
transistor and the red LED, indicating that charging is taking place.
The green LED merely indicates that power is applied to the circuit.
My (probably futile) hope was that he might answer it himself,
or at least try to...
I didn\'t expect two completely different devices to look identical. So
how the fuck am I supposed to tell which one is?
The text on it, fuckwit.
C
Commander Kinsey
Guest
On Sun, 13 Feb 2022 22:54:07 -0000, Phil Allison <pallison49@gmail.com> wrote:
Those aren\'t shown in the pictures.
One cell shorted, much higher current flows, duh. Now fuck off Rod.
Commander Kinsey wrote:
=====================
What makes you think that component is a capacitor? I\'m assuming you drew the schematic.
I\'ve learned from someone on Quora that it\'s actually a PTC Fuse - a resettable semiconductor fuse.
** It\'s \"self resetting\".
Goes high resistance when hot and drops backs when cool.
The second image in the link shows a brown disk, which I thought was a ceramic capacitor.
** Shame about the odd markings.
Those aren\'t shown in the pictures.
Looks like it\'s to stop a busted battery from being overcharged when a cell has died.
** Nope.
Would only act on a short or reverse connected battery.
One cell shorted, much higher current flows, duh. Now fuck off Rod.
R
Rick C
Guest
On Sunday, February 13, 2022 at 5:34:04 PM UTC-5, Commander Kinsey wrote:
It won\'t do that. It is simply a fuse that prevents too high a current from flowing, such as if you connected the battery backwards.
I\'m not sure what this circuit is supposed to do. It doesn\'t look right to me.
--
Rick C.
+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209
On Sun, 13 Feb 2022 20:55:51 -0000, Rick C <gnuarm.del...@gmail.com> wrote:
On Sunday, February 13, 2022 at 3:33:49 PM UTC-5, Commander Kinsey wrote:
https://imgur.com/a/b8l5qKQ
Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge?
Maybe it\'s an AC battery? They are very useful for grid storage applications as long as you can control the phase.
What makes you think that component is a capacitor? I\'m assuming you drew the schematic.
I\'ve learned from someone on Quora that it\'s actually a PTC Fuse - a resettable semiconductor fuse.
The second image in the link shows a brown disk, which I thought was a ceramic capacitor. Looks like it\'s to stop a busted battery from being overcharged when a cell has died.
It won\'t do that. It is simply a fuse that prevents too high a current from flowing, such as if you connected the battery backwards.
I\'m not sure what this circuit is supposed to do. It doesn\'t look right to me.
--
Rick C.
+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209
P
Phil Allison
Guest
Commander Kinsey wrote:
=====================
** Not YOUR charger ??
How deceitful.
** Is a short.
Fuck off you bullshitting, charlatan IDIOT.
...... Phil
=====================
The second image in the link shows a brown disk, which I thought was a ceramic capacitor.
** Shame about the odd markings.
Those aren\'t shown in the pictures.
** Not YOUR charger ??
How deceitful.
Looks like it\'s to stop a busted battery from being overcharged when a cell has died.
** Nope.
Would only act on a short or reverse connected battery.
One cell shorted,
** Is a short.
Fuck off you bullshitting, charlatan IDIOT.
...... Phil
C
Commander Kinsey
Guest
On Sun, 13 Feb 2022 23:02:03 -0000, Rick C <gnuarm.deletethisbit@gmail.com> wrote:
Surely a higher current would flow if the battery became 9 cells instead of 10 because one failed and became zero volts? Ever tried charging a car battery with 14V when it only contains 5 working cells? The others boil.
> I\'m not sure what this circuit is supposed to do. It doesn\'t look right to me.
It\'s the (5 hour) charger for a very cheap cordless drill. The input is a 14.4V wall wart. The output is to a pack of NiCad cells. It\'s worked fine for years, until I can no longer find replacement NiCad cells, so I\'m converting the battery packs to LiIon.
On Sunday, February 13, 2022 at 5:34:04 PM UTC-5, Commander Kinsey wrote:
On Sun, 13 Feb 2022 20:55:51 -0000, Rick C <gnuarm.del...@gmail.com> wrote:
On Sunday, February 13, 2022 at 3:33:49 PM UTC-5, Commander Kinsey wrote:
https://imgur.com/a/b8l5qKQ
Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge?
Maybe it\'s an AC battery? They are very useful for grid storage applications as long as you can control the phase.
What makes you think that component is a capacitor? I\'m assuming you drew the schematic.
I\'ve learned from someone on Quora that it\'s actually a PTC Fuse - a resettable semiconductor fuse.
The second image in the link shows a brown disk, which I thought was a ceramic capacitor. Looks like it\'s to stop a busted battery from being overcharged when a cell has died.
It won\'t do that. It is simply a fuse that prevents too high a current from flowing, such as if you connected the battery backwards.
Surely a higher current would flow if the battery became 9 cells instead of 10 because one failed and became zero volts? Ever tried charging a car battery with 14V when it only contains 5 working cells? The others boil.
> I\'m not sure what this circuit is supposed to do. It doesn\'t look right to me.
It\'s the (5 hour) charger for a very cheap cordless drill. The input is a 14.4V wall wart. The output is to a pack of NiCad cells. It\'s worked fine for years, until I can no longer find replacement NiCad cells, so I\'m converting the battery packs to LiIon.
P
Peeler
Guest
On Mon, 14 Feb 2022 09:54:27 +1100, Rex Jones, better known as cantankerous
trolling senile geezer Rodent Speed, wrote:
<FLUSH the two subnormal sociopathic cretins\' endless absolutely idiotic
blather>
--
Another typical retarded \"conversation\" between the two resident idiots:
Birdbrain: \"But imagine how cool it was to own slaves.\"
Senile Rodent: \"Yeah, right. Feed them, clothe them, and fix them when
they\'re broken.
After all, you paid good money for them. Then you\'ve got to keep an eye
on them all the time.\"
Birdbrain: \"Better than having to give them wages on top of that.\"
Senile Rodent: \"Specially when they make more slaves for you
and produce their own food and clothes.\"
MID: <fvlcdcFq2icU1@mid.individual.net>
trolling senile geezer Rodent Speed, wrote:
<FLUSH the two subnormal sociopathic cretins\' endless absolutely idiotic
blather>
--
Another typical retarded \"conversation\" between the two resident idiots:
Birdbrain: \"But imagine how cool it was to own slaves.\"
Senile Rodent: \"Yeah, right. Feed them, clothe them, and fix them when
they\'re broken.
After all, you paid good money for them. Then you\'ve got to keep an eye
on them all the time.\"
Birdbrain: \"Better than having to give them wages on top of that.\"
Senile Rodent: \"Specially when they make more slaves for you
and produce their own food and clothes.\"
MID: <fvlcdcFq2icU1@mid.individual.net>
S
server
Guest
On Sun, 13 Feb 2022 20:33:34 -0000, \"Commander Kinsey\"
<CK1@nospam.com> wrote:
It can\'t. Maybe that yellow disk is not a capacitor.
--
I yam what I yam - Popeye
<CK1@nospam.com> wrote:
https://imgur.com/a/b8l5qKQ
Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge?
It can\'t. Maybe that yellow disk is not a capacitor.
--
I yam what I yam - Popeye
S
server
Guest
On Sun, 13 Feb 2022 22:47:41 -0000, \"Commander Kinsey\"
<CK1@nospam.com> wrote:
Try an ohmmeter.
--
I yam what I yam - Popeye
<CK1@nospam.com> wrote:
On Sun, 13 Feb 2022 21:56:55 -0000, jkn <jkn_gg@nicorp.f9.co.uk> wrote:
On Sunday, February 13, 2022 at 9:16:58 PM UTC, Custos Custodum wrote:
On Sun, 13 Feb 2022 12:52:31 -0800 (PST), jkn <jkn...@nicorp.f9.co.uk
wrote:
On Sunday, February 13, 2022 at 8:33:42 PM UTC, Commander Kinsey wrote:
https://imgur.com/a/b8l5qKQ
Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge?
What else might that yellow thing be, other than a capacitor?
A thermistor or a VDR, to provide current limiting.
Regarding operation, power diodes tend to have a higher Vf than small
signal diodes or transistor junctions, so once the diode goes into
conduction it produces a large enough voltage to turn on the
transistor and the red LED, indicating that charging is taking place.
The green LED merely indicates that power is applied to the circuit.
My (probably futile) hope was that he might answer it himself,
or at least try to...
I didn\'t expect two completely different devices to look identical. So how the fuck am I supposed to tell which one is?
Try an ohmmeter.
--
I yam what I yam - Popeye
R
Rick C
Guest
On Sunday, February 13, 2022 at 6:08:03 PM UTC-5, Commander Kinsey wrote:
My point is this circuit isn\'t setting the voltage or limiting current other than through the fuse. It appears to be a couple of LEDs that indicate the battery is charging and/or has power. The diode will prevent the transistor from ever turning on more than a tiny amount, but with the gain of the transistor the red LED is turned on with a small current in the transistor BE path. It could be more clear if you redraw it with the base on the right, the resistor to the right of that and the diode across the two. The two resistors and the green LED probably should be on the left, where power comes in. That\'s all they do is indicate the presence of power.
In any event, it is the wall wart that would seem to be doing all the work of charging the battery, setting the max current and the max voltage just by having a significant series resistance most likely. That\'s why the fuse is not needed for a shorted cell. Being at 11V instead of 14V isn\'t enough to make the current jump so much. A short or reversed battery is a different matter.
--
Rick C.
-- Get 1,000 miles of free Supercharging
-- Tesla referral code - https://ts.la/richard11209
On Sun, 13 Feb 2022 23:02:03 -0000, Rick C <gnuarm.del...@gmail.com> wrote:
On Sunday, February 13, 2022 at 5:34:04 PM UTC-5, Commander Kinsey wrote:
On Sun, 13 Feb 2022 20:55:51 -0000, Rick C <gnuarm.del...@gmail.com> wrote:
On Sunday, February 13, 2022 at 3:33:49 PM UTC-5, Commander Kinsey wrote:
https://imgur.com/a/b8l5qKQ
Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge?
Maybe it\'s an AC battery? They are very useful for grid storage applications as long as you can control the phase.
What makes you think that component is a capacitor? I\'m assuming you drew the schematic.
I\'ve learned from someone on Quora that it\'s actually a PTC Fuse - a resettable semiconductor fuse.
The second image in the link shows a brown disk, which I thought was a ceramic capacitor. Looks like it\'s to stop a busted battery from being overcharged when a cell has died.
It won\'t do that. It is simply a fuse that prevents too high a current from flowing, such as if you connected the battery backwards.
Surely a higher current would flow if the battery became 9 cells instead of 10 because one failed and became zero volts? Ever tried charging a car battery with 14V when it only contains 5 working cells? The others boil.
I\'m not sure what this circuit is supposed to do. It doesn\'t look right to me.
It\'s the (5 hour) charger for a very cheap cordless drill. The input is a 14.4V wall wart. The output is to a pack of NiCad cells. It\'s worked fine for years, until I can no longer find replacement NiCad cells, so I\'m converting the battery packs to LiIon.
My point is this circuit isn\'t setting the voltage or limiting current other than through the fuse. It appears to be a couple of LEDs that indicate the battery is charging and/or has power. The diode will prevent the transistor from ever turning on more than a tiny amount, but with the gain of the transistor the red LED is turned on with a small current in the transistor BE path. It could be more clear if you redraw it with the base on the right, the resistor to the right of that and the diode across the two. The two resistors and the green LED probably should be on the left, where power comes in. That\'s all they do is indicate the presence of power.
In any event, it is the wall wart that would seem to be doing all the work of charging the battery, setting the max current and the max voltage just by having a significant series resistance most likely. That\'s why the fuse is not needed for a shorted cell. Being at 11V instead of 14V isn\'t enough to make the current jump so much. A short or reversed battery is a different matter.
--
Rick C.
-- Get 1,000 miles of free Supercharging
-- Tesla referral code - https://ts.la/richard11209
P
Phil Allison
Guest
jla...@highlandsniptechnology.com wrote:
=========================================
** That requires an IQ.
=========================================
I didn\'t expect two completely different devices to look identical.
So how the fuck am I supposed to tell which one is?
Try an ohmmeter.
** That requires an IQ.
P
Phil Allison
Guest
gnuarm.del...@gmail.com wrote:
===========================
** Red LED comes on when charging due to forward drop across the 1A diode.
Green LED comes on when charging complete due to voltage rise on pack.
The pak charges via the 1A diode ONLY.
Same diode protects cct from reverse pak connection.
..... Phil
===========================
I\'m not sure what this circuit is supposed to do. It doesn\'t look right to me.
** Red LED comes on when charging due to forward drop across the 1A diode.
Green LED comes on when charging complete due to voltage rise on pack.
The pak charges via the 1A diode ONLY.
Same diode protects cct from reverse pak connection.
..... Phil
C
Commander Kinsey
Guest
On Sun, 13 Feb 2022 23:59:33 -0000, <jlarkin@highlandsniptechnology.com> wrote:
Not so easy when in the middle of a big circuit.
On Sun, 13 Feb 2022 22:47:41 -0000, \"Commander Kinsey\"
CK1@nospam.com> wrote:
On Sun, 13 Feb 2022 21:56:55 -0000, jkn <jkn_gg@nicorp.f9.co.uk> wrote:
On Sunday, February 13, 2022 at 9:16:58 PM UTC, Custos Custodum wrote:
On Sun, 13 Feb 2022 12:52:31 -0800 (PST), jkn <jkn...@nicorp.f9.co.uk
wrote:
On Sunday, February 13, 2022 at 8:33:42 PM UTC, Commander Kinsey wrote:
https://imgur.com/a/b8l5qKQ
Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge?
What else might that yellow thing be, other than a capacitor?
A thermistor or a VDR, to provide current limiting.
Regarding operation, power diodes tend to have a higher Vf than small
signal diodes or transistor junctions, so once the diode goes into
conduction it produces a large enough voltage to turn on the
transistor and the red LED, indicating that charging is taking place.
The green LED merely indicates that power is applied to the circuit.
My (probably futile) hope was that he might answer it himself,
or at least try to...
I didn\'t expect two completely different devices to look identical. So how the fuck am I supposed to tell which one is?
Try an ohmmeter.
Not so easy when in the middle of a big circuit.
R
Rick C
Guest
On Sunday, February 13, 2022 at 7:39:08 PM UTC-5, Commander Kinsey wrote:
One end of it is connected only to the battery which I believe you can remove.
--
Rick C.
-+ Get 1,000 miles of free Supercharging
-+ Tesla referral code - https://ts.la/richard11209
On Sun, 13 Feb 2022 23:59:33 -0000, <jla...@highlandsniptechnology.com> wrote:
On Sun, 13 Feb 2022 22:47:41 -0000, \"Commander Kinsey\"
C...@nospam.com> wrote:
On Sun, 13 Feb 2022 21:56:55 -0000, jkn <jkn...@nicorp.f9.co.uk> wrote:
On Sunday, February 13, 2022 at 9:16:58 PM UTC, Custos Custodum wrote:
On Sun, 13 Feb 2022 12:52:31 -0800 (PST), jkn <jkn...@nicorp.f9.co.uk
wrote:
On Sunday, February 13, 2022 at 8:33:42 PM UTC, Commander Kinsey wrote:
https://imgur.com/a/b8l5qKQ
Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge?
What else might that yellow thing be, other than a capacitor?
A thermistor or a VDR, to provide current limiting.
Regarding operation, power diodes tend to have a higher Vf than small
signal diodes or transistor junctions, so once the diode goes into
conduction it produces a large enough voltage to turn on the
transistor and the red LED, indicating that charging is taking place.
The green LED merely indicates that power is applied to the circuit.
My (probably futile) hope was that he might answer it himself,
or at least try to...
I didn\'t expect two completely different devices to look identical. So how the fuck am I supposed to tell which one is?
Try an ohmmeter.
Not so easy when in the middle of a big circuit.
One end of it is connected only to the battery which I believe you can remove.
--
Rick C.
-+ Get 1,000 miles of free Supercharging
-+ Tesla referral code - https://ts.la/richard11209
C
Commander Kinsey
Guest
On Mon, 14 Feb 2022 00:10:47 -0000, Rick C <gnuarm.deletethisbit@gmail.com> wrote:
It will be limited by the wall wart, which is a basic transformer and diodes. Since it\'s a 5 hour charge, it won\'t harm the battery to just keep going.
> It appears to be a couple of LEDs that indicate the battery is charging and/or has power.
Yes, the battery is basically just charged through the diode and fuse.
> The diode will prevent the transistor from ever turning on more than a tiny amount, but with the gain of the transistor the red LED is turned on with a small current in the transistor BE path. It could be more clear if you redraw it with the base on the right, the resistor to the right of that and the diode across the two. The two resistors and the green LED probably should be on the left, where power comes in. That\'s all they do is indicate the presence of power.
Yeah it was just a quick sketch to try to understand it.
> In any event, it is the wall wart that would seem to be doing all the work of charging the battery, setting the max current and the max voltage just by having a significant series resistance most likely.
Ah, you beat me to it.
> That\'s why the fuse is not needed for a shorted cell. Being at 11V instead of 14V isn\'t enough to make the current jump so much. A short or reversed battery is a different matter.
Unless NiCads are vastly different to car batteries, one shorted cell makes a hell of a lot more current flow.
On Sunday, February 13, 2022 at 6:08:03 PM UTC-5, Commander Kinsey wrote:
On Sun, 13 Feb 2022 23:02:03 -0000, Rick C <gnuarm.del...@gmail.com> wrote:
On Sunday, February 13, 2022 at 5:34:04 PM UTC-5, Commander Kinsey wrote:
On Sun, 13 Feb 2022 20:55:51 -0000, Rick C <gnuarm.del...@gmail.com> wrote:
On Sunday, February 13, 2022 at 3:33:49 PM UTC-5, Commander Kinsey wrote:
https://imgur.com/a/b8l5qKQ
Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge?
Maybe it\'s an AC battery? They are very useful for grid storage applications as long as you can control the phase.
What makes you think that component is a capacitor? I\'m assuming you drew the schematic.
I\'ve learned from someone on Quora that it\'s actually a PTC Fuse - a resettable semiconductor fuse.
The second image in the link shows a brown disk, which I thought was a ceramic capacitor. Looks like it\'s to stop a busted battery from being overcharged when a cell has died.
It won\'t do that. It is simply a fuse that prevents too high a current from flowing, such as if you connected the battery backwards.
Surely a higher current would flow if the battery became 9 cells instead of 10 because one failed and became zero volts? Ever tried charging a car battery with 14V when it only contains 5 working cells? The others boil.
I\'m not sure what this circuit is supposed to do. It doesn\'t look right to me.
It\'s the (5 hour) charger for a very cheap cordless drill. The input is a 14.4V wall wart. The output is to a pack of NiCad cells. It\'s worked fine for years, until I can no longer find replacement NiCad cells, so I\'m converting the battery packs to LiIon.
My point is this circuit isn\'t setting the voltage or limiting current other than through the fuse.
It will be limited by the wall wart, which is a basic transformer and diodes. Since it\'s a 5 hour charge, it won\'t harm the battery to just keep going.
> It appears to be a couple of LEDs that indicate the battery is charging and/or has power.
Yes, the battery is basically just charged through the diode and fuse.
> The diode will prevent the transistor from ever turning on more than a tiny amount, but with the gain of the transistor the red LED is turned on with a small current in the transistor BE path. It could be more clear if you redraw it with the base on the right, the resistor to the right of that and the diode across the two. The two resistors and the green LED probably should be on the left, where power comes in. That\'s all they do is indicate the presence of power.
Yeah it was just a quick sketch to try to understand it.
> In any event, it is the wall wart that would seem to be doing all the work of charging the battery, setting the max current and the max voltage just by having a significant series resistance most likely.
Ah, you beat me to it.
> That\'s why the fuse is not needed for a shorted cell. Being at 11V instead of 14V isn\'t enough to make the current jump so much. A short or reversed battery is a different matter.
Unless NiCads are vastly different to car batteries, one shorted cell makes a hell of a lot more current flow.
W
williamwright
Guest
On 14/02/2022 00:47, Commander Kinsey wrote:
They are vastly different.
Bill
Unless NiCads are vastly different to car batteries, one shorted cell
makes a hell of a lot more current flow.
They are vastly different.
Bill
P
Phil Allison
Guest
Commander Kinsey wrote:
=======================
** Well, that is because they ARE !!
NiCd charging is always constant current with voltage increase or temp sensing.
Lead acid charging is constant voltage with a current limit.
When a NiCd cell approaches full charge, the voltage rises above 1.25V to about 1.45V then DROPS again as it heats severely.
OTOH, as a nominal 2.2V lead acid cell approaches full charge current flow drops suddenly and voltage peaks out at 2.7V
It then out gasses.
...... Phil
=======================
Unless NiCads are vastly different to car batteries, one shorted cell makes a hell of a lot more current flow.
** Well, that is because they ARE !!
NiCd charging is always constant current with voltage increase or temp sensing.
Lead acid charging is constant voltage with a current limit.
When a NiCd cell approaches full charge, the voltage rises above 1.25V to about 1.45V then DROPS again as it heats severely.
OTOH, as a nominal 2.2V lead acid cell approaches full charge current flow drops suddenly and voltage peaks out at 2.7V
It then out gasses.
...... Phil