Illustrating what I am asking about, over there...

Dave

Dave wrote:
Illustrating what I am asking about, over there...

Looks like some sort of thermal overload breaker to me.

--
Regards,

John Popelish

Hmmm. On my server the post with the jpeg was deleted almost immediately.
Because of it's size, maybe?

Anyway, there is one of those, but it is on the other side. There are two
of these, presumably for the different settings on the charger? Wondering
why it would measure as a diode...

Thanks John. We'll see...

Dave

"John Popelish" wrote in message
. ..
Dave wrote:
Illustrating what I am asking about, over there...

Looks like some sort of thermal overload breaker to me.

--
Regards,

John Popelish

Dave wrote:
Hmmm. On my server the post with the jpeg was deleted almost immediately.
Because of it's size, maybe?

Anyway, there is one of those, but it is on the other side. There are two
of these, presumably for the different settings on the charger? Wondering
why it would measure as a diode...

If it measures as a diode, then it is a diode. Are there
two of them connected to a center tapped secondary?

Are there other diodes, as well?

--
Regards,

John Popelish

"John Popelish" wrote in message
. ..
Dave wrote:
Hmmm. On my server the post with the jpeg was deleted almost
immediately. Because of it's size, maybe?

Anyway, there is one of those, but it is on the other side. There are
two of these, presumably for the different settings on the charger?
Wondering why it would measure as a diode...

If it measures as a diode, then it is a diode. Are there two of them
connected to a center tapped secondary?

Are there other diodes, as well?

--
Regards,

John Popelish

Yes, John, that is what they are connected to. And no other diodes, of any
kind. But the SCR bolts to the same heatsink, with the anode otherwise
unconnected. What have I got here?

Thanks,

Dave

Dave wrote:
"John Popelish" wrote in message
. ..
Dave wrote:
Hmmm. On my server the post with the jpeg was deleted almost
immediately. Because of it's size, maybe?

Anyway, there is one of those, but it is on the other side. There are
two of these, presumably for the different settings on the charger?
Wondering why it would measure as a diode...
If it measures as a diode, then it is a diode. Are there two of them
connected to a center tapped secondary?

Are there other diodes, as well?

--
Regards,

John Popelish

Yes, John, that is what they are connected to. And no other diodes, of any
kind. But the SCR bolts to the same heatsink, with the anode otherwise
unconnected. What have I got here?

Is it possible that they are dual diodes and the heat sink
rivet is the common cathode connection? I hate rivets as
electrical connections, but I have seen it done in low cost
consumer equipment. Common cathode pairs connected to the
phase control SCR (and over charge cut-off) this way would
make a working charger concept.


--
Regards,

John Popelish

"John Popelish" wrote in message
. ..
Dave wrote:
"John Popelish" wrote in message
. ..
Dave wrote:
Hmmm. On my server the post with the jpeg was deleted almost
immediately. Because of it's size, maybe?

Anyway, there is one of those, but it is on the other side. There are
two of these, presumably for the different settings on the charger?
Wondering why it would measure as a diode...
If it measures as a diode, then it is a diode. Are there two of them
connected to a center tapped secondary?

Are there other diodes, as well?

--
Regards,

John Popelish

Yes, John, that is what they are connected to. And no other diodes, of
any kind. But the SCR bolts to the same heatsink, with the anode
otherwise unconnected. What have I got here?

Is it possible that they are dual diodes and the heat sink rivet is the
common cathode connection? I hate rivets as electrical connections, but I
have seen it done in low cost consumer equipment. Common cathode pairs
connected to the phase control SCR (and over charge cut-off) this way
would make a working charger concept.


--
Regards,

John Popelish

Hmmm. There doesn't appear to be any electrical connection to the rivet
(now a screw). Are these not some type of diode using the electrical
characteristics of oxide as a factor?

Thanks,

Dave

"Meat Plow" wrote in message
...
On Fri, 20 Jun 2008 12:39:53 -0500, Dave wrote:

Hmmm. On my server the post with the jpeg was deleted almost
immediately.
Because of it's size, maybe?

Anyway, there is one of those, but it is on the other side. There are
two
of these, presumably for the different settings on the charger?
Wondering
why it would measure as a diode...

Thanks John. We'll see...

Where do the blue wires go to?



The blue wires go to the device in question, in the jpeg of the whole
charger (top removed).

"Meat Plow" wrote in message
...
On Fri, 20 Jun 2008 12:39:53 -0500, Dave wrote:

Hmmm. On my server the post with the jpeg was deleted almost
immediately.
Because of it's size, maybe?

Anyway, there is one of those, but it is on the other side. There are
two
of these, presumably for the different settings on the charger?
Wondering
why it would measure as a diode...

Thanks John. We'll see...

Where do the blue wires go to?




Just realized, you may be asking where else the blue wires go. The go
between the secondary of the transformer, and the device in question.
Sorry.

Just realized, you may be asking where else the blue wires go. The go
between the secondary of the transformer, and the device in question.
Sorry.

No problem. If they are attached to the secondary then the device is a
dual diode with a common cathode. Here is a simple circuit.

http://www.electronic-circuits-diagr...psimages/7.gif




Okay, so I could probably replace them with two stud-mount (is that right?)
diodes, with the cathodes bolted to the heat-sink? Does that sound right?

Dave

"Meat Plow" wrote in message
...
On Fri, 20 Jun 2008 21:35:37 -0500, Dave wrote:





Just realized, you may be asking where else the blue wires go. The go
between the secondary of the transformer, and the device in question.
Sorry.

No problem. If they are attached to the secondary then the device is a
dual diode with a common cathode. Here is a simple circuit.

http://www.electronic-circuits-diagr...psimages/7.gif




Okay, so I could probably replace them with two stud-mount (is that
right?) diodes, with the cathodes bolted to the heat-sink? Does that
sound right?


From what limited info I've got from you and if that simple circuit
resembles what you have, yes. You might want to find a couple cheap
2 amp axial lead diodes and rig them just to test this before you spend
money and time mounting the stud mount diodes.



I have several 5A axial lead diodes in my junk box. May hook them up
tomorrow. Will have to think about that some, just to make sure I get it
right. And yes, your simple circuit schematic does resemble what I appear
to have. Think I am headed to bed right now though. Thanks for the
feedback, and thought-provoking ideas.

Take it easy...

Dave

Dave wrote:

Okay, so I could probably replace them with two stud-mount (is that right?)
diodes, with the cathodes bolted to the heat-sink? Does that sound right?

That would be my guess, if the central rivet clamps some
rear contact to the aluminum. If there is no electrical
contact (including a normal silicon or Schottky diode drop)
between the stab-ons and the panel, then I am stuck.

Why are you so intent on replacing them?

--
Regards,

John Popelish

"John Popelish" wrote in message
. ..
Dave wrote:

Okay, so I could probably replace them with two stud-mount (is that
right?) diodes, with the cathodes bolted to the heat-sink? Does that
sound right?

That would be my guess, if the central rivet clamps some rear contact to
the aluminum. If there is no electrical contact (including a normal
silicon or Schottky diode drop) between the stab-ons and the panel, then I
am stuck.

Why are you so intent on replacing them?


Wanting to replace them because the output of the charger is only 10.5
volts, not 13.6 or anything near that. It only charges a battery halfway,
and doesn't start a car easily. Trying to fix that.

Dave

"Dave" wrote in message
ca...

"John Popelish" wrote in message
. ..
Dave wrote:

Okay, so I could probably replace them with two stud-mount (is that
right?) diodes, with the cathodes bolted to the heat-sink? Does that
sound right?

That would be my guess, if the central rivet clamps some rear contact to
the aluminum. If there is no electrical contact (including a normal
silicon or Schottky diode drop) between the stab-ons and the panel, then
I am stuck.

Why are you so intent on replacing them?


Wanting to replace them because the output of the charger is only 10.5
volts, not 13.6 or anything near that. It only charges a battery halfway,
and doesn't start a car easily. Trying to fix that.

Dave



10.7V, actually. And I just thought of something I want to check again...

D

"Dave" wrote in message
netamerica...

"Dave" wrote in message
ca...

"John Popelish" wrote in message
. ..
Dave wrote:

Okay, so I could probably replace them with two stud-mount (is that
right?) diodes, with the cathodes bolted to the heat-sink? Does that
sound right?

That would be my guess, if the central rivet clamps some rear contact to
the aluminum. If there is no electrical contact (including a normal
silicon or Schottky diode drop) between the stab-ons and the panel, then
I am stuck.

Why are you so intent on replacing them?


Wanting to replace them because the output of the charger is only 10.5
volts, not 13.6 or anything near that. It only charges a battery
halfway, and doesn't start a car easily. Trying to fix that.

Dave



10.7V, actually. And I just thought of something I want to check again...

D



Never mind about checking anything right now. We are headed out in a few
minutes, and I forgot I left it disassembled... Later.

D

Dave,

According to the EXIF information stored in your photo, you have the focus
set to "Distant"!

MJM

On Sat, 21 Jun 2008 11:00:39 -0500, "Dave" wrote:


"Dave" wrote in message
ca...

"John Popelish" wrote in message
. ..
Dave wrote:

Okay, so I could probably replace them with two stud-mount (is that
right?) diodes, with the cathodes bolted to the heat-sink? Does that
sound right?

That would be my guess, if the central rivet clamps some rear contact to
the aluminum. If there is no electrical contact (including a normal
silicon or Schottky diode drop) between the stab-ons and the panel, then
I am stuck.

Why are you so intent on replacing them?


Wanting to replace them because the output of the charger is only 10.5
volts, not 13.6 or anything near that. It only charges a battery halfway,
and doesn't start a car easily. Trying to fix that.

Dave



10.7V, actually. And I just thought of something I want to check again...

D

I have one of those chargers. It will turn off in the boost mode if it
stays on too long.I assume it is getting hot. So couldn't you just
temporarily jump this thing and check the output voltage at the clips?
If the thing is bad would it not read 13.x volts at the clips jumped?
I used to have a nearly new transformer for those also.

On Sat, 21 Jun 2008 08:15:14 -0500, "Dave" wrote:


"John Popelish" wrote in message
...
Dave wrote:

Okay, so I could probably replace them with two stud-mount (is that
right?) diodes, with the cathodes bolted to the heat-sink? Does that
sound right?

That would be my guess, if the central rivet clamps some rear contact to
the aluminum. If there is no electrical contact (including a normal
silicon or Schottky diode drop) between the stab-ons and the panel, then I
am stuck.

Why are you so intent on replacing them?


Wanting to replace them because the output of the charger is only 10.5
volts, not 13.6 or anything near that. It only charges a battery halfway,
and doesn't start a car easily. Trying to fix that.

Dave


If you measured the output voltage with the charger _not_ connected to
the battery, 10.5 volts may be quite reasonable. Simple chargers
rarely have filter capacitors, so, without a battery connected, you'll
be measuring pulsating DC - your meter will read some sort of
"average" voltage of that waveform.


--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca

"Phat Bytestard" wrote in message
...
On Fri, 20 Jun 2008 22:29:17 -0400, Meat Plow
wrote:

On Fri, 20 Jun 2008 21:13:40 -0500, Dave wrote:


"Meat Plow" wrote in message
...
On Fri, 20 Jun 2008 12:39:53 -0500, Dave wrote:

Hmmm. On my server the post with the jpeg was deleted almost
immediately.
Because of it's size, maybe?

Anyway, there is one of those, but it is on the other side. There are
two
of these, presumably for the different settings on the charger?
Wondering
why it would measure as a diode...

Thanks John. We'll see...

Where do the blue wires go to?




Just realized, you may be asking where else the blue wires go. The go
between the secondary of the transformer, and the device in question.
Sorry.

No problem. If they are attached to the secondary then the device is a
dual diode with a common cathode. Here is a simple circuit.


Nice assumption, chump. It could (and very likely is) an inline thermal
switch.

I'd be willing to bet that the other end is connected directly to the
output lead.

And you would be wrong. I am not the idiot you assume.

Really?! Will have to check that out. Suspected I was screwing it up
somehow, just didn't know what it was I was doing wrong. Thank you. There
may be hope...


"MJM" wrote in message
...
Dave,

According to the EXIF information stored in your photo, you have the focus
set to "Distant"!

MJM

"Meat Plow" wrote in message
...
On Sat, 21 Jun 2008 19:45:34 -0500, Dave wrote:


"Phat Bytestard" wrote in message
...
On Fri, 20 Jun 2008 22:29:17 -0400, Meat Plow
wrote:

On Fri, 20 Jun 2008 21:13:40 -0500, Dave wrote:


"Meat Plow" wrote in message
...
On Fri, 20 Jun 2008 12:39:53 -0500, Dave wrote:

Hmmm. On my server the post with the jpeg was deleted almost
immediately.
Because of it's size, maybe?

Anyway, there is one of those, but it is on the other side. There
are two
of these, presumably for the different settings on the charger?
Wondering
why it would measure as a diode...

Thanks John. We'll see...

Where do the blue wires go to?




Just realized, you may be asking where else the blue wires go. The go
between the secondary of the transformer, and the device in question.
Sorry.

No problem. If they are attached to the secondary then the device is a
dual diode with a common cathode. Here is a simple circuit.


Nice assumption, chump. It could (and very likely is) an inline thermal
switch.

I'd be willing to bet that the other end is connected directly to the
output lead.

And you would be wrong. I am not the idiot you assume.

Pay no attention to Phat. He's taken such a beating on Usenet he
can't post anything but mindless drivel as to seek any attention good or
bad. He changes posting names to avoid kill filters since nobody will have
anything to do with his idiotic spew.



Not a problem. I ignore people all the time. That was my only exception to
this one.

Take it easy...

D

According to the EXIF information stored in your photo, you have the
focus set to "Distant"!

So what, did you ever hear of "close up adapters"?
--
Joe