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Surge Capable Chip Resistors

M

Michael A. Terrell

Jan 1, 1970
0
D said:
My projects don't blow up anymore...
I must be doing something wrong :)
That or, I'm getting good at electronics...


Your power supply is under speced. :(


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
M

Michael A. Terrell

Jan 1, 1970
0
John said:
1206's aren't bad. Some of the TO247 mosfets we destructicated made
some serious shrapnel. Some of the "300 watt" parts exploded in 100
milliseconds at 300 watts, bolted to a copper block. We didn't use
them.


That's a wise idea. You have no need to pass out riot gear to the
test techs. ;-)


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
M

MassiveProng

Jan 1, 1970
0
If you have spread solder paste from a stencil, the part will not
roll. It is attached by the surface tension of the flux before
soldering, and is attached by the solder surface tension during
reflow. If your parts are not staying put, then your picker/placer
placement downforce is too high. Or someone didn't program the
component profile height correctly. There is no reason for them to go
anywhere in normal assembly processes.
 
J

John Larkin

Jan 1, 1970
0
If you have spread solder paste from a stencil, the part will not
roll. It is attached by the surface tension of the flux before
soldering, and is attached by the solder surface tension during
reflow. If your parts are not staying put, then your picker/placer
placement downforce is too high. Or someone didn't program the
component profile height correctly. There is no reason for them to go
anywhere in normal assembly processes.

There's no problem with paste. Hand soldering is where the slits help.

John
 
J

joseph2k

Jan 1, 1970
0
D said:
My projects don't blow up anymore...
I must be doing something wrong :)
That or, I'm getting good at electronics...
D from BC

Then you are not properly using the "Amtal rule", test it to destruction,
preferably in several different ways. Then you know just how far you can
afford to respect your warrantee.
 
J

joseph2k

Jan 1, 1970
0
John said:
I've seen TO-3's with holes blown open in the top of the can. Cool.

I wonder what it's like to bring up a megawatt hf transmitter or a big
radar.

John


If megawatt sources were allowed on HF it would be experimental and could be
quite exciting. Bringing up "production" megawatt VHF and UHF transmitters
is usually pretty uneventful, same with megawatt RADAR. Experimental and
pre-production units can be very interesting.
 
M

Michael A. Terrell

Jan 1, 1970
0
joseph2k said:
If megawatt sources were allowed on HF it would be experimental and could be
quite exciting. Bringing up "production" megawatt VHF and UHF transmitters
is usually pretty uneventful, same with megawatt RADAR. Experimental and
pre-production units can be very interesting.


Its also interesting when a high power waveguide switch or circulator
fails. A guy on a tower crew got a nasty burn on his ass when he leaned
against a cracked weld on the waveguide feeding a Ch 55 antenna with 195
KW of UHF RF. There was a VERY slow leak in the dry nitrogen levels in
the waveguide that we couldn't find. He found it the hard way. :(


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
F

Fred Bartoli

Jan 1, 1970
0
Michael A. Terrell a écrit :
Its also interesting when a high power waveguide switch or circulator
fails. A guy on a tower crew got a nasty burn on his ass when he leaned
against a cracked weld on the waveguide feeding a Ch 55 antenna with 195
KW of UHF RF. There was a VERY slow leak in the dry nitrogen levels in
the waveguide that we couldn't find. He found it the hard way. :(

ROTFHAB
 
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