Keep your fingers off my collectors!
 

actually, it's keep MY fingers off the cases of some TO-3 transistors -- I
haven't been able to find the plastic "hats" which go on top of these
transistors to prevent inadvertent contact. I've looked at Digikey, Allied,
Newark and Jameco without success. Anyone point me in the correct
direction?.

John Walton wrote:

actually, it's keep MY fingers off the cases of some TO-3 transistors -- I
haven't been able to find the plastic "hats" which go on top of these
transistors to prevent inadvertent contact. I've looked at Digikey, Allied,
Newark and Jameco without success. Anyone point me in the correct
direction?.

Look at the Keystone 4632 or 4634 http://www.keyelco.com/ page 95,
unless they have updated their on line catalog recently.

--
We now return you to our normally scheduled programming.

Take a look at this little cutie! ;-)
http://home.earthlink.net/~mike.terrell/photos.html

Michael A. Terrell
Central Florida

Looks like Digikey does have them, but you have to order 100!

Jack

"Michael A. Terrell" wrote in message
...
John Walton wrote:

actually, it's keep MY fingers off the cases of some TO-3 transistors --
I
haven't been able to find the plastic "hats" which go on top of these
transistors to prevent inadvertent contact. I've looked at Digikey,
Allied,
Newark and Jameco without success. Anyone point me in the correct
direction?.

Look at the Keystone 4632 or 4634 http://www.keyelco.com/ page 95,
unless they have updated their on line catalog recently.

--
We now return you to our normally scheduled programming.

Take a look at this little cutie! ;-)
http://home.earthlink.net/~mike.terrell/photos.html

Michael A. Terrell
Central Florida

Active Electronics (www.future-active.com) has a good line with some stuff
that Digi-Key doesn't carry. Same goes for Mouser Electronics
(www.mouser.com).

How about whomping up your own, with spacers from the mounting screws going
up to some sort of plastic (1/8" acrylic comes to mind)? This is a
_homebrew_ list, after all.

"Michael A. Terrell" wrote in message
...
John Walton wrote:

actually, it's keep MY fingers off the cases of some TO-3 transistors --
I
haven't been able to find the plastic "hats" which go on top of these
transistors to prevent inadvertent contact. I've looked at Digikey,
Allied,
Newark and Jameco without success. Anyone point me in the correct
direction?.

Look at the Keystone 4632 or 4634 http://www.keyelco.com/ page 95,
unless they have updated their on line catalog recently.

--
We now return you to our normally scheduled programming.

Take a look at this little cutie! ;-)
http://home.earthlink.net/~mike.terrell/photos.html

Michael A. Terrell
Central Florida

Last Christmas my kids gave me a "Grizzly" mini-mill -- you're right, I can
slap something together with acrylic or lexan.
"Tim Wescott" wrote in message
...
Active Electronics (www.future-active.com) has a good line with some stuff
that Digi-Key doesn't carry. Same goes for Mouser Electronics
(www.mouser.com).

How about whomping up your own, with spacers from the mounting screws
going
up to some sort of plastic (1/8" acrylic comes to mind)? This is a
_homebrew_ list, after all.

"Michael A. Terrell" wrote in message
...
John Walton wrote:

actually, it's keep MY fingers off the cases of some TO-3
transistors --
I
haven't been able to find the plastic "hats" which go on top of these
transistors to prevent inadvertent contact. I've looked at Digikey,
Allied,
Newark and Jameco without success. Anyone point me in the correct
direction?.

Look at the Keystone 4632 or 4634 http://www.keyelco.com/ page 95,
unless they have updated their on line catalog recently.

--
We now return you to our normally scheduled programming.

Take a look at this little cutie! ;-)
http://home.earthlink.net/~mike.terrell/photos.html

Michael A. Terrell
Central Florida

In article , "Tim Wescott"
writes:

Active Electronics (www.future-active.com) has a good line with some stuff
that Digi-Key doesn't carry. Same goes for Mouser Electronics
(www.mouser.com).

How about whomping up your own, with spacers from the mounting screws going
up to some sort of plastic (1/8" acrylic comes to mind)? This is a
_homebrew_ list, after all.

I'd suggest using pieces of Vectorboard (composite glass stuff
normally used for prototyping) instead of acrylic on hot power
transistors. Acrylic melting/softening point is rather low.

There was a neat little touch on the Circuit Specialists ready-made
power supplies (I just got a triple unit, excellent buy). There is a
conventional finned heat sink on the back for the power-handling
series regulators. The manufacturer (Chinese) added a simple U-
shape of black anodized aluminum that fits in the "slot" of the
heat sink. That covers the power transistor cases and doesn't
appear to lessen the heat-sinking. Very simple addition to the
standard big extruded aluminum heat sink which has been used
for at least 4 decades. Nothing more than a U structure whose
width is cut to fit the heat sink center area. An aluminum strap
with two little legs at the ends.

Len Anderson
retired (from regular hours) electronic engineer person

Good point -- clear acrylic would look really pretty, until it melted.

If you insulate the transistor with nylon shoulder washers rather than nylon
screws (this is recommended for large temperature excursions, buy the way)
then you could use an aluminum shield, for that matter.

"Avery Fineman" wrote in message
...
In article , "Tim Wescott"
writes:

Active Electronics (www.future-active.com) has a good line with some
stuff
that Digi-Key doesn't carry. Same goes for Mouser Electronics
(www.mouser.com).

How about whomping up your own, with spacers from the mounting screws
going
up to some sort of plastic (1/8" acrylic comes to mind)? This is a
_homebrew_ list, after all.

I'd suggest using pieces of Vectorboard (composite glass stuff
normally used for prototyping) instead of acrylic on hot power
transistors. Acrylic melting/softening point is rather low.

There was a neat little touch on the Circuit Specialists ready-made
power supplies (I just got a triple unit, excellent buy). There is a
conventional finned heat sink on the back for the power-handling
series regulators. The manufacturer (Chinese) added a simple U-
shape of black anodized aluminum that fits in the "slot" of the
heat sink. That covers the power transistor cases and doesn't
appear to lessen the heat-sinking. Very simple addition to the
standard big extruded aluminum heat sink which has been used
for at least 4 decades. Nothing more than a U structure whose
width is cut to fit the heat sink center area. An aluminum strap
with two little legs at the ends.

Len Anderson
retired (from regular hours) electronic engineer person

Well, not all transistors have the collector on the outside case. But if you
contack Caplugs Company, they make plastic caps for just about anything!

John Walton wrote:

Looks like Digikey does have them, but you have to order 100!


I have some used ones from scrapped IBM computer terminals, but they
snap into another set of holes. I may have a couple like Keystone sells,
but I would have to dig for them. How many do you need?

--
We now return you to our normally scheduled programming.

Take a look at this little cutie! ;-)
http://home.earthlink.net/~mike.terrell/photos.html

Michael A. Terrell
Central Florida