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Using hot glue around supplied mic - good idea, stupid idea?

 

I installed the mic and impulse switch in a plastic top and wonder about the wisdom of squiring some hot glue on the inside of the top to secure the mic and especially the PTT button.

Just not sure how an elecret mic will fair after being "heated" up.

Any thoughts?

Paul
Thomas Noel
 

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Paul,

You could “Pot” the components in epoxy, so long as the switch is sealed against liquid entry. All the bits are cheap enough to make the try low cost if it fails.

As to hot melt glue, there are some that are lower temperature melting point than others. If you want to try, heat a teaspoon of glue to runny and pour on just a bit to coat everything with a thin quick-cooling layer. Let that cool and then fill the cap. The first layer will protect the components from the later pour.

Thomas W Noel
KF7RSF

On Apr 24, 2017, at 3:35 PM, w6png via Groups.Io <w6png@...> wrote:

I installed the mic and impulse switch in a plastic top and wonder about the wisdom of squiring some hot glue on the inside of the top to secure the mic and especially the PTT button.

Just not sure how an elecret mic will fair after being "heated" up.

Any thoughts?

Paul

<IMG_7003.jpg><IMG_7002.jpg>
 

I hot glued mine and cit seems to work well.
 

I liked that Mosley receiver in the first picture!!!

73's
Fernando - PY2FZU

On Mon, 24 Apr 2017 16:40:15 -0700
"KD8CGH" <rkayakr@...> wrote:

I hot glued mine and cit seems to work well.

--
Fernando Krouwel <flky661@...>
Simon Thompson
 

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Awesome rig. But is your PA transistor connected to the metal box, or is there an insulator there?

On Apr 24, 2017, at 4:40 PM, KD8CGH <rkayakr@...> wrote:

I hot glued mine and cit seems to work well.

<IMG_2048s.jpg><IMG_2047s.jpg>
 

Instead of HOT glue , 2 component Epoxy might be a safer option.

Frank,?? GM0CSZ / KN6WH?????? in IO87AT


On Mon, Apr 24, 2017 at 11:35 PM, w6png via Groups.Io <w6png@...> wrote:

I installed the mic and impulse switch in a plastic top and wonder about the wisdom of squiring some hot glue on the inside of the top to secure the mic and especially the PTT button.

Just not sure how an elecret mic will fair after being "heated" up.

Any thoughts?

Paul
 

Fernando - Nice that you recognized the Mosley. They are pretty rare. I was lucky enough to have one like that in the mid 60s as my first real ham receiver.

Simon - There is a standard mica insulator between the PA and the heat sink. If you ground the PA tab you immediately let the smoke out somewhere on the board.

Frank - Epoxy is forever. It makes rearranging difficult. The hot melt you can peel off. That said, some cable strain relief is useful. I used shrink wrap to protect the mic cable and a zip tie as strain relief.
 

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Or silicone caulking.

Mike

K5ESS

?

From: [email protected] [mailto:[email protected]] On Behalf Of Frank Dinger ,GM0CSZ
Sent: Tuesday, April 25, 2017 5:54 AM
To: [email protected]
Subject: Re: [BITX20] Using hot glue around supplied mic - good idea, stupid idea?

?

Instead of HOT glue , 2 component Epoxy might be a safer option.


Frank,?? GM0CSZ / KN6WH?????? in IO87AT

?

?

On Mon, Apr 24, 2017 at 11:35 PM, w6png via Groups.Io <w6png@...> wrote:

I installed the mic and impulse switch in a plastic top and wonder about the wisdom of squiring some hot glue on the inside of the top to secure the mic and especially the PTT button.

Just not sure how an elecret mic will fair after being "heated" up.

Any thoughts?

Paul

?
 

I used hot glue around mine, it's not an issue at all. And mine is HOT hot glue, not the cooler kid stuff.?


--?

Ryan Flowers W7RLF?
 

stupid idea!
body heat can distroy gain of ECM, might melt ultra thin polymer diaphragm
sometimes...
here distroyed thousand :)

On 25/04/2017, w6png via Groups.Io <w6png@...> wrote:
I installed the mic and impulse switch in a plastic top and wonder about the
wisdom of squiring some hot glue on the inside of the top to secure the mic
and especially the PTT button.

Just not sure how an elecret mic will fair after being "heated" up.

Any thoughts?

Paul
--
Please encourage recycling, reuse or repairing of E-waste.
?7?3? ?d?e? ?V?U?3?S?X?T?
Jack Purdum
 

I used a hot glue gun on mine and it worked fine.

Jack, W8TEE


From: Sandeep Lohia <sandeeplohia12@...>
To: [email protected]
Sent: Tuesday, April 25, 2017 9:15 PM
Subject: Re: [BITX20] Using hot glue around supplied mic - good idea, stupid idea?

stupid idea!
body heat can distroy gain of ECM, might melt ultra thin polymer diaphragm
sometimes...
here distroyed thousand :)

On 25/04/2017, w6png via Groups.Io <w6png=[email protected]> wrote:
> I installed the mic and impulse switch in a plastic top and wonder about the
> wisdom of squiring some hot glue on the inside of the top to secure the mic
> and especially the PTT button.
>
> Just not sure how an elecret mic will fair after being "heated" up.
>
> Any thoughts?
>
> Paul
>


--
Please encourage recycling, reuse or repairing of E-waste.
?7?3? ?d?e? ?V?U?3?S?X?T?
 

I think I must have the "kids" hot glue system as it delivered "not too hot" glue which was encouraging until I realized the viscosity was very low. As a consequence have glue within the cap but not quite where I wanted it!

However, I did apply a little super glue around the mic and switch to set them into the opening before applying the hot glue. With the strain relief it all seems good enough for the time being.

As I want to take the Bitx40 and mic out on a SOTA activation (www.w6png.wordpress.com) what I ended up with seems fine.

Thanks for all the comments, guidance and suggestions.

Paul?

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