And can trigger a CD4070BM96 count (clock to high).

 

OK, triggering thru aluminum. What would you be using to trigger it??? A magnet can work, Or an electromagnet could do it.
BUT from what distance and how frequently, and what are the additional details that we have not been told about yet. Also, what limitations are we going to be told about after the first 15 posts??? How far away will the trigger be?? AND, what supply voltage will the CD4070 be using. Because the supply voltage also affects the trigger voltage.
An electromagnetic trigger will be easy and sort of simple, except for winding 500 turns of #32 wire, or maybe #38 wire, on a one inch diameter flat coil form.

 

Any Magnetically sensitive Switch will act exactly like the Aluminum is not there at all.

But You specified "Inductive-Switch",
which could easily mean over ~100 different things that are not specifically "Magnetic".

Possibly You are not aware of the differences ?

Please clearly state, with every detail possible,
exactly what it is that You want to accomplish,
and WHY You want to do it that way.

Must your project be completely "non-contact" with the Aluminum ?,
and if so, what is the desired distance that the Switch must become activated ?

Must the Switch only be activated by Push-Button ?, such as an Automotive style "Key-Fob" ?,
or must the Switch be activated only by proximity to the "Target-Area" ?
.
.
.

 

My scuba flashlights have those magnetic reed switches. But never seen them for sale as a single unit. Always have to be designed/built into the plastic or metal.

Widely used in two parts to sense doors opening for alarms :

 

Sorry, meant touch switch, not inductive. 5v

 

Hi osl,
Do you mean a capacitive touch switch?
If Yes, the answer to your query is No.
E

 

Hi osl,
Do you mean a capacitive touch switch?
If Yes, the answer to your query is No.
E

Yes, capacitive touch switch.

 

Hi,
So the answer is No, to your question.
E

 

Can you then perhaps turn an aluminum surface into a capacitive touch surface ?

 

hi osl.
Look through this video link, it may give you some ideas.
E
https://www.youtube.com/results?search_query=DIY+capacitive+touch+switch

 

It will help understand the application much better if we know more about it. The fact is that touch switches depend on a change in capacitance either altering the ambient field, or coupling energy either out or in to the capacitive sensing surface. So if the aluminum piece was a touch plate on a wall, then certainly it could be done. But if it is the surface of a car, then probably not. But if it is a gas tank on a motorcycle, there is a possibility, if it can be isolated from the frame. I did once build a "touch sensor" device that would switch on the light when one sat in the easy-chair that had the wire sensor beneath the cushion. That was always a laugh at parties, as the chair was in a darker corner.

 

You could make the entire aluminum piece a touch switch, but not just a part of it. Because aluminum is a goid conductor, a touch anywhere on it will have the same effect. If the box is grounded, I don’t think there is any way (within your reach or mine) to make it work. If you have a ground (earth) available but not connected to the aluminum, that makes it easier.

 

Of course, since we have no details, these suggestions are all wild guesses..

 

Aluminium frame 24x24x1.25x0.3"
The rest is black MDF
Would like to use the frame as touch on/off button.

 

What I think I see is an aluminum speaker enclosure. Also some mechanical details that look to be related to it. BUT I still fail to see the relationship to the discussion. THAT is probably due to my lack of mind-reading ability. A severe handicap indeed.

 

I don't get it,
Speakers generally don't need to be turned On and Off.
.
.
.

 

Certainly LQC is correct, but the system feeding the speaker will need some sort of control.

So what is needed now is an additional explanation of what the goal is for the system that would be controlled thru the aluminum plate.

 

24v bluetooth

 

Please,
the objective is not to see how short your answer can be,
but to provide us with the most information practical,
so that we can provide You with the most valuable and pertinent answers possible.

We are still totally in the dark on your project.

Why must something be switched ?

On another related subject ..........
The design of your Speaker-Cabinet is very problematic.
It is way too thin,
it will buzz and rattle all over the place and have peaks and dips galore in Output Response.
A Speaker-Cabinet must be extremely rigid and well damped.