help me

[losta]

I am a Beginner and I want a simple circle that uses Timer 555 reveal me the vacuum

[kt315]

a game 'what i did bring to you from global net'?

Matchless Metal Locator (Thomas Scarborough, Silicon Chip) - World's simplest (?) IB design

[losta]

Thank you.
I want a circuit to check the vacuum
The picture is an example of a simple circuit that can be built and parts are available
I repeat, I am a beginner
Thank you again

[kt315]

my english is poor... not understood... what you mean 'to check the vacuum'? why you choiced metal detector for the check?

[losta]

I use the translator
There are metal detectors that give a negative signal when there is a vacuum
Use analog indicator with speaker

[Carl-NC]

There are metal detectors that give a negative signal when there is a vacuum

I think you are looking for an underground void. Most metal detectors can do this, some better than others. I would start with a basic TR detector. Not sure of what is available with a 555 timer.