For driving a visual display why does it matter?

Because I prefer the 40106 for the touch sensor

 

Because I prefer the 40106 for the touch sensor

Breadboard tested the curcuit successfully, but the touch is too sensitive or something, if you connect a wire or the frame to R1 the red LED sometimes turns on forever. Please advice ? Or do I have to use a small push button after all with a switch debounce curcuit ?

 

Not surprised. The frame is too much metal for the touch plate.
Try increasing the value of R1, start with 1meg
Ideally the touch plate should only be about 1 square inch.
I'll check to see if I can reduce the sensitivity also.

 

Or do I have to use a small push button after all with a switch debounce curcuit

That would work too. No need for the debounce circuit with the 40106.
Add switch, change R2 to 1M and remove C1.

 

Thanks. I think I got a CD4017AE. What is the difference between CD4017AE and CD4017BE ?

 

Thanks. I think I got a CD4017AE. What is the difference between CD4017AE and CD4017BE ?

The AE chip draws slightly more current in standby but not enough to make any difference.

 

Ok. Maybe that is related to my next question. Why does a simple RC switch debounce curcuit not work with this setup ?

 

Ok. Maybe that is related to my next question. Why does a simple RC switch debounce curcuit not work with this setup ?

In this circuit the output is delayed 1 second so no need to debounce the switch.

 

In this circuit the output is delayed 1 second so no need to debounce the switch.

True, but why can I not simply replace the CD40106 curcuit with a simple RC curcuit (is it because of the low current) ?

 

True, but why can I not simply replace the CD40106 curcuit with a simple RC curcuit (is it because of the low current) ?

You can if you want. My design was based on a touch switch with delays.

 

You can if you want. My design was based on a touch switch with delays.

But it does not work. Is it because the CD4017AE don't have an clock gate, but the CD4017BE does ?

 

Nothing to do with the type of 4017. Remove R6 the 10K resistor from pin 14.

 

What is the coolest flat metal push button I could mount on the 32 mm. aluminium frame ?

 

That's rather subjective. Just Google push button switches.

 

I like this 10 mm push button with blue light power symbol, embedded in a 10.5 mm hole in the aluminium frame.

 

I like this 10 mm push button with blue light power symbol,

Is that a momentary switch?

 

Yes

 

Is there a way to make a 3 x 21700 battery pack (external BMS), 12V 4.4A, using spacers, but without soldering or spot welding on the batteries ? What about cold, chemical soldering ?

 

Breadboard tested the curcuit successfully, but the touch is too sensitive or something, if you connect a wire or the frame to R1 the red LED sometimes turns on forever. Please advice ? Or do I have to use a small push button after all with a switch debounce curcuit ?View attachment 286645

You can make this touch-sensor idea work:

1) Make sure your metal frame is completely insulated from all the electronics, just one connection - the touch point.

2) Add a large metal plate to the REAR of the frame, it must be INSULATED from the frame- connect this to the GROUND of your electronics.
Now your touch circuit has capacitive coupling to the world (GND) and a nice big separate touch plate at the front.

3) adjust the sensitivity of the circuit to obtain the desired results.

I has little chance of ever working without the large reference electrode at the back.

 

You can make this touch-sensor idea work:

1) Make sure your metal frame is completely insulated from all the electronics, just one connection - the touch point.

2) Add a large metal plate to the REAR of the frame, it must be INSULATED from the frame- connect this to the GROUND of your electronics.
Now your touch circuit has capacitive coupling to the world (GND) and a nice big separate touch plate at the front.

3) adjust the sensitivity of the circuit to obtain the desired results.

I has little chance of ever working without the large reference electrode at the back.

Thanks. Worth a try. The aluminium frame is already isolated from anything else, only mounted around the MDF cabinet using strong doublesided adhesive tape. How big shoul the plate be ? Could you make a drawing sketch ?