[sdiy] touch-sensitive switches - how?

Roman Sowa modular at go2.pl
Wed Apr 28 08:35:13 CEST 2021

There are specialized chips which do only that. I can't recall part 
number, but they are aveilable in 1 and a few output versions up to a 
dozen maybe. I think Microchip makes them among many others.

Some time ago I have bought touch switches using such chip at 
Aliexpress, &0.15 for ready to use touch switch, can be configured as 
toggling or momentary, active high or active low. Works great. Search 
for TTP223.


W dniu 2021-04-27 o 20:50, Neil Harper via Synth-diy pisze:
> how are touch-sensitive switches like the ones on this done?:
> https://www.perfectcircuit.com/random-source-tkb-3-5mm-jacks.html
> being able to do something like this, especially if it's latching  (one
> press on, one press off) would come in very handy. but i've never come
> across it in any diy schematics.
> i see that a few microcontrollers like the teensy have capacitance touch
> pins, but i'm wondering if things like sequencer are done all discrete?
> -- 
> /// Neil Harper
> /// Every Wave is New Until it Breaks
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