Here a simple not gate

 

I just have op-amp, cap, resistor, diode, BJT, Mosfet, fuse. Is it possible for building a switch debouncer?

I assume you have a resistor in series with the opto input to limit the current (or you should).
Just add a capacitor from the opto input to ground.
Select the capacitor to form a RC time-constant of about 100ms or more.

 

I know that "By using RC with NOT gate" can make a switch debouncer. (like circuit below)

However, I don't have a NOT gate on hand.

Can anyone suggest an alternative for building a hardware debouncer?

No need answer for:

1. Hardware Debouncing
2. R-C Debouncing
3. Software Debouncing
4. Using Debouncing IC’s

View attachment 105142

What is the meaning of :

Code (Microchip Assembler):

1. 
   
2. DelayCy (10*msecs)

Is it a function provided in Microchip Assembler already? Please explain more.

What is the meaning of :

Code (Microchip Assembler):

1. 
   
2. DelayCy (10*msecs)

Is it a function provided in Microchip Assembler already? Please explain more.

Please....

Dschoonnnn!!!!

 

Tommy Tsang Look at post 21 then think about it a fet or a optocoupler can be used as a not gate easily.
Npn if voltage, If not voltage.
A 2n7000 mosfet if voltage, If not voltage. Or something similar.
Optocoupler If light, If not Light. light is from led inside
All three give a not state.