reset circuit design

[canarybird33]

hello
How could I design a reset circuit for below circuit?(both load and MCU must be reset)
I'll appreciate if you get some tutorials about designing reset circuit

 

[Gorgon]

What is defined as 'reset' condition for your circuit?

What is the intention of the 'load' circuit? It looks like a variable heat source (RV2, Q3) with a fixed current.

What is the MCU you are using?

 

[schmitt trigger]

I would use one of the many off the shelf single-IC watchdog and reset devices, available from many semiconductor suppliers, which have plenty of housekeeping features.

For instance: DS1706L

 

[canarybird33]

What is defined as 'reset' condition for your circuit?

What is the intention of the 'load' circuit? It looks like a variable heat source (RV2, Q3) with a fixed current.

What is the MCU you are using?

I want to put a key for circuit to restart the whole circuit(turning off and then on power)
I use AVR(MEGA8)
The LOAD is a Thermistor which is showed as a Potentiometer in picture