The scenario
Design a relay control board using AT89S52 microcontroller and optotriac drivers to switch AC loads.
What is in this drawing
Read the decisions behind it.
01
Use of solid-state relays (SSR) based on MOC3021 for galvanic isolation
02
Inclusion of crystal oscillator and reset circuit for reliable MCU operation
03
Choice of 220V AC mains and separate DC supply for the microcontroller
When creating an isolated AC load switching circuit controlled by an 8051-family microcontroller.
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