Hi, i am using TRIAC(Bt138-800) as 220AC switch. To arduino board are connected shift registers(74HC595), and and they are sending signals to turn on switch. Using moc3061. R5 is 1W 39R resiztor, instead of R7 would be capacitor 0.01uF 630W ( coulnd find needed size capacitor on proteus to make pcb, so putted resistor, cos they are the same size). R6 and R8 are 1W 330R resisotors. Scheme works fine.
My questions are:
- Resistors R6 and R8, their value, what that value gives, can i put lover or higher R resistors, and would be a problem if i put one resistor 1W second 2W?
- there would be about 10 switches, current would be from 0.5A and on some swithces might be about 2A. They would be turned up to 12 hours. Do i need some radiators for TRIAC, or they would be fine?
AC switch.BMP (489 KB)