Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
L5, L6 : for EMC suppression issue. Avoid unwant signal radiates through telephone line.
VAR1 : varistor, for protection against high voltage
Z1, Z2 : standard zener diode
PC1 : bidirection photocoupler. You can use PC817 or equivalent if kine reversal detection is not required.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.