modified 9 years ago

Analog line protection

00:39:57

If you need to acquire a signal into a I/O board which exceeds its voltage range (10V in this example), a resistive voltage divisor is required and then a 10V bidirectioanl transil before the board analog input. When voltage is more than 10V the two zener diodes start to conduct discharging current to ground. 
In the second version I put a buffer made with an OpAmp configured as voltage follower to prevent any possible leakage current into the transil which can turn it on accidentally.

published 9 years ago

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.