The scenario
An audio signal needs to be limited to prevent clipping in subsequent stages. A symmetrical Zener clipper is placed after an input source to cap both positive and negative excursions.
What is in this drawing
Read the decisions behind it.
01
Two back-to-back Zener diodes for symmetrical clipping
02
4.7V Zeners set the clipping threshold (Vz + forward drop)
03
Series resistor limits current during clipping
Use when you need a simple, passive, symmetrical audio level limiter with a sharp clipping threshold and moderate impedance.
More like this