What is Trap



Band Eliminate Filter (B. E. F.) which blocks or attenuates particular frequency is called trap.



Contrariwise, ceramic filter passes only particular frequency. Sound trap for TV set is one of the

famous example of B. E. F.of the FM-IF circuit.



In TV set, video signal is used in picture amplitude circuit after video signal detection block,

ceramic resonator is insert here and trap circuit is formed in order to eliminate sound signal

involved in video signal.

Type of Ceramic Trap

Token’s Ceramic trap is divided into 2 types:

1. Two-Terminal Ceramic Trap:

Two-terminal ceramic Trap is used in Black and White TV sets since the number of peripheral

components can be reduced, though its attenuation isn’t so much.

2. Three-Terminal Ceramic Trap:

Three-terminal ceramic trap has a monolith structure formed from 2 ceramic resonators. The

characteristic of a three-terminal ceramic trap equals two two-terminal ceramic trap. The

three-terminal ceramic trap needs additional coil, it is used in Color TV set and VCR because to

its high attenuation.

Design Notes of Ceramic Trap

Design Notes

Ceramic Trap

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Version 2010

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