# Electronics - Basic Op-Amp Circuits - Discussion

### Discussion :: Basic Op-Amp Circuits - General Questions (Q.No.3)

3.

A zero-level detector is a

 [A]. comparator with a sine-wave output [B]. comparator with a trip point referenced to zero [C]. peak detector [D]. limiter

Explanation:

No answer description available for this question.

 Chinmay said: (Jul 17, 2012) A zero crossing detector is a comparator with the reference level set at zero. It is used for detecting the zero crossings of AC signals. It can be made from an operational amplifier with an input voltage at its positive input.

 Rohit said: (Oct 20, 2014) What is zero crossing, can you explain it?

 Prachi said: (Jan 1, 2015) What is trip point?

 Seema Bharti Kumawat said: (Mar 3, 2016) What is trip point?

 Malar said: (Mar 8, 2016) What is meant by trip point and zero crossing?

 Rajiv said: (Apr 16, 2016) Which element is used as the feedback in this circuit?

 Madhavi said: (Aug 20, 2017) Zero point is that point where the output function changes its sign i.e. from negative to positive or vice versa. Trip point electronics means a point on I/p function or variable at which left or right the o/p function changes sign.

 Roxy said: (Feb 27, 2021) A trip point is the value of input voltage that would change the output voltage of a comparator from high to low or low to high. This means that for a zero level detector it needs an input of "0" volts hence "trip point is referenced at zero", so that it can produce change in the output which would indicated that a 0 level voltage is detected.