Observation

It was reported that majority of the candidates did not respond well to the definition in 5(a) as fundamental as it is to the knowledge of amplifier circuits. The Chief Examiner also reported that though very many candidates that attempted 5(b) recalled the formula for inverting Op-Amp circuit, a large percentage of them ignored the negative sign in the numerical computation of gain.

The expected responses were:

(c). Applications of operational amplifier

• Adders

• Comparators

• Integrators

• Differentiators

• Active filters

• Voltage/current converter

• Inverting amplifiers

• Non-inverting amplifiers

• Square-wave generators

• Functions generators