# Voltage Limitter With Op-Amp Comparator

Wednesday, September 25th, 2019 - Electronic Hobby

The basic concept used in this voltage limitter is D1 and D2 are in pairs on a voltage comparator of the Op-Amp. Application circuit of Voltage Limitter With Op-Amp Comparator is often applied to measuring devices such as digital-based analog signal frequency meter or frequency counter. For TTL applications D1 and D2 in series “Voltage Limitter With Op-Amp Comparator” can use a zener diode 5Volt to fit the needs of the TTL system. The series “Voltage Limitter With Op-Amp Comparator” can also be used for microcontroller applications as crrosing zero detector circuit for SCR or triac driver.

### Voltage Limitter With Op-Amp Comparator Circuit In the circuit Voltage Limitter With Op-Amp Comparator magnitude above the level of output (Vo) is limited (limitter) by the value attached to a zener diode, zener diode voltage where the value is Vi and the zener diode voltage drop Vd then apply the following formula.

• At the time down to a level Vo negative then D1 becomes forward biased and D2 be a breakdown, then apply the following equation.

Vo = Vi + Vd1

• At the time of Vo up to a positive level so that D2 becomes forward biased and D1 breakdown, then apply the following equation.

Vo = Vi + Vd2

• So the overall circuit output (Vo) is + (Vi + 0.7) and + (½ + 0.7)

Hopefully this article on “Voltage Limitter With Op-Amp Comparator” a little of this can be an inspiration and useful for visitors.